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Planning Board Packet 02/22/23
REQUEST TO DESIGNATE STORMWATER PERMITTING AUTHORITY UNDER BREWSTER TOWN CODE CHAPTER 272 OWNER: PAUL WALLACE PROPERTY: 162 UNDERPASS ROAD SITE PLAN REVIEW CASE NO. 2023-02 AND MAJOR STORMWATER MANAGEMENT PERMIT CASE NO. 2023-02 OWNER/APPLICANT: PAUSE A WHILE, INC. PROPERTY: 250 UNDERPASS ROAD 1 Town of Brewster 2198 Main Street Brewster, MA 02631-1898 Phone: (508) 896-3701 x. 1133 STAFF REPORT TO: Planning Board FROM: Jon Idman, Town Planner RE: Major Stormwater Permit SWMP23-02 Site Plan Review PB23-02 Applicant, Pause-a-While Inc. Units 1A, 3 & 4, RPB Condominium 250/ 252 Underpass Road (Map 77 Parcels 2-3192 & 2-3194) Commercial (C-H) zoning district DATE: February 14, 2023 ______________________________________________________________________________ Recommendation 1) The stormwater permit application meets the applicable performance standards and submission requirements set out in the town’s Stormwater Management Regulations for issuance and approval of a Major Stormwater Permit. Approval should be granted subject to the continuing obligations set out in said Regulations, including Sections 5.7, 5.8, 5.9 (Certificates of Compliance), Section 7.2 (Inspections), 8.3 (Recording of stormwater permit and O&M plan) and 8.5 therein. 2) Subject to certain Conditions, the site plan review application meets the applicable standards and submission requirements set out in Brewster Zoning Bylaw Section 179-66 Background The applicant is a non-profit educational and human services organization with a focus on addiction recovery support. The organization operated in Orleans until recently when it bought the above- referenced property in December 2022. It will continue to use the property, in part, as the property has been used historically: for general office use. In addition, Pause-a-While will operate its educational programs and meetings at the property. Because this is a proposed new use on the property under the Zoning Bylaw’s Use Table, site plan review is required. Non-profit educational use is permitted in the subject CH district; further such use enjoys a special status under the State Zoning Act, MGL Chapter 40A, Section 3, the so-called “Dover Amendment.” In sum, the Planning Board cannot deny the site plan review or effectively deny the use through site plan review, though it can impose reasonable conditions on bulk or dimensional aspects of the applicant’s proposed use of the property, within the scope of the site plan review standards set out in the Zoning Bylaw. The only site work the applicant proposes with its new ownership and use is to create a new gravel parking field on the property to create 14 new parking spaces. Stormwater facilities are proposed to manage and treat stormwater from the parking field. In addition to site plan review, the site work requires a major stormwater permit because greater than 2,500 sq ft net impervious surface (as defined in the stormwater bylaw and regulations) is proposed. Office of: Planning Board Planning Dept. 2 The property is the subject of prior site plan approval decisions (PB 2012-11 and PB 2016-26). The proposal is consistent with the terms and conditions of those decisions. The applicant underwent informal staff review pursuant to Chapter 83 of the Brewster Code on October 20, 2022. Site Plan Review The applicant’s proposed use and development is consistent with the applicable site plan review standards, as discussed below. Transportation The use is not anticipated to degrade the existing levels of service of surrounding roads and intersections; existing site drives have safe sightlines and no change to site drives is required or proposed; the use is not expected to increase traffic by 20 or more daily trips over the existing permitted conditions. Access Suitable access to the multi-unit/ multi-use condominium property exists from a subdivision road (“Protection Way,” which also serves the post office) that then connects with Underpass Road. No change in access is required or proposed. Parking There is currently permitted a 14 space, paved parking field in the rear portion of the property. The applicant proposes to add a new, on-site, connecting gravel parking field for an additional 14 spaces. The proposed parking meets the dimensional criteria set out in the parking section of the Zoning Bylaw (Article VII) in addition to the standards in the site plan review section. The number of spaces proposed has been suggested by the applicant based on its anticipated demand and is consistent with the Planning Board’s Off-Street Parking Policy dated 9/11/2013. Once the new parking is connected to the existing parking, 26 total site spaces are proposed. Landscaping, design and appearance The existing site is suitably landscaped in accordance with site plan review standards and has been the subject of prior site plan reviews and approvals: the proposed parking field will be located in an existing turf area and no tree removal is proposed. Environmental protection Stormwater management, including construction period erosion control, is the subject of the Major Stormwater Management Permit that is simultaneously pending before the Planning Board for review. By complying with Major Stormwater Permit performance standards, the proposed use and development is also consistent with the relevant site plan review standards for stormwater, including regarding post-development run-off rates. Plants and animals The only proposed exterior or site work, the gravel parking field and stormwater system, is located in previously disturbed areas of the site. The site is not mapped priority habitat under MESA. Lighting One light for the new parking field is proposed to be added to the side of the site accessory building. 3 I recommend as a condition of site approval that the applicant provide the lighting fixture cut/ specifications and mounting height to staff prior to installation so that staff can confirm its compliance with lighting standards in the Zoning Bylaw. Noise Exterior noise levels are not expected to exceed 100 decibels as proposed. Major Stormwater Management Permit This project triggers a Stormwater Permit under Chapter 272 of the Brewster Code (Stormwater Management Bylaw) and according to Section 4 of the Bylaw’s supporting regulations, a Major Stormwater Permit is required because the project involves net new impervious surface of 2500 sq ft or greater (the gravel parking field is considered impervious surface under the Bylaw and Regulations). Because the project is not within wetlands jurisdiction, the Planning Board is the stormwater permitting authority. Major Stormwater Permits are subject to review at a public meeting, including for any waivers requested. The Applicant has provided the required application materials for a Major Stormwater Permits, including a site plan and stormwater management and hydrologic reports, as applicable, and as set out in Appendix B of the Stormwater Management Regulations. Proposed Site Plan entitled Pause-a While Inc., Gravel Parking, 250 Underpass Road, Brewster, MA 02631, prepared and stamped by John M. O’Reilly, PE, PLS, J.M. O’Reilly & Associates, Inc. dated 1/27/23. The Applicant has provided a construction-period BMPs in an erosion and sedimentation control plan consistent with the performance standards for Major Stormwater Permits set out in Section 6.1B of the Stormwater Management Regulations. Plan elements include straw wattles. The Applicant proposes post-construction BMP’s and has provided a corresponding Operations and Maintenance Plan consistent with the performance standards for Major Stormwater Permits for new construction set out in Section 6.2B and section 8.2 of the Stormwater Management Regulations: Run-off from the gravel parking (which itself would provide some infiltration) would be directed to a ‘rip rap’ pre-treatment forebay, then to a vegetated water quality swale for treatment, then infiltrate into a subsurface leaching facility/ infiltration basin. The system meets the applicable standards in the Massachusetts Stormwater Handbook; The stormwater management system was designed under post-development conditions to handle all storms' peak discharges and runoff volume for the 2, 10, 25 and 100-year storm events. As designed, post-development volume and runoff rates are reduced to less than the pre- development conditions including for the 100-year storm; The O&M deals with long term maintenance of all post construction BMPs such as the subsurface recharge system and water quality treatment swale. The system incorporates Low Impact Development-type (LID) stormwater design elements, specifically a water quality treatment swale. In addition to the state stormwater handbook standards, the system meets the treatment requirements (TSS and nutrients) set out in the Regulations. Post-Development Recharge Pre-Development Recharge 1Ex Existing Project Area 1S Gravel Parking Area 1Dis Pre- Dev Peak Discharge 1P One (1) 19.9' x 8.25' x 3' Leach Chamber System 1SW Grassed Swale with Forebay Routing Diagram for 9431.PAUSE-A-WHILE - Dart Prepared by J M O'Reilly & Associates Inc, Printed 1/26/2023 HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Subcat Reach Pond Link 9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 2HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.422 39 >75% Grass cover, Good, HSG A (1Ex, 1S) 0.113 76 Gravel roads, HSG A (1S) 9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 3HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.536 HSG A 1Ex, 1S 0.000 HSG B 0.000 HSG C 0.000 HSG D 0.000 Other 9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 4HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.422 0.000 0.000 0.000 0.000 0.422 >75% Grass cover, Good 1Ex, 1S 0.113 0.000 0.000 0.000 0.000 0.113 Gravel roads 1S Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 5HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Time span=0.00-25.00 hrs, dt=0.01 hrs, 2501 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=11,665 sf 0.00% Impervious Runoff Depth=0.01"Subcatchment 1Ex: Existing Project Area Tc=6.0 min CN=39 Runoff=0.00 cfs 0.000 af Runoff Area=11,665 sf 0.00% Impervious Runoff Depth=0.38"Subcatchment 1S: Gravel Parking Area Tc=6.0 min CN=55 Runoff=0.05 cfs 0.008 af Inflow=0.00 cfs 0.000 afReach 1Dis: Pre- Dev Peak Discharge Outflow=0.00 cfs 0.000 af Peak Elev=62.00' Storage=0 cf Inflow=0.00 cfs 0.000 afPond 1P: One (1) 19.9' x 8.25' x 3' Leach Outflow=0.00 cfs 0.000 af Peak Elev=67.24' Storage=62 cf Inflow=0.05 cfs 0.008 afPond 1SW: Grassed Swale with Forebay Discarded=0.02 cfs 0.008 af Primary=0.00 cfs 0.000 af Outflow=0.02 cfs 0.008 af Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 6HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1Ex: Existing Project Area Runoff = 0.00 cfs @ 21.70 hrs, Volume= 0.000 af, Depth= 0.01" Routed to Reach 1Dis : Pre- Dev Peak Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 2-Year Rainfall=3.60" Area (sf) CN Description 11,665 39 >75% Grass cover, Good, HSG A 11,665 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1Ex: Existing Project Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.001 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0 0 0 Type III 24-hr 2-Year Rainfall=3.60" Runoff Area=11,665 sf Runoff Volume=0.000 af Runoff Depth=0.01" Tc=6.0 min CN=39 0.00 cfs Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 7HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1Ex: Existing Project Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.05 0.00 0.00 2.00 0.07 0.00 0.00 2.50 0.09 0.00 0.00 3.00 0.11 0.00 0.00 3.50 0.13 0.00 0.00 4.00 0.15 0.00 0.00 4.50 0.18 0.00 0.00 5.00 0.20 0.00 0.00 5.50 0.23 0.00 0.00 6.00 0.26 0.00 0.00 6.50 0.29 0.00 0.00 7.00 0.33 0.00 0.00 7.50 0.37 0.00 0.00 8.00 0.41 0.00 0.00 8.50 0.46 0.00 0.00 9.00 0.52 0.00 0.00 9.50 0.60 0.00 0.00 10.00 0.68 0.00 0.00 10.50 0.78 0.00 0.00 11.00 0.90 0.00 0.00 11.50 1.07 0.00 0.00 12.00 1.80 0.00 0.00 12.50 2.53 0.00 0.00 13.00 2.70 0.00 0.00 13.50 2.82 0.00 0.00 14.00 2.92 0.00 0.00 14.50 3.00 0.00 0.00 15.00 3.08 0.00 0.00 15.50 3.14 0.00 0.00 16.00 3.19 0.00 0.00 16.50 3.23 0.00 0.00 17.00 3.27 0.00 0.00 17.50 3.31 0.00 0.00 18.00 3.34 0.00 0.00 18.50 3.37 0.00 0.00 19.00 3.40 0.00 0.00 19.50 3.42 0.01 0.00 20.00 3.45 0.01 0.00 20.50 3.47 0.01 0.00 21.00 3.49 0.01 0.00 21.50 3.51 0.01 0.00 22.00 3.53 0.01 0.00 22.50 3.55 0.01 0.00 23.00 3.57 0.01 0.00 23.50 3.58 0.01 0.00 24.00 3.60 0.01 0.00 24.50 3.60 0.01 0.00 25.00 3.60 0.01 0.00 Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 8HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Gravel Parking Area Runoff = 0.05 cfs @ 12.15 hrs, Volume= 0.008 af, Depth= 0.38" Routed to Pond 1SW : Grassed Swale with Forebay Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 2-Year Rainfall=3.60" Area (sf) CN Description 4,935 76 Gravel roads, HSG A 6,730 39 >75% Grass cover, Good, HSG A 11,665 55 Weighted Average 11,665 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1S: Gravel Parking Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr 2-Year Rainfall=3.60" Runoff Area=11,665 sf Runoff Volume=0.008 af Runoff Depth=0.38" Tc=6.0 min CN=55 0.05 cfs Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 9HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: Gravel Parking Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.05 0.00 0.00 2.00 0.07 0.00 0.00 2.50 0.09 0.00 0.00 3.00 0.11 0.00 0.00 3.50 0.13 0.00 0.00 4.00 0.15 0.00 0.00 4.50 0.18 0.00 0.00 5.00 0.20 0.00 0.00 5.50 0.23 0.00 0.00 6.00 0.26 0.00 0.00 6.50 0.29 0.00 0.00 7.00 0.33 0.00 0.00 7.50 0.37 0.00 0.00 8.00 0.41 0.00 0.00 8.50 0.46 0.00 0.00 9.00 0.52 0.00 0.00 9.50 0.60 0.00 0.00 10.00 0.68 0.00 0.00 10.50 0.78 0.00 0.00 11.00 0.90 0.00 0.00 11.50 1.07 0.00 0.00 12.00 1.80 0.00 0.00 12.50 2.53 0.09 0.03 13.00 2.70 0.12 0.02 13.50 2.82 0.15 0.01 14.00 2.92 0.17 0.01 14.50 3.00 0.20 0.01 15.00 3.08 0.22 0.01 15.50 3.14 0.23 0.01 16.00 3.19 0.25 0.01 16.50 3.23 0.26 0.01 17.00 3.27 0.27 0.01 17.50 3.31 0.28 0.01 18.00 3.34 0.29 0.01 18.50 3.37 0.30 0.00 19.00 3.40 0.31 0.00 19.50 3.42 0.32 0.00 20.00 3.45 0.33 0.00 20.50 3.47 0.34 0.00 21.00 3.49 0.34 0.00 21.50 3.51 0.35 0.00 22.00 3.53 0.36 0.00 22.50 3.55 0.36 0.00 23.00 3.57 0.37 0.00 23.50 3.58 0.37 0.00 24.00 3.60 0.38 0.00 24.50 3.60 0.38 0.00 25.00 3.60 0.38 0.00 Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 10HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 1Dis: Pre- Dev Peak Discharge Inflow Area = 0.268 ac, 0.00% Impervious, Inflow Depth = 0.01" for 2-Year event Inflow = 0.00 cfs @ 21.70 hrs, Volume= 0.000 af Outflow = 0.00 cfs @ 21.70 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 1Dis: Pre- Dev Peak Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.001 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0 0 0 Inflow Area=0.268 ac 0.00 cfs 0.00 cfs Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 11HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 1Dis: Pre- Dev Peak Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.00 0.00 13.00 0.00 0.00 13.50 0.00 0.00 14.00 0.00 0.00 14.50 0.00 0.00 15.00 0.00 0.00 15.50 0.00 0.00 16.00 0.00 0.00 16.50 0.00 0.00 17.00 0.00 0.00 17.50 0.00 0.00 18.00 0.00 0.00 18.50 0.00 0.00 19.00 0.00 0.00 19.50 0.00 0.00 20.00 0.00 0.00 20.50 0.00 0.00 21.00 0.00 0.00 21.50 0.00 0.00 22.00 0.00 0.00 22.50 0.00 0.00 23.00 0.00 0.00 23.50 0.00 0.00 24.00 0.00 0.00 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 12HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Area = 0.268 ac, 0.00% Impervious, Inflow Depth = 0.00" for 2-Year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 62.00' @ 0.00 hrs Surf.Area= 204 sf Storage= 0 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no inflow) Volume Invert Avail.Storage Storage Description #1 62.00' 184 cf 10.25'W x 19.90'L x 3.00'H Prismatoid 612 cf Overall - 203 cf Embedded = 409 cf x 45.0% Voids #2 62.00' 203 cf 4.25'W x 15.90'L x 3.00'H Prismatoid Inside #1 387 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 62.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=62.00' (Free Discharge) 1=Exfiltration ( Controls 0.00 cfs) Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Discarded Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.268 ac Peak Elev=62.00' Storage=0 cf 0.00 cfs 0.00 cfs Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 13HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Discarded Stage-Discharge Discharge (cfs) 0.070.0650.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050 El e v a t i o n ( f e e t ) 65 64 63 62 Exfiltration Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Wetted Storage Stage-Area-Storage Storage (cubic-feet) 350300250200150100500 Surface/Horizontal/Wetted Area (sq-ft) 350300250200150100500 El e v a t i o n ( f e e t ) 65 64 63 62 Prismatoid + Prismatoid Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 14HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Time (hours) Inflow (cfs) Elevation (feet) Discarded (cfs) 0.00 0.00 62.00 0.00 0.50 0.00 62.00 0.00 1.00 0.00 62.00 0.00 1.50 0.00 62.00 0.00 2.00 0.00 62.00 0.00 2.50 0.00 62.00 0.00 3.00 0.00 62.00 0.00 3.50 0.00 62.00 0.00 4.00 0.00 62.00 0.00 4.50 0.00 62.00 0.00 5.00 0.00 62.00 0.00 5.50 0.00 62.00 0.00 6.00 0.00 62.00 0.00 6.50 0.00 62.00 0.00 7.00 0.00 62.00 0.00 7.50 0.00 62.00 0.00 8.00 0.00 62.00 0.00 8.50 0.00 62.00 0.00 9.00 0.00 62.00 0.00 9.50 0.00 62.00 0.00 10.00 0.00 62.00 0.00 10.50 0.00 62.00 0.00 11.00 0.00 62.00 0.00 11.50 0.00 62.00 0.00 12.00 0.00 62.00 0.00 12.50 0.00 62.00 0.00 13.00 0.00 62.00 0.00 13.50 0.00 62.00 0.00 14.00 0.00 62.00 0.00 14.50 0.00 62.00 0.00 15.00 0.00 62.00 0.00 15.50 0.00 62.00 0.00 16.00 0.00 62.00 0.00 16.50 0.00 62.00 0.00 17.00 0.00 62.00 0.00 17.50 0.00 62.00 0.00 18.00 0.00 62.00 0.00 18.50 0.00 62.00 0.00 19.00 0.00 62.00 0.00 19.50 0.00 62.00 0.00 20.00 0.00 62.00 0.00 20.50 0.00 62.00 0.00 21.00 0.00 62.00 0.00 21.50 0.00 62.00 0.00 22.00 0.00 62.00 0.00 22.50 0.00 62.00 0.00 23.00 0.00 62.00 0.00 23.50 0.00 62.00 0.00 24.00 0.00 62.00 0.00 24.50 0.00 62.00 0.00 25.00 0.00 62.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 15HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Discarded (cfs) 62.00 0.00 62.02 0.04 62.04 0.04 62.06 0.04 62.08 0.04 62.10 0.04 62.12 0.04 62.14 0.04 62.16 0.04 62.18 0.04 62.20 0.04 62.22 0.04 62.24 0.04 62.26 0.04 62.28 0.04 62.30 0.04 62.32 0.04 62.34 0.04 62.36 0.04 62.38 0.04 62.40 0.04 62.42 0.04 62.44 0.04 62.46 0.04 62.48 0.04 62.50 0.04 62.52 0.05 62.54 0.05 62.56 0.05 62.58 0.05 62.60 0.05 62.62 0.05 62.64 0.05 62.66 0.05 62.68 0.05 62.70 0.05 62.72 0.05 62.74 0.05 62.76 0.05 62.78 0.05 62.80 0.05 62.82 0.05 62.84 0.05 62.86 0.05 62.88 0.05 62.90 0.05 62.92 0.05 62.94 0.05 62.96 0.05 62.98 0.05 63.00 0.05 63.02 0.05 Elevation (feet) Discarded (cfs) 63.04 0.05 63.06 0.05 63.08 0.05 63.10 0.05 63.12 0.05 63.14 0.05 63.16 0.05 63.18 0.05 63.20 0.05 63.22 0.05 63.24 0.05 63.26 0.05 63.28 0.05 63.30 0.05 63.32 0.05 63.34 0.05 63.36 0.05 63.38 0.05 63.40 0.06 63.42 0.06 63.44 0.06 63.46 0.06 63.48 0.06 63.50 0.06 63.52 0.06 63.54 0.06 63.56 0.06 63.58 0.06 63.60 0.06 63.62 0.06 63.64 0.06 63.66 0.06 63.68 0.06 63.70 0.06 63.72 0.06 63.74 0.06 63.76 0.06 63.78 0.06 63.80 0.06 63.82 0.06 63.84 0.06 63.86 0.06 63.88 0.06 63.90 0.06 63.92 0.06 63.94 0.06 63.96 0.06 63.98 0.06 64.00 0.06 64.02 0.06 64.04 0.06 64.06 0.06 Elevation (feet) Discarded (cfs) 64.08 0.06 64.10 0.06 64.12 0.06 64.14 0.06 64.16 0.06 64.18 0.06 64.20 0.06 64.22 0.06 64.24 0.06 64.26 0.07 64.28 0.07 64.30 0.07 64.32 0.07 64.34 0.07 64.36 0.07 64.38 0.07 64.40 0.07 64.42 0.07 64.44 0.07 64.46 0.07 64.48 0.07 64.50 0.07 64.52 0.07 64.54 0.07 64.56 0.07 64.58 0.07 64.60 0.07 64.62 0.07 64.64 0.07 64.66 0.07 64.68 0.07 64.70 0.07 64.72 0.07 64.74 0.07 64.76 0.07 64.78 0.07 64.80 0.07 64.82 0.07 64.84 0.07 64.86 0.07 64.88 0.07 64.90 0.07 64.92 0.07 64.94 0.07 64.96 0.07 64.98 0.07 65.00 0.07 Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 16HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 62.00 204 0 62.05 207 6 62.10 210 13 62.15 213 19 62.20 216 26 62.25 219 32 62.30 222 39 62.35 225 45 62.40 228 52 62.45 231 58 62.50 234 64 62.55 237 71 62.60 240 77 62.65 243 84 62.70 246 90 62.75 249 97 62.80 252 103 62.85 255 110 62.90 258 116 62.95 261 123 63.00 264 129 63.05 267 135 63.10 270 142 63.15 273 148 63.20 276 155 63.25 279 161 63.30 282 168 63.35 285 174 63.40 288 181 63.45 291 187 63.50 294 193 63.55 297 200 63.60 300 206 63.65 303 213 63.70 306 219 63.75 310 226 63.80 313 232 63.85 316 239 63.90 319 245 63.95 322 251 64.00 325 258 64.05 328 264 64.10 331 271 64.15 334 277 64.20 337 284 64.25 340 290 64.30 343 297 64.35 346 303 64.40 349 309 64.45 352 316 64.50 355 322 64.55 358 329 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 64.60 361 335 64.65 364 342 64.70 367 348 64.75 370 355 64.80 373 361 64.85 376 368 64.90 379 374 64.95 382 380 65.00 385 387 Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 17HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1SW: Grassed Swale with Forebay Inflow Area = 0.268 ac, 0.00% Impervious, Inflow Depth = 0.38" for 2-Year event Inflow = 0.05 cfs @ 12.15 hrs, Volume= 0.008 af Outflow = 0.02 cfs @ 13.05 hrs, Volume= 0.008 af, Atten= 70%, Lag= 54.3 min Discarded = 0.02 cfs @ 13.05 hrs, Volume= 0.008 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Pond 1P : One (1) 19.9' x 8.25' x 3' Leach Chamber System Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 67.24' @ 13.05 hrs Surf.Area= 285 sf Storage= 62 cf Plug-Flow detention time= 32.3 min calculated for 0.008 af (100% of inflow) Center-of-Mass det. time= 32.2 min ( 965.8 - 933.5 ) Volume Invert Avail.Storage Storage Description #1 67.00' 1,733 cf Custom Stage Data (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 67.00 228 57.1 0 0 228 68.00 506 82.2 358 358 515 69.00 684 94.8 593 951 713 70.00 885 107.3 782 1,733 938 Device Routing Invert Outlet Devices #1 Primary 69.00'12.0" Round Culvert L= 10.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 69.00' / 66.00' S= 0.3000 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 0.79 sf #2 Discarded 67.00'2.410 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.02 cfs @ 13.05 hrs HW=67.24' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.02 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=67.00' TW=62.00' (Dynamic Tailwater) 1=Culvert ( Controls 0.00 cfs) Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 18HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale with Forebay Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.268 ac Peak Elev=67.24' Storage=62 cf 0.05 cfs 0.02 cfs 0.02 cfs 0.00 cfs Pond 1SW: Grassed Swale with Forebay Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 70 69 68 67 Exfiltration Culvert Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 19HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale with Forebay Surface Wetted Storage Stage-Area-Storage Storage (cubic-feet) 1,7001,6001,5001,4001,3001,2001,1001,0009008007006005004003002001000 Surface/Horizontal/Wetted Area (sq-ft) 9008007006005004003002001000 El e v a t i o n ( f e e t ) 70 69 68 67 Custom Stage Data Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 20HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1SW: Grassed Swale with Forebay Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 67.00 0.00 0.00 0.00 0.50 0.00 0 67.00 0.00 0.00 0.00 1.00 0.00 0 67.00 0.00 0.00 0.00 1.50 0.00 0 67.00 0.00 0.00 0.00 2.00 0.00 0 67.00 0.00 0.00 0.00 2.50 0.00 0 67.00 0.00 0.00 0.00 3.00 0.00 0 67.00 0.00 0.00 0.00 3.50 0.00 0 67.00 0.00 0.00 0.00 4.00 0.00 0 67.00 0.00 0.00 0.00 4.50 0.00 0 67.00 0.00 0.00 0.00 5.00 0.00 0 67.00 0.00 0.00 0.00 5.50 0.00 0 67.00 0.00 0.00 0.00 6.00 0.00 0 67.00 0.00 0.00 0.00 6.50 0.00 0 67.00 0.00 0.00 0.00 7.00 0.00 0 67.00 0.00 0.00 0.00 7.50 0.00 0 67.00 0.00 0.00 0.00 8.00 0.00 0 67.00 0.00 0.00 0.00 8.50 0.00 0 67.00 0.00 0.00 0.00 9.00 0.00 0 67.00 0.00 0.00 0.00 9.50 0.00 0 67.00 0.00 0.00 0.00 10.00 0.00 0 67.00 0.00 0.00 0.00 10.50 0.00 0 67.00 0.00 0.00 0.00 11.00 0.00 0 67.00 0.00 0.00 0.00 11.50 0.00 0 67.00 0.00 0.00 0.00 12.00 0.00 0 67.00 0.00 0.00 0.00 12.50 0.03 52 67.21 0.02 0.02 0.00 13.00 0.02 62 67.24 0.02 0.02 0.00 13.50 0.01 60 67.24 0.02 0.02 0.00 14.00 0.01 56 67.22 0.02 0.02 0.00 14.50 0.01 49 67.20 0.02 0.02 0.00 15.00 0.01 41 67.17 0.01 0.01 0.00 15.50 0.01 32 67.13 0.01 0.01 0.00 16.00 0.01 22 67.09 0.01 0.01 0.00 16.50 0.01 10 67.04 0.01 0.01 0.00 17.00 0.01 1 67.01 0.01 0.01 0.00 17.50 0.01 1 67.00 0.01 0.01 0.00 18.00 0.01 1 67.00 0.01 0.01 0.00 18.50 0.00 1 67.00 0.00 0.00 0.00 19.00 0.00 1 67.00 0.00 0.00 0.00 19.50 0.00 1 67.00 0.00 0.00 0.00 20.00 0.00 1 67.00 0.00 0.00 0.00 20.50 0.00 1 67.00 0.00 0.00 0.00 21.00 0.00 1 67.00 0.00 0.00 0.00 21.50 0.00 1 67.00 0.00 0.00 0.00 22.00 0.00 1 67.00 0.00 0.00 0.00 22.50 0.00 1 67.00 0.00 0.00 0.00 23.00 0.00 1 67.00 0.00 0.00 0.00 23.50 0.00 1 67.00 0.00 0.00 0.00 24.00 0.00 1 67.00 0.00 0.00 0.00 24.50 0.00 0 67.00 0.00 0.00 0.00 25.00 0.00 0 67.00 0.00 0.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 21HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1SW: Grassed Swale with Forebay Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 67.00 0.00 0.00 0.00 67.05 0.01 0.01 0.00 67.10 0.01 0.01 0.00 67.15 0.01 0.01 0.00 67.20 0.02 0.02 0.00 67.25 0.02 0.02 0.00 67.30 0.02 0.02 0.00 67.35 0.02 0.02 0.00 67.40 0.02 0.02 0.00 67.45 0.02 0.02 0.00 67.50 0.02 0.02 0.00 67.55 0.02 0.02 0.00 67.60 0.02 0.02 0.00 67.65 0.02 0.02 0.00 67.70 0.02 0.02 0.00 67.75 0.02 0.02 0.00 67.80 0.03 0.03 0.00 67.85 0.03 0.03 0.00 67.90 0.03 0.03 0.00 67.95 0.03 0.03 0.00 68.00 0.03 0.03 0.00 68.05 0.03 0.03 0.00 68.10 0.03 0.03 0.00 68.15 0.03 0.03 0.00 68.20 0.03 0.03 0.00 68.25 0.03 0.03 0.00 68.30 0.03 0.03 0.00 68.35 0.03 0.03 0.00 68.40 0.03 0.03 0.00 68.45 0.03 0.03 0.00 68.50 0.03 0.03 0.00 68.55 0.03 0.03 0.00 68.60 0.04 0.04 0.00 68.65 0.04 0.04 0.00 68.70 0.04 0.04 0.00 68.75 0.04 0.04 0.00 68.80 0.04 0.04 0.00 68.85 0.04 0.04 0.00 68.90 0.04 0.04 0.00 68.95 0.04 0.04 0.00 69.00 0.04 0.04 0.00 69.05 0.05 0.04 0.01 69.10 0.08 0.04 0.03 69.15 0.12 0.04 0.08 69.20 0.18 0.04 0.13 69.25 0.25 0.04 0.21 69.30 0.34 0.04 0.29 69.35 0.43 0.04 0.39 69.40 0.54 0.04 0.50 69.45 0.66 0.05 0.62 69.50 0.79 0.05 0.75 69.55 0.93 0.05 0.88 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 69.60 1.07 0.05 1.02 69.65 1.22 0.05 1.17 69.70 1.37 0.05 1.32 69.75 1.52 0.05 1.47 69.80 1.67 0.05 1.62 69.85 1.81 0.05 1.76 69.90 1.95 0.05 1.90 69.95 2.07 0.05 2.02 70.00 2.16 0.05 2.11 Type III 24-hr 2-Year Rainfall=3.60"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 22HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1SW: Grassed Swale with Forebay Elevation (feet) Surface (sq-ft) Wetted (sq-ft) Storage (cubic-feet) 67.00 228 228 0 67.10 251 252 24 67.20 275 277 50 67.30 300 303 79 67.40 326 330 110 67.50 353 358 144 67.60 382 388 181 67.70 411 418 221 67.80 442 449 263 67.90 473 481 309 68.00 506 515 358 68.10 523 533 409 68.20 539 552 462 68.30 557 571 517 68.40 574 591 574 68.50 592 610 632 68.60 610 630 692 68.70 628 651 754 68.80 646 671 818 68.90 665 692 883 69.00 684 713 951 69.10 703 734 1,020 69.20 722 756 1,091 69.30 742 778 1,164 69.40 761 800 1,240 69.50 781 822 1,317 69.60 801 845 1,396 69.70 822 868 1,477 69.80 843 891 1,560 69.90 864 914 1,646 70.00 885 938 1,733 Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 23HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Time span=0.00-25.00 hrs, dt=0.01 hrs, 2501 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=11,665 sf 0.00% Impervious Runoff Depth=0.26"Subcatchment 1Ex: Existing Project Area Tc=6.0 min CN=39 Runoff=0.02 cfs 0.006 af Runoff Area=11,665 sf 0.00% Impervious Runoff Depth=1.13"Subcatchment 1S: Gravel Parking Area Tc=6.0 min CN=55 Runoff=0.30 cfs 0.025 af Inflow=0.02 cfs 0.006 afReach 1Dis: Pre- Dev Peak Discharge Outflow=0.02 cfs 0.006 af Peak Elev=62.00' Storage=0 cf Inflow=0.00 cfs 0.000 afPond 1P: One (1) 19.9' x 8.25' x 3' Leach Outflow=0.00 cfs 0.000 af Peak Elev=68.11' Storage=415 cf Inflow=0.30 cfs 0.025 afPond 1SW: Grassed Swale with Forebay Discarded=0.03 cfs 0.025 af Primary=0.00 cfs 0.000 af Outflow=0.03 cfs 0.025 af Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 24HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1Ex: Existing Project Area Runoff = 0.02 cfs @ 12.43 hrs, Volume= 0.006 af, Depth= 0.26" Routed to Reach 1Dis : Pre- Dev Peak Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 10-Year Rainfall=5.30" Area (sf) CN Description 11,665 39 >75% Grass cover, Good, HSG A 11,665 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1Ex: Existing Project Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.021 0.02 0.019 0.018 0.017 0.016 0.015 0.014 0.013 0.012 0.011 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0 Type III 24-hr 10-Year Rainfall=5.30" Runoff Area=11,665 sf Runoff Volume=0.006 af Runoff Depth=0.26" Tc=6.0 min CN=39 0.02 cfs Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 25HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1Ex: Existing Project Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.05 0.00 0.00 1.50 0.08 0.00 0.00 2.00 0.11 0.00 0.00 2.50 0.13 0.00 0.00 3.00 0.16 0.00 0.00 3.50 0.19 0.00 0.00 4.00 0.23 0.00 0.00 4.50 0.26 0.00 0.00 5.00 0.30 0.00 0.00 5.50 0.34 0.00 0.00 6.00 0.38 0.00 0.00 6.50 0.43 0.00 0.00 7.00 0.48 0.00 0.00 7.50 0.54 0.00 0.00 8.00 0.60 0.00 0.00 8.50 0.68 0.00 0.00 9.00 0.77 0.00 0.00 9.50 0.88 0.00 0.00 10.00 1.00 0.00 0.00 10.50 1.15 0.00 0.00 11.00 1.33 0.00 0.00 11.50 1.58 0.00 0.00 12.00 2.65 0.00 0.00 12.50 3.72 0.02 0.02 13.00 3.97 0.04 0.01 13.50 4.15 0.06 0.01 14.00 4.30 0.08 0.01 14.50 4.42 0.10 0.01 15.00 4.53 0.11 0.01 15.50 4.62 0.13 0.01 16.00 4.70 0.14 0.01 16.50 4.76 0.15 0.01 17.00 4.82 0.17 0.01 17.50 4.87 0.18 0.01 18.00 4.92 0.18 0.00 18.50 4.96 0.19 0.00 19.00 5.00 0.20 0.00 19.50 5.04 0.21 0.00 20.00 5.07 0.21 0.00 20.50 5.11 0.22 0.00 21.00 5.14 0.23 0.00 21.50 5.17 0.24 0.00 22.00 5.20 0.24 0.00 22.50 5.23 0.25 0.00 23.00 5.25 0.25 0.00 23.50 5.28 0.26 0.00 24.00 5.30 0.26 0.00 24.50 5.30 0.26 0.00 25.00 5.30 0.26 0.00 Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 26HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Gravel Parking Area Runoff = 0.30 cfs @ 12.10 hrs, Volume= 0.025 af, Depth= 1.13" Routed to Pond 1SW : Grassed Swale with Forebay Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 10-Year Rainfall=5.30" Area (sf) CN Description 4,935 76 Gravel roads, HSG A 6,730 39 >75% Grass cover, Good, HSG A 11,665 55 Weighted Average 11,665 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1S: Gravel Parking Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 10-Year Rainfall=5.30" Runoff Area=11,665 sf Runoff Volume=0.025 af Runoff Depth=1.13" Tc=6.0 min CN=55 0.30 cfs Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 27HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: Gravel Parking Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.05 0.00 0.00 1.50 0.08 0.00 0.00 2.00 0.11 0.00 0.00 2.50 0.13 0.00 0.00 3.00 0.16 0.00 0.00 3.50 0.19 0.00 0.00 4.00 0.23 0.00 0.00 4.50 0.26 0.00 0.00 5.00 0.30 0.00 0.00 5.50 0.34 0.00 0.00 6.00 0.38 0.00 0.00 6.50 0.43 0.00 0.00 7.00 0.48 0.00 0.00 7.50 0.54 0.00 0.00 8.00 0.60 0.00 0.00 8.50 0.68 0.00 0.00 9.00 0.77 0.00 0.00 9.50 0.88 0.00 0.00 10.00 1.00 0.00 0.00 10.50 1.15 0.00 0.00 11.00 1.33 0.00 0.00 11.50 1.58 0.00 0.00 12.00 2.65 0.11 0.12 12.50 3.72 0.42 0.10 13.00 3.97 0.52 0.05 13.50 4.15 0.59 0.04 14.00 4.30 0.65 0.03 14.50 4.42 0.71 0.03 15.00 4.53 0.75 0.02 15.50 4.62 0.80 0.02 16.00 4.70 0.83 0.02 16.50 4.76 0.86 0.02 17.00 4.82 0.89 0.01 17.50 4.87 0.92 0.01 18.00 4.92 0.94 0.01 18.50 4.96 0.96 0.01 19.00 5.00 0.98 0.01 19.50 5.04 1.00 0.01 20.00 5.07 1.02 0.01 20.50 5.11 1.03 0.01 21.00 5.14 1.05 0.01 21.50 5.17 1.07 0.01 22.00 5.20 1.08 0.01 22.50 5.23 1.09 0.01 23.00 5.25 1.11 0.01 23.50 5.28 1.12 0.01 24.00 5.30 1.13 0.01 24.50 5.30 1.13 0.00 25.00 5.30 1.13 0.00 Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 28HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 1Dis: Pre- Dev Peak Discharge Inflow Area = 0.268 ac, 0.00% Impervious, Inflow Depth = 0.26" for 10-Year event Inflow = 0.02 cfs @ 12.43 hrs, Volume= 0.006 af Outflow = 0.02 cfs @ 12.43 hrs, Volume= 0.006 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 1Dis: Pre- Dev Peak Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.021 0.02 0.019 0.018 0.017 0.016 0.015 0.014 0.013 0.012 0.011 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0 Inflow Area=0.268 ac 0.02 cfs 0.02 cfs Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 29HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 1Dis: Pre- Dev Peak Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.02 0.02 13.00 0.01 0.01 13.50 0.01 0.01 14.00 0.01 0.01 14.50 0.01 0.01 15.00 0.01 0.01 15.50 0.01 0.01 16.00 0.01 0.01 16.50 0.01 0.01 17.00 0.01 0.01 17.50 0.01 0.01 18.00 0.00 0.00 18.50 0.00 0.00 19.00 0.00 0.00 19.50 0.00 0.00 20.00 0.00 0.00 20.50 0.00 0.00 21.00 0.00 0.00 21.50 0.00 0.00 22.00 0.00 0.00 22.50 0.00 0.00 23.00 0.00 0.00 23.50 0.00 0.00 24.00 0.00 0.00 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 30HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Area = 0.268 ac, 0.00% Impervious, Inflow Depth = 0.00" for 10-Year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 62.00' @ 0.00 hrs Surf.Area= 204 sf Storage= 0 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no inflow) Volume Invert Avail.Storage Storage Description #1 62.00' 184 cf 10.25'W x 19.90'L x 3.00'H Prismatoid 612 cf Overall - 203 cf Embedded = 409 cf x 45.0% Voids #2 62.00' 203 cf 4.25'W x 15.90'L x 3.00'H Prismatoid Inside #1 387 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 62.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=62.00' (Free Discharge) 1=Exfiltration ( Controls 0.00 cfs) Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Discarded Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.268 ac Peak Elev=62.00' Storage=0 cf 0.00 cfs 0.00 cfs Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 31HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Discarded Stage-Discharge Discharge (cfs) 0.070.0650.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050 El e v a t i o n ( f e e t ) 65 64 63 62 Exfiltration Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Wetted Storage Stage-Area-Storage Storage (cubic-feet) 350300250200150100500 Surface/Horizontal/Wetted Area (sq-ft) 350300250200150100500 El e v a t i o n ( f e e t ) 65 64 63 62 Prismatoid + Prismatoid Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 32HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Time (hours) Inflow (cfs) Elevation (feet) Discarded (cfs) 0.00 0.00 62.00 0.00 0.50 0.00 62.00 0.00 1.00 0.00 62.00 0.00 1.50 0.00 62.00 0.00 2.00 0.00 62.00 0.00 2.50 0.00 62.00 0.00 3.00 0.00 62.00 0.00 3.50 0.00 62.00 0.00 4.00 0.00 62.00 0.00 4.50 0.00 62.00 0.00 5.00 0.00 62.00 0.00 5.50 0.00 62.00 0.00 6.00 0.00 62.00 0.00 6.50 0.00 62.00 0.00 7.00 0.00 62.00 0.00 7.50 0.00 62.00 0.00 8.00 0.00 62.00 0.00 8.50 0.00 62.00 0.00 9.00 0.00 62.00 0.00 9.50 0.00 62.00 0.00 10.00 0.00 62.00 0.00 10.50 0.00 62.00 0.00 11.00 0.00 62.00 0.00 11.50 0.00 62.00 0.00 12.00 0.00 62.00 0.00 12.50 0.00 62.00 0.00 13.00 0.00 62.00 0.00 13.50 0.00 62.00 0.00 14.00 0.00 62.00 0.00 14.50 0.00 62.00 0.00 15.00 0.00 62.00 0.00 15.50 0.00 62.00 0.00 16.00 0.00 62.00 0.00 16.50 0.00 62.00 0.00 17.00 0.00 62.00 0.00 17.50 0.00 62.00 0.00 18.00 0.00 62.00 0.00 18.50 0.00 62.00 0.00 19.00 0.00 62.00 0.00 19.50 0.00 62.00 0.00 20.00 0.00 62.00 0.00 20.50 0.00 62.00 0.00 21.00 0.00 62.00 0.00 21.50 0.00 62.00 0.00 22.00 0.00 62.00 0.00 22.50 0.00 62.00 0.00 23.00 0.00 62.00 0.00 23.50 0.00 62.00 0.00 24.00 0.00 62.00 0.00 24.50 0.00 62.00 0.00 25.00 0.00 62.00 0.00 Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 33HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Discarded (cfs) 62.00 0.00 62.02 0.04 62.04 0.04 62.06 0.04 62.08 0.04 62.10 0.04 62.12 0.04 62.14 0.04 62.16 0.04 62.18 0.04 62.20 0.04 62.22 0.04 62.24 0.04 62.26 0.04 62.28 0.04 62.30 0.04 62.32 0.04 62.34 0.04 62.36 0.04 62.38 0.04 62.40 0.04 62.42 0.04 62.44 0.04 62.46 0.04 62.48 0.04 62.50 0.04 62.52 0.05 62.54 0.05 62.56 0.05 62.58 0.05 62.60 0.05 62.62 0.05 62.64 0.05 62.66 0.05 62.68 0.05 62.70 0.05 62.72 0.05 62.74 0.05 62.76 0.05 62.78 0.05 62.80 0.05 62.82 0.05 62.84 0.05 62.86 0.05 62.88 0.05 62.90 0.05 62.92 0.05 62.94 0.05 62.96 0.05 62.98 0.05 63.00 0.05 63.02 0.05 Elevation (feet) Discarded (cfs) 63.04 0.05 63.06 0.05 63.08 0.05 63.10 0.05 63.12 0.05 63.14 0.05 63.16 0.05 63.18 0.05 63.20 0.05 63.22 0.05 63.24 0.05 63.26 0.05 63.28 0.05 63.30 0.05 63.32 0.05 63.34 0.05 63.36 0.05 63.38 0.05 63.40 0.06 63.42 0.06 63.44 0.06 63.46 0.06 63.48 0.06 63.50 0.06 63.52 0.06 63.54 0.06 63.56 0.06 63.58 0.06 63.60 0.06 63.62 0.06 63.64 0.06 63.66 0.06 63.68 0.06 63.70 0.06 63.72 0.06 63.74 0.06 63.76 0.06 63.78 0.06 63.80 0.06 63.82 0.06 63.84 0.06 63.86 0.06 63.88 0.06 63.90 0.06 63.92 0.06 63.94 0.06 63.96 0.06 63.98 0.06 64.00 0.06 64.02 0.06 64.04 0.06 64.06 0.06 Elevation (feet) Discarded (cfs) 64.08 0.06 64.10 0.06 64.12 0.06 64.14 0.06 64.16 0.06 64.18 0.06 64.20 0.06 64.22 0.06 64.24 0.06 64.26 0.07 64.28 0.07 64.30 0.07 64.32 0.07 64.34 0.07 64.36 0.07 64.38 0.07 64.40 0.07 64.42 0.07 64.44 0.07 64.46 0.07 64.48 0.07 64.50 0.07 64.52 0.07 64.54 0.07 64.56 0.07 64.58 0.07 64.60 0.07 64.62 0.07 64.64 0.07 64.66 0.07 64.68 0.07 64.70 0.07 64.72 0.07 64.74 0.07 64.76 0.07 64.78 0.07 64.80 0.07 64.82 0.07 64.84 0.07 64.86 0.07 64.88 0.07 64.90 0.07 64.92 0.07 64.94 0.07 64.96 0.07 64.98 0.07 65.00 0.07 Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 34HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 62.00 204 0 62.05 207 6 62.10 210 13 62.15 213 19 62.20 216 26 62.25 219 32 62.30 222 39 62.35 225 45 62.40 228 52 62.45 231 58 62.50 234 64 62.55 237 71 62.60 240 77 62.65 243 84 62.70 246 90 62.75 249 97 62.80 252 103 62.85 255 110 62.90 258 116 62.95 261 123 63.00 264 129 63.05 267 135 63.10 270 142 63.15 273 148 63.20 276 155 63.25 279 161 63.30 282 168 63.35 285 174 63.40 288 181 63.45 291 187 63.50 294 193 63.55 297 200 63.60 300 206 63.65 303 213 63.70 306 219 63.75 310 226 63.80 313 232 63.85 316 239 63.90 319 245 63.95 322 251 64.00 325 258 64.05 328 264 64.10 331 271 64.15 334 277 64.20 337 284 64.25 340 290 64.30 343 297 64.35 346 303 64.40 349 309 64.45 352 316 64.50 355 322 64.55 358 329 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 64.60 361 335 64.65 364 342 64.70 367 348 64.75 370 355 64.80 373 361 64.85 376 368 64.90 379 374 64.95 382 380 65.00 385 387 Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 35HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1SW: Grassed Swale with Forebay Inflow Area = 0.268 ac, 0.00% Impervious, Inflow Depth = 1.13" for 10-Year event Inflow = 0.30 cfs @ 12.10 hrs, Volume= 0.025 af Outflow = 0.03 cfs @ 14.16 hrs, Volume= 0.025 af, Atten= 90%, Lag= 123.4 min Discarded = 0.03 cfs @ 14.16 hrs, Volume= 0.025 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Pond 1P : One (1) 19.9' x 8.25' x 3' Leach Chamber System Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 68.11' @ 14.16 hrs Surf.Area= 524 sf Storage= 415 cf Plug-Flow detention time= 168.4 min calculated for 0.025 af (100% of inflow) Center-of-Mass det. time= 168.4 min ( 1,055.7 - 887.3 ) Volume Invert Avail.Storage Storage Description #1 67.00' 1,733 cf Custom Stage Data (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 67.00 228 57.1 0 0 228 68.00 506 82.2 358 358 515 69.00 684 94.8 593 951 713 70.00 885 107.3 782 1,733 938 Device Routing Invert Outlet Devices #1 Primary 69.00'12.0" Round Culvert L= 10.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 69.00' / 66.00' S= 0.3000 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 0.79 sf #2 Discarded 67.00'2.410 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.03 cfs @ 14.16 hrs HW=68.11' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=67.00' TW=62.00' (Dynamic Tailwater) 1=Culvert ( Controls 0.00 cfs) Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 36HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale with Forebay Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.268 ac Peak Elev=68.11' Storage=415 cf 0.30 cfs 0.03 cfs 0.03 cfs 0.00 cfs Pond 1SW: Grassed Swale with Forebay Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 70 69 68 67 Exfiltration Culvert Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 37HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale with Forebay Surface Wetted Storage Stage-Area-Storage Storage (cubic-feet) 1,7001,6001,5001,4001,3001,2001,1001,0009008007006005004003002001000 Surface/Horizontal/Wetted Area (sq-ft) 9008007006005004003002001000 El e v a t i o n ( f e e t ) 70 69 68 67 Custom Stage Data Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 38HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1SW: Grassed Swale with Forebay Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 67.00 0.00 0.00 0.00 0.50 0.00 0 67.00 0.00 0.00 0.00 1.00 0.00 0 67.00 0.00 0.00 0.00 1.50 0.00 0 67.00 0.00 0.00 0.00 2.00 0.00 0 67.00 0.00 0.00 0.00 2.50 0.00 0 67.00 0.00 0.00 0.00 3.00 0.00 0 67.00 0.00 0.00 0.00 3.50 0.00 0 67.00 0.00 0.00 0.00 4.00 0.00 0 67.00 0.00 0.00 0.00 4.50 0.00 0 67.00 0.00 0.00 0.00 5.00 0.00 0 67.00 0.00 0.00 0.00 5.50 0.00 0 67.00 0.00 0.00 0.00 6.00 0.00 0 67.00 0.00 0.00 0.00 6.50 0.00 0 67.00 0.00 0.00 0.00 7.00 0.00 0 67.00 0.00 0.00 0.00 7.50 0.00 0 67.00 0.00 0.00 0.00 8.00 0.00 0 67.00 0.00 0.00 0.00 8.50 0.00 0 67.00 0.00 0.00 0.00 9.00 0.00 0 67.00 0.00 0.00 0.00 9.50 0.00 0 67.00 0.00 0.00 0.00 10.00 0.00 0 67.00 0.00 0.00 0.00 10.50 0.00 0 67.00 0.00 0.00 0.00 11.00 0.00 0 67.00 0.00 0.00 0.00 11.50 0.00 0 67.00 0.00 0.00 0.00 12.00 0.12 31 67.13 0.01 0.01 0.00 12.50 0.10 330 67.94 0.03 0.03 0.00 13.00 0.05 387 68.06 0.03 0.03 0.00 13.50 0.04 406 68.09 0.03 0.03 0.00 14.00 0.03 414 68.11 0.03 0.03 0.00 14.50 0.03 413 68.11 0.03 0.03 0.00 15.00 0.02 407 68.10 0.03 0.03 0.00 15.50 0.02 396 68.07 0.03 0.03 0.00 16.00 0.02 379 68.04 0.03 0.03 0.00 16.50 0.02 358 68.00 0.03 0.03 0.00 17.00 0.01 335 67.95 0.03 0.03 0.00 17.50 0.01 311 67.90 0.03 0.03 0.00 18.00 0.01 285 67.85 0.03 0.03 0.00 18.50 0.01 260 67.79 0.02 0.02 0.00 19.00 0.01 235 67.73 0.02 0.02 0.00 19.50 0.01 211 67.68 0.02 0.02 0.00 20.00 0.01 188 67.62 0.02 0.02 0.00 20.50 0.01 166 67.56 0.02 0.02 0.00 21.00 0.01 145 67.50 0.02 0.02 0.00 21.50 0.01 125 67.45 0.02 0.02 0.00 22.00 0.01 107 67.39 0.02 0.02 0.00 22.50 0.01 88 67.33 0.02 0.02 0.00 23.00 0.01 71 67.27 0.02 0.02 0.00 23.50 0.01 55 67.22 0.02 0.02 0.00 24.00 0.01 39 67.16 0.01 0.01 0.00 24.50 0.00 16 67.07 0.01 0.01 0.00 25.00 0.00 0 67.00 0.00 0.00 0.00 Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 39HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1SW: Grassed Swale with Forebay Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 67.00 0.00 0.00 0.00 67.05 0.01 0.01 0.00 67.10 0.01 0.01 0.00 67.15 0.01 0.01 0.00 67.20 0.02 0.02 0.00 67.25 0.02 0.02 0.00 67.30 0.02 0.02 0.00 67.35 0.02 0.02 0.00 67.40 0.02 0.02 0.00 67.45 0.02 0.02 0.00 67.50 0.02 0.02 0.00 67.55 0.02 0.02 0.00 67.60 0.02 0.02 0.00 67.65 0.02 0.02 0.00 67.70 0.02 0.02 0.00 67.75 0.02 0.02 0.00 67.80 0.03 0.03 0.00 67.85 0.03 0.03 0.00 67.90 0.03 0.03 0.00 67.95 0.03 0.03 0.00 68.00 0.03 0.03 0.00 68.05 0.03 0.03 0.00 68.10 0.03 0.03 0.00 68.15 0.03 0.03 0.00 68.20 0.03 0.03 0.00 68.25 0.03 0.03 0.00 68.30 0.03 0.03 0.00 68.35 0.03 0.03 0.00 68.40 0.03 0.03 0.00 68.45 0.03 0.03 0.00 68.50 0.03 0.03 0.00 68.55 0.03 0.03 0.00 68.60 0.04 0.04 0.00 68.65 0.04 0.04 0.00 68.70 0.04 0.04 0.00 68.75 0.04 0.04 0.00 68.80 0.04 0.04 0.00 68.85 0.04 0.04 0.00 68.90 0.04 0.04 0.00 68.95 0.04 0.04 0.00 69.00 0.04 0.04 0.00 69.05 0.05 0.04 0.01 69.10 0.08 0.04 0.03 69.15 0.12 0.04 0.08 69.20 0.18 0.04 0.13 69.25 0.25 0.04 0.21 69.30 0.34 0.04 0.29 69.35 0.43 0.04 0.39 69.40 0.54 0.04 0.50 69.45 0.66 0.05 0.62 69.50 0.79 0.05 0.75 69.55 0.93 0.05 0.88 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 69.60 1.07 0.05 1.02 69.65 1.22 0.05 1.17 69.70 1.37 0.05 1.32 69.75 1.52 0.05 1.47 69.80 1.67 0.05 1.62 69.85 1.81 0.05 1.76 69.90 1.95 0.05 1.90 69.95 2.07 0.05 2.02 70.00 2.16 0.05 2.11 Type III 24-hr 10-Year Rainfall=5.30"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 40HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1SW: Grassed Swale with Forebay Elevation (feet) Surface (sq-ft) Wetted (sq-ft) Storage (cubic-feet) 67.00 228 228 0 67.10 251 252 24 67.20 275 277 50 67.30 300 303 79 67.40 326 330 110 67.50 353 358 144 67.60 382 388 181 67.70 411 418 221 67.80 442 449 263 67.90 473 481 309 68.00 506 515 358 68.10 523 533 409 68.20 539 552 462 68.30 557 571 517 68.40 574 591 574 68.50 592 610 632 68.60 610 630 692 68.70 628 651 754 68.80 646 671 818 68.90 665 692 883 69.00 684 713 951 69.10 703 734 1,020 69.20 722 756 1,091 69.30 742 778 1,164 69.40 761 800 1,240 69.50 781 822 1,317 69.60 801 845 1,396 69.70 822 868 1,477 69.80 843 891 1,560 69.90 864 914 1,646 70.00 885 938 1,733 Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 41HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Time span=0.00-25.00 hrs, dt=0.01 hrs, 2501 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=11,665 sf 0.00% Impervious Runoff Depth=0.60"Subcatchment 1Ex: Existing Project Area Tc=6.0 min CN=39 Runoff=0.07 cfs 0.013 af Runoff Area=11,665 sf 0.00% Impervious Runoff Depth=1.81"Subcatchment 1S: Gravel Parking Area Tc=6.0 min CN=55 Runoff=0.52 cfs 0.040 af Inflow=0.07 cfs 0.013 afReach 1Dis: Pre- Dev Peak Discharge Outflow=0.07 cfs 0.013 af Peak Elev=62.00' Storage=0 cf Inflow=0.00 cfs 0.000 afPond 1P: One (1) 19.9' x 8.25' x 3' Leach Outflow=0.00 cfs 0.000 af Peak Elev=68.79' Storage=810 cf Inflow=0.52 cfs 0.040 afPond 1SW: Grassed Swale with Forebay Discarded=0.04 cfs 0.036 af Primary=0.00 cfs 0.000 af Outflow=0.04 cfs 0.036 af Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 42HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1Ex: Existing Project Area Runoff = 0.07 cfs @ 12.30 hrs, Volume= 0.013 af, Depth= 0.60" Routed to Reach 1Dis : Pre- Dev Peak Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 25-Year Rainfall=6.50" Area (sf) CN Description 11,665 39 >75% Grass cover, Good, HSG A 11,665 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1Ex: Existing Project Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr 25-Year Rainfall=6.50" Runoff Area=11,665 sf Runoff Volume=0.013 af Runoff Depth=0.60" Tc=6.0 min CN=39 0.07 cfs Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 43HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1Ex: Existing Project Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.07 0.00 0.00 1.50 0.10 0.00 0.00 2.00 0.13 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.20 0.00 0.00 3.50 0.24 0.00 0.00 4.00 0.28 0.00 0.00 4.50 0.32 0.00 0.00 5.00 0.37 0.00 0.00 5.50 0.42 0.00 0.00 6.00 0.47 0.00 0.00 6.50 0.52 0.00 0.00 7.00 0.59 0.00 0.00 7.50 0.66 0.00 0.00 8.00 0.74 0.00 0.00 8.50 0.83 0.00 0.00 9.00 0.95 0.00 0.00 9.50 1.08 0.00 0.00 10.00 1.23 0.00 0.00 10.50 1.41 0.00 0.00 11.00 1.63 0.00 0.00 11.50 1.94 0.00 0.00 12.00 3.25 0.00 0.00 12.50 4.56 0.12 0.05 13.00 4.87 0.18 0.03 13.50 5.09 0.22 0.02 14.00 5.27 0.26 0.02 14.50 5.42 0.29 0.02 15.00 5.55 0.33 0.02 15.50 5.67 0.35 0.01 16.00 5.76 0.38 0.01 16.50 5.84 0.40 0.01 17.00 5.91 0.42 0.01 17.50 5.98 0.44 0.01 18.00 6.03 0.45 0.01 18.50 6.08 0.47 0.01 19.00 6.13 0.48 0.01 19.50 6.18 0.50 0.01 20.00 6.22 0.51 0.01 20.50 6.26 0.52 0.01 21.00 6.30 0.54 0.01 21.50 6.34 0.55 0.01 22.00 6.37 0.56 0.01 22.50 6.41 0.57 0.01 23.00 6.44 0.58 0.01 23.50 6.47 0.59 0.01 24.00 6.50 0.60 0.00 24.50 6.50 0.60 0.00 25.00 6.50 0.60 0.00 Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 44HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Gravel Parking Area Runoff = 0.52 cfs @ 12.10 hrs, Volume= 0.040 af, Depth= 1.81" Routed to Pond 1SW : Grassed Swale with Forebay Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 25-Year Rainfall=6.50" Area (sf) CN Description 4,935 76 Gravel roads, HSG A 6,730 39 >75% Grass cover, Good, HSG A 11,665 55 Weighted Average 11,665 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1S: Gravel Parking Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 25-Year Rainfall=6.50" Runoff Area=11,665 sf Runoff Volume=0.040 af Runoff Depth=1.81" Tc=6.0 min CN=55 0.52 cfs Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 45HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: Gravel Parking Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.07 0.00 0.00 1.50 0.10 0.00 0.00 2.00 0.13 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.20 0.00 0.00 3.50 0.24 0.00 0.00 4.00 0.28 0.00 0.00 4.50 0.32 0.00 0.00 5.00 0.37 0.00 0.00 5.50 0.42 0.00 0.00 6.00 0.47 0.00 0.00 6.50 0.52 0.00 0.00 7.00 0.59 0.00 0.00 7.50 0.66 0.00 0.00 8.00 0.74 0.00 0.00 8.50 0.83 0.00 0.00 9.00 0.95 0.00 0.00 9.50 1.08 0.00 0.00 10.00 1.23 0.00 0.00 10.50 1.41 0.00 0.00 11.00 1.63 0.00 0.00 11.50 1.94 0.01 0.01 12.00 3.25 0.27 0.25 12.50 4.56 0.77 0.16 13.00 4.87 0.92 0.07 13.50 5.09 1.03 0.06 14.00 5.27 1.12 0.05 14.50 5.42 1.20 0.04 15.00 5.55 1.27 0.04 15.50 5.67 1.33 0.03 16.00 5.76 1.38 0.03 16.50 5.84 1.43 0.02 17.00 5.91 1.47 0.02 17.50 5.98 1.50 0.02 18.00 6.03 1.54 0.02 18.50 6.08 1.57 0.02 19.00 6.13 1.59 0.01 19.50 6.18 1.62 0.01 20.00 6.22 1.65 0.01 20.50 6.26 1.67 0.01 21.00 6.30 1.69 0.01 21.50 6.34 1.72 0.01 22.00 6.37 1.74 0.01 22.50 6.41 1.76 0.01 23.00 6.44 1.78 0.01 23.50 6.47 1.80 0.01 24.00 6.50 1.81 0.01 24.50 6.50 1.81 0.00 25.00 6.50 1.81 0.00 Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 46HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 1Dis: Pre- Dev Peak Discharge Inflow Area = 0.268 ac, 0.00% Impervious, Inflow Depth = 0.60" for 25-Year event Inflow = 0.07 cfs @ 12.30 hrs, Volume= 0.013 af Outflow = 0.07 cfs @ 12.30 hrs, Volume= 0.013 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 1Dis: Pre- Dev Peak Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.268 ac 0.07 cfs 0.07 cfs Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 47HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 1Dis: Pre- Dev Peak Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.05 0.05 13.00 0.03 0.03 13.50 0.02 0.02 14.00 0.02 0.02 14.50 0.02 0.02 15.00 0.02 0.02 15.50 0.01 0.01 16.00 0.01 0.01 16.50 0.01 0.01 17.00 0.01 0.01 17.50 0.01 0.01 18.00 0.01 0.01 18.50 0.01 0.01 19.00 0.01 0.01 19.50 0.01 0.01 20.00 0.01 0.01 20.50 0.01 0.01 21.00 0.01 0.01 21.50 0.01 0.01 22.00 0.01 0.01 22.50 0.01 0.01 23.00 0.01 0.01 23.50 0.01 0.01 24.00 0.00 0.00 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 48HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Area = 0.268 ac, 0.00% Impervious, Inflow Depth = 0.00" for 25-Year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 62.00' @ 0.00 hrs Surf.Area= 204 sf Storage= 0 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no inflow) Volume Invert Avail.Storage Storage Description #1 62.00' 184 cf 10.25'W x 19.90'L x 3.00'H Prismatoid 612 cf Overall - 203 cf Embedded = 409 cf x 45.0% Voids #2 62.00' 203 cf 4.25'W x 15.90'L x 3.00'H Prismatoid Inside #1 387 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 62.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=62.00' (Free Discharge) 1=Exfiltration ( Controls 0.00 cfs) Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Discarded Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.268 ac Peak Elev=62.00' Storage=0 cf 0.00 cfs 0.00 cfs Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 49HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Discarded Stage-Discharge Discharge (cfs) 0.070.0650.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050 El e v a t i o n ( f e e t ) 65 64 63 62 Exfiltration Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Wetted Storage Stage-Area-Storage Storage (cubic-feet) 350300250200150100500 Surface/Horizontal/Wetted Area (sq-ft) 350300250200150100500 El e v a t i o n ( f e e t ) 65 64 63 62 Prismatoid + Prismatoid Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 50HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Time (hours) Inflow (cfs) Elevation (feet) Discarded (cfs) 0.00 0.00 62.00 0.00 0.50 0.00 62.00 0.00 1.00 0.00 62.00 0.00 1.50 0.00 62.00 0.00 2.00 0.00 62.00 0.00 2.50 0.00 62.00 0.00 3.00 0.00 62.00 0.00 3.50 0.00 62.00 0.00 4.00 0.00 62.00 0.00 4.50 0.00 62.00 0.00 5.00 0.00 62.00 0.00 5.50 0.00 62.00 0.00 6.00 0.00 62.00 0.00 6.50 0.00 62.00 0.00 7.00 0.00 62.00 0.00 7.50 0.00 62.00 0.00 8.00 0.00 62.00 0.00 8.50 0.00 62.00 0.00 9.00 0.00 62.00 0.00 9.50 0.00 62.00 0.00 10.00 0.00 62.00 0.00 10.50 0.00 62.00 0.00 11.00 0.00 62.00 0.00 11.50 0.00 62.00 0.00 12.00 0.00 62.00 0.00 12.50 0.00 62.00 0.00 13.00 0.00 62.00 0.00 13.50 0.00 62.00 0.00 14.00 0.00 62.00 0.00 14.50 0.00 62.00 0.00 15.00 0.00 62.00 0.00 15.50 0.00 62.00 0.00 16.00 0.00 62.00 0.00 16.50 0.00 62.00 0.00 17.00 0.00 62.00 0.00 17.50 0.00 62.00 0.00 18.00 0.00 62.00 0.00 18.50 0.00 62.00 0.00 19.00 0.00 62.00 0.00 19.50 0.00 62.00 0.00 20.00 0.00 62.00 0.00 20.50 0.00 62.00 0.00 21.00 0.00 62.00 0.00 21.50 0.00 62.00 0.00 22.00 0.00 62.00 0.00 22.50 0.00 62.00 0.00 23.00 0.00 62.00 0.00 23.50 0.00 62.00 0.00 24.00 0.00 62.00 0.00 24.50 0.00 62.00 0.00 25.00 0.00 62.00 0.00 Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 51HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Discarded (cfs) 62.00 0.00 62.02 0.04 62.04 0.04 62.06 0.04 62.08 0.04 62.10 0.04 62.12 0.04 62.14 0.04 62.16 0.04 62.18 0.04 62.20 0.04 62.22 0.04 62.24 0.04 62.26 0.04 62.28 0.04 62.30 0.04 62.32 0.04 62.34 0.04 62.36 0.04 62.38 0.04 62.40 0.04 62.42 0.04 62.44 0.04 62.46 0.04 62.48 0.04 62.50 0.04 62.52 0.05 62.54 0.05 62.56 0.05 62.58 0.05 62.60 0.05 62.62 0.05 62.64 0.05 62.66 0.05 62.68 0.05 62.70 0.05 62.72 0.05 62.74 0.05 62.76 0.05 62.78 0.05 62.80 0.05 62.82 0.05 62.84 0.05 62.86 0.05 62.88 0.05 62.90 0.05 62.92 0.05 62.94 0.05 62.96 0.05 62.98 0.05 63.00 0.05 63.02 0.05 Elevation (feet) Discarded (cfs) 63.04 0.05 63.06 0.05 63.08 0.05 63.10 0.05 63.12 0.05 63.14 0.05 63.16 0.05 63.18 0.05 63.20 0.05 63.22 0.05 63.24 0.05 63.26 0.05 63.28 0.05 63.30 0.05 63.32 0.05 63.34 0.05 63.36 0.05 63.38 0.05 63.40 0.06 63.42 0.06 63.44 0.06 63.46 0.06 63.48 0.06 63.50 0.06 63.52 0.06 63.54 0.06 63.56 0.06 63.58 0.06 63.60 0.06 63.62 0.06 63.64 0.06 63.66 0.06 63.68 0.06 63.70 0.06 63.72 0.06 63.74 0.06 63.76 0.06 63.78 0.06 63.80 0.06 63.82 0.06 63.84 0.06 63.86 0.06 63.88 0.06 63.90 0.06 63.92 0.06 63.94 0.06 63.96 0.06 63.98 0.06 64.00 0.06 64.02 0.06 64.04 0.06 64.06 0.06 Elevation (feet) Discarded (cfs) 64.08 0.06 64.10 0.06 64.12 0.06 64.14 0.06 64.16 0.06 64.18 0.06 64.20 0.06 64.22 0.06 64.24 0.06 64.26 0.07 64.28 0.07 64.30 0.07 64.32 0.07 64.34 0.07 64.36 0.07 64.38 0.07 64.40 0.07 64.42 0.07 64.44 0.07 64.46 0.07 64.48 0.07 64.50 0.07 64.52 0.07 64.54 0.07 64.56 0.07 64.58 0.07 64.60 0.07 64.62 0.07 64.64 0.07 64.66 0.07 64.68 0.07 64.70 0.07 64.72 0.07 64.74 0.07 64.76 0.07 64.78 0.07 64.80 0.07 64.82 0.07 64.84 0.07 64.86 0.07 64.88 0.07 64.90 0.07 64.92 0.07 64.94 0.07 64.96 0.07 64.98 0.07 65.00 0.07 Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 52HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 62.00 204 0 62.05 207 6 62.10 210 13 62.15 213 19 62.20 216 26 62.25 219 32 62.30 222 39 62.35 225 45 62.40 228 52 62.45 231 58 62.50 234 64 62.55 237 71 62.60 240 77 62.65 243 84 62.70 246 90 62.75 249 97 62.80 252 103 62.85 255 110 62.90 258 116 62.95 261 123 63.00 264 129 63.05 267 135 63.10 270 142 63.15 273 148 63.20 276 155 63.25 279 161 63.30 282 168 63.35 285 174 63.40 288 181 63.45 291 187 63.50 294 193 63.55 297 200 63.60 300 206 63.65 303 213 63.70 306 219 63.75 310 226 63.80 313 232 63.85 316 239 63.90 319 245 63.95 322 251 64.00 325 258 64.05 328 264 64.10 331 271 64.15 334 277 64.20 337 284 64.25 340 290 64.30 343 297 64.35 346 303 64.40 349 309 64.45 352 316 64.50 355 322 64.55 358 329 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 64.60 361 335 64.65 364 342 64.70 367 348 64.75 370 355 64.80 373 361 64.85 376 368 64.90 379 374 64.95 382 380 65.00 385 387 Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 53HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1SW: Grassed Swale with Forebay Inflow Area = 0.268 ac, 0.00% Impervious, Inflow Depth = 1.81" for 25-Year event Inflow = 0.52 cfs @ 12.10 hrs, Volume= 0.040 af Outflow = 0.04 cfs @ 14.93 hrs, Volume= 0.036 af, Atten= 93%, Lag= 169.7 min Discarded = 0.04 cfs @ 14.93 hrs, Volume= 0.036 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Pond 1P : One (1) 19.9' x 8.25' x 3' Leach Chamber System Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 68.79' @ 14.93 hrs Surf.Area= 644 sf Storage= 810 cf Plug-Flow detention time= 263.6 min calculated for 0.036 af (89% of inflow) Center-of-Mass det. time= 209.5 min ( 1,080.7 - 871.2 ) Volume Invert Avail.Storage Storage Description #1 67.00' 1,733 cf Custom Stage Data (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 67.00 228 57.1 0 0 228 68.00 506 82.2 358 358 515 69.00 684 94.8 593 951 713 70.00 885 107.3 782 1,733 938 Device Routing Invert Outlet Devices #1 Primary 69.00'12.0" Round Culvert L= 10.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 69.00' / 66.00' S= 0.3000 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 0.79 sf #2 Discarded 67.00'2.410 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.04 cfs @ 14.93 hrs HW=68.79' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=67.00' TW=62.00' (Dynamic Tailwater) 1=Culvert ( Controls 0.00 cfs) Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 54HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale with Forebay Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.268 ac Peak Elev=68.79' Storage=810 cf 0.52 cfs 0.04 cfs 0.04 cfs 0.00 cfs Pond 1SW: Grassed Swale with Forebay Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 70 69 68 67 Exfiltration Culvert Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 55HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale with Forebay Surface Wetted Storage Stage-Area-Storage Storage (cubic-feet) 1,7001,6001,5001,4001,3001,2001,1001,0009008007006005004003002001000 Surface/Horizontal/Wetted Area (sq-ft) 9008007006005004003002001000 El e v a t i o n ( f e e t ) 70 69 68 67 Custom Stage Data Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 56HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1SW: Grassed Swale with Forebay Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 67.00 0.00 0.00 0.00 0.50 0.00 0 67.00 0.00 0.00 0.00 1.00 0.00 0 67.00 0.00 0.00 0.00 1.50 0.00 0 67.00 0.00 0.00 0.00 2.00 0.00 0 67.00 0.00 0.00 0.00 2.50 0.00 0 67.00 0.00 0.00 0.00 3.00 0.00 0 67.00 0.00 0.00 0.00 3.50 0.00 0 67.00 0.00 0.00 0.00 4.00 0.00 0 67.00 0.00 0.00 0.00 4.50 0.00 0 67.00 0.00 0.00 0.00 5.00 0.00 0 67.00 0.00 0.00 0.00 5.50 0.00 0 67.00 0.00 0.00 0.00 6.00 0.00 0 67.00 0.00 0.00 0.00 6.50 0.00 0 67.00 0.00 0.00 0.00 7.00 0.00 0 67.00 0.00 0.00 0.00 7.50 0.00 0 67.00 0.00 0.00 0.00 8.00 0.00 0 67.00 0.00 0.00 0.00 8.50 0.00 0 67.00 0.00 0.00 0.00 9.00 0.00 0 67.00 0.00 0.00 0.00 9.50 0.00 0 67.00 0.00 0.00 0.00 10.00 0.00 0 67.00 0.00 0.00 0.00 10.50 0.00 0 67.00 0.00 0.00 0.00 11.00 0.00 0 67.00 0.00 0.00 0.00 11.50 0.01 2 67.01 0.01 0.01 0.00 12.00 0.25 103 67.38 0.02 0.02 0.00 12.50 0.16 624 68.49 0.03 0.03 0.00 13.00 0.07 726 68.66 0.04 0.04 0.00 13.50 0.06 770 68.73 0.04 0.04 0.00 14.00 0.05 796 68.77 0.04 0.04 0.00 14.50 0.04 807 68.78 0.04 0.04 0.00 15.00 0.04 810 68.79 0.04 0.04 0.00 15.50 0.03 805 68.78 0.04 0.04 0.00 16.00 0.03 790 68.76 0.04 0.04 0.00 16.50 0.02 769 68.72 0.04 0.04 0.00 17.00 0.02 744 68.68 0.04 0.04 0.00 17.50 0.02 716 68.64 0.04 0.04 0.00 18.00 0.02 684 68.59 0.04 0.04 0.00 18.50 0.02 651 68.53 0.03 0.03 0.00 19.00 0.01 617 68.47 0.03 0.03 0.00 19.50 0.01 583 68.42 0.03 0.03 0.00 20.00 0.01 549 68.36 0.03 0.03 0.00 20.50 0.01 515 68.30 0.03 0.03 0.00 21.00 0.01 481 68.23 0.03 0.03 0.00 21.50 0.01 448 68.17 0.03 0.03 0.00 22.00 0.01 414 68.11 0.03 0.03 0.00 22.50 0.01 381 68.05 0.03 0.03 0.00 23.00 0.01 348 67.98 0.03 0.03 0.00 23.50 0.01 316 67.92 0.03 0.03 0.00 24.00 0.01 286 67.85 0.03 0.03 0.00 24.50 0.00 243 67.75 0.02 0.02 0.00 25.00 0.00 201 67.65 0.02 0.02 0.00 Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 57HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1SW: Grassed Swale with Forebay Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 67.00 0.00 0.00 0.00 67.05 0.01 0.01 0.00 67.10 0.01 0.01 0.00 67.15 0.01 0.01 0.00 67.20 0.02 0.02 0.00 67.25 0.02 0.02 0.00 67.30 0.02 0.02 0.00 67.35 0.02 0.02 0.00 67.40 0.02 0.02 0.00 67.45 0.02 0.02 0.00 67.50 0.02 0.02 0.00 67.55 0.02 0.02 0.00 67.60 0.02 0.02 0.00 67.65 0.02 0.02 0.00 67.70 0.02 0.02 0.00 67.75 0.02 0.02 0.00 67.80 0.03 0.03 0.00 67.85 0.03 0.03 0.00 67.90 0.03 0.03 0.00 67.95 0.03 0.03 0.00 68.00 0.03 0.03 0.00 68.05 0.03 0.03 0.00 68.10 0.03 0.03 0.00 68.15 0.03 0.03 0.00 68.20 0.03 0.03 0.00 68.25 0.03 0.03 0.00 68.30 0.03 0.03 0.00 68.35 0.03 0.03 0.00 68.40 0.03 0.03 0.00 68.45 0.03 0.03 0.00 68.50 0.03 0.03 0.00 68.55 0.03 0.03 0.00 68.60 0.04 0.04 0.00 68.65 0.04 0.04 0.00 68.70 0.04 0.04 0.00 68.75 0.04 0.04 0.00 68.80 0.04 0.04 0.00 68.85 0.04 0.04 0.00 68.90 0.04 0.04 0.00 68.95 0.04 0.04 0.00 69.00 0.04 0.04 0.00 69.05 0.05 0.04 0.01 69.10 0.08 0.04 0.03 69.15 0.12 0.04 0.08 69.20 0.18 0.04 0.13 69.25 0.25 0.04 0.21 69.30 0.34 0.04 0.29 69.35 0.43 0.04 0.39 69.40 0.54 0.04 0.50 69.45 0.66 0.05 0.62 69.50 0.79 0.05 0.75 69.55 0.93 0.05 0.88 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 69.60 1.07 0.05 1.02 69.65 1.22 0.05 1.17 69.70 1.37 0.05 1.32 69.75 1.52 0.05 1.47 69.80 1.67 0.05 1.62 69.85 1.81 0.05 1.76 69.90 1.95 0.05 1.90 69.95 2.07 0.05 2.02 70.00 2.16 0.05 2.11 Type III 24-hr 25-Year Rainfall=6.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 58HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1SW: Grassed Swale with Forebay Elevation (feet) Surface (sq-ft) Wetted (sq-ft) Storage (cubic-feet) 67.00 228 228 0 67.10 251 252 24 67.20 275 277 50 67.30 300 303 79 67.40 326 330 110 67.50 353 358 144 67.60 382 388 181 67.70 411 418 221 67.80 442 449 263 67.90 473 481 309 68.00 506 515 358 68.10 523 533 409 68.20 539 552 462 68.30 557 571 517 68.40 574 591 574 68.50 592 610 632 68.60 610 630 692 68.70 628 651 754 68.80 646 671 818 68.90 665 692 883 69.00 684 713 951 69.10 703 734 1,020 69.20 722 756 1,091 69.30 742 778 1,164 69.40 761 800 1,240 69.50 781 822 1,317 69.60 801 845 1,396 69.70 822 868 1,477 69.80 843 891 1,560 69.90 864 914 1,646 70.00 885 938 1,733 Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 59HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Time span=0.00-25.00 hrs, dt=0.01 hrs, 2501 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=11,665 sf 0.00% Impervious Runoff Depth=1.37"Subcatchment 1Ex: Existing Project Area Tc=6.0 min CN=39 Runoff=0.31 cfs 0.031 af Runoff Area=11,665 sf 0.00% Impervious Runoff Depth=3.13"Subcatchment 1S: Gravel Parking Area Tc=6.0 min CN=55 Runoff=0.95 cfs 0.070 af Inflow=0.31 cfs 0.031 afReach 1Dis: Pre- Dev Peak Discharge Outflow=0.31 cfs 0.031 af Peak Elev=63.99' Storage=256 cf Inflow=0.22 cfs 0.017 afPond 1P: One (1) 19.9' x 8.25' x 3' Leach Outflow=0.06 cfs 0.017 af Peak Elev=69.26' Storage=1,132 cf Inflow=0.95 cfs 0.070 afPond 1SW: Grassed Swale with Forebay Discarded=0.04 cfs 0.042 af Primary=0.22 cfs 0.017 af Outflow=0.26 cfs 0.060 af Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 60HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1Ex: Existing Project Area Runoff = 0.31 cfs @ 12.11 hrs, Volume= 0.031 af, Depth= 1.37" Routed to Reach 1Dis : Pre- Dev Peak Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 100-Year Rainfall=8.50" Area (sf) CN Description 11,665 39 >75% Grass cover, Good, HSG A 11,665 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1Ex: Existing Project Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 100-Year Rainfall=8.50" Runoff Area=11,665 sf Runoff Volume=0.031 af Runoff Depth=1.37" Tc=6.0 min CN=39 0.31 cfs Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 61HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1Ex: Existing Project Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.04 0.00 0.00 1.00 0.08 0.00 0.00 1.50 0.13 0.00 0.00 2.00 0.17 0.00 0.00 2.50 0.21 0.00 0.00 3.00 0.26 0.00 0.00 3.50 0.31 0.00 0.00 4.00 0.37 0.00 0.00 4.50 0.42 0.00 0.00 5.00 0.48 0.00 0.00 5.50 0.55 0.00 0.00 6.00 0.61 0.00 0.00 6.50 0.69 0.00 0.00 7.00 0.77 0.00 0.00 7.50 0.86 0.00 0.00 8.00 0.97 0.00 0.00 8.50 1.09 0.00 0.00 9.00 1.24 0.00 0.00 9.50 1.41 0.00 0.00 10.00 1.61 0.00 0.00 10.50 1.84 0.00 0.00 11.00 2.12 0.00 0.00 11.50 2.53 0.00 0.00 12.00 4.25 0.08 0.09 12.50 5.97 0.44 0.13 13.00 6.37 0.56 0.06 13.50 6.66 0.65 0.05 14.00 6.89 0.73 0.04 14.50 7.09 0.80 0.04 15.00 7.26 0.86 0.03 15.50 7.41 0.92 0.03 16.00 7.53 0.97 0.02 16.50 7.64 1.01 0.02 17.00 7.73 1.05 0.02 17.50 7.81 1.08 0.02 18.00 7.89 1.11 0.02 18.50 7.95 1.14 0.01 19.00 8.02 1.16 0.01 19.50 8.08 1.19 0.01 20.00 8.13 1.21 0.01 20.50 8.19 1.24 0.01 21.00 8.24 1.26 0.01 21.50 8.29 1.28 0.01 22.00 8.34 1.30 0.01 22.50 8.38 1.32 0.01 23.00 8.42 1.34 0.01 23.50 8.46 1.36 0.01 24.00 8.50 1.37 0.01 24.50 8.50 1.37 0.00 25.00 8.50 1.37 0.00 Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 62HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Gravel Parking Area Runoff = 0.95 cfs @ 12.09 hrs, Volume= 0.070 af, Depth= 3.13" Routed to Pond 1SW : Grassed Swale with Forebay Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 100-Year Rainfall=8.50" Area (sf) CN Description 4,935 76 Gravel roads, HSG A 6,730 39 >75% Grass cover, Good, HSG A 11,665 55 Weighted Average 11,665 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1S: Gravel Parking Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Type III 24-hr 100-Year Rainfall=8.50" Runoff Area=11,665 sf Runoff Volume=0.070 af Runoff Depth=3.13" Tc=6.0 min CN=55 0.95 cfs Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 63HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: Gravel Parking Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.04 0.00 0.00 1.00 0.08 0.00 0.00 1.50 0.13 0.00 0.00 2.00 0.17 0.00 0.00 2.50 0.21 0.00 0.00 3.00 0.26 0.00 0.00 3.50 0.31 0.00 0.00 4.00 0.37 0.00 0.00 4.50 0.42 0.00 0.00 5.00 0.48 0.00 0.00 5.50 0.55 0.00 0.00 6.00 0.61 0.00 0.00 6.50 0.69 0.00 0.00 7.00 0.77 0.00 0.00 7.50 0.86 0.00 0.00 8.00 0.97 0.00 0.00 8.50 1.09 0.00 0.00 9.00 1.24 0.00 0.00 9.50 1.41 0.00 0.00 10.00 1.61 0.00 0.00 10.50 1.84 0.00 0.01 11.00 2.12 0.03 0.02 11.50 2.53 0.09 0.04 12.00 4.25 0.63 0.50 12.50 5.97 1.50 0.26 13.00 6.37 1.74 0.11 13.50 6.66 1.91 0.09 14.00 6.89 2.06 0.07 14.50 7.09 2.18 0.06 15.00 7.26 2.29 0.06 15.50 7.41 2.39 0.05 16.00 7.53 2.47 0.04 16.50 7.64 2.54 0.04 17.00 7.73 2.60 0.03 17.50 7.81 2.66 0.03 18.00 7.89 2.71 0.03 18.50 7.95 2.75 0.02 19.00 8.02 2.80 0.02 19.50 8.08 2.84 0.02 20.00 8.13 2.88 0.02 20.50 8.19 2.91 0.02 21.00 8.24 2.95 0.02 21.50 8.29 2.98 0.02 22.00 8.34 3.02 0.02 22.50 8.38 3.05 0.02 23.00 8.42 3.08 0.02 23.50 8.46 3.10 0.01 24.00 8.50 3.13 0.01 24.50 8.50 3.13 0.00 25.00 8.50 3.13 0.00 Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 64HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 1Dis: Pre- Dev Peak Discharge Inflow Area = 0.268 ac, 0.00% Impervious, Inflow Depth = 1.37" for 100-Year event Inflow = 0.31 cfs @ 12.11 hrs, Volume= 0.031 af Outflow = 0.31 cfs @ 12.11 hrs, Volume= 0.031 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 1Dis: Pre- Dev Peak Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.268 ac 0.31 cfs 0.31 cfs Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 65HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 1Dis: Pre- Dev Peak Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.09 0.09 12.50 0.13 0.13 13.00 0.06 0.06 13.50 0.05 0.05 14.00 0.04 0.04 14.50 0.04 0.04 15.00 0.03 0.03 15.50 0.03 0.03 16.00 0.02 0.02 16.50 0.02 0.02 17.00 0.02 0.02 17.50 0.02 0.02 18.00 0.02 0.02 18.50 0.01 0.01 19.00 0.01 0.01 19.50 0.01 0.01 20.00 0.01 0.01 20.50 0.01 0.01 21.00 0.01 0.01 21.50 0.01 0.01 22.00 0.01 0.01 22.50 0.01 0.01 23.00 0.01 0.01 23.50 0.01 0.01 24.00 0.01 0.01 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 66HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Area = 0.268 ac, 0.00% Impervious, Inflow Depth = 0.78" for 100-Year event Inflow = 0.22 cfs @ 12.50 hrs, Volume= 0.017 af Outflow = 0.06 cfs @ 13.36 hrs, Volume= 0.017 af, Atten= 71%, Lag= 51.8 min Discarded = 0.06 cfs @ 13.36 hrs, Volume= 0.017 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 63.99' @ 13.36 hrs Surf.Area= 204 sf Storage= 256 cf Plug-Flow detention time= 49.0 min calculated for 0.017 af (100% of inflow) Center-of-Mass det. time= 49.0 min ( 851.4 - 802.4 ) Volume Invert Avail.Storage Storage Description #1 62.00' 184 cf 10.25'W x 19.90'L x 3.00'H Prismatoid 612 cf Overall - 203 cf Embedded = 409 cf x 45.0% Voids #2 62.00' 203 cf 4.25'W x 15.90'L x 3.00'H Prismatoid Inside #1 387 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 62.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.06 cfs @ 13.36 hrs HW=63.99' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.06 cfs) Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Discarded Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.268 ac Peak Elev=63.99' Storage=256 cf 0.22 cfs 0.06 cfs Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 67HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Discarded Stage-Discharge Discharge (cfs) 0.070.0650.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050 El e v a t i o n ( f e e t ) 65 64 63 62 Exfiltration Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Wetted Storage Stage-Area-Storage Storage (cubic-feet) 350300250200150100500 Surface/Horizontal/Wetted Area (sq-ft) 350300250200150100500 El e v a t i o n ( f e e t ) 65 64 63 62 Prismatoid + Prismatoid Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 68HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 0.00 0.00 0 62.00 0.00 0.50 0.00 0 62.00 0.00 1.00 0.00 0 62.00 0.00 1.50 0.00 0 62.00 0.00 2.00 0.00 0 62.00 0.00 2.50 0.00 0 62.00 0.00 3.00 0.00 0 62.00 0.00 3.50 0.00 0 62.00 0.00 4.00 0.00 0 62.00 0.00 4.50 0.00 0 62.00 0.00 5.00 0.00 0 62.00 0.00 5.50 0.00 0 62.00 0.00 6.00 0.00 0 62.00 0.00 6.50 0.00 0 62.00 0.00 7.00 0.00 0 62.00 0.00 7.50 0.00 0 62.00 0.00 8.00 0.00 0 62.00 0.00 8.50 0.00 0 62.00 0.00 9.00 0.00 0 62.00 0.00 9.50 0.00 0 62.00 0.00 10.00 0.00 0 62.00 0.00 10.50 0.00 0 62.00 0.00 11.00 0.00 0 62.00 0.00 11.50 0.00 0 62.00 0.00 12.00 0.00 0 62.00 0.00 12.50 0.22 78 62.61 0.05 13.00 0.09 239 63.85 0.06 13.50 0.06 255 63.97 0.06 14.00 0.04 231 63.79 0.06 14.50 0.03 189 63.46 0.06 15.00 0.02 138 63.07 0.05 15.50 0.01 82 62.64 0.05 16.00 0.01 24 62.18 0.04 16.50 0.00 0 62.00 0.00 17.00 0.00 0 62.00 0.00 17.50 0.00 0 62.00 0.00 18.00 0.00 0 62.00 0.00 18.50 0.00 0 62.00 0.00 19.00 0.00 0 62.00 0.00 19.50 0.00 0 62.00 0.00 20.00 0.00 0 62.00 0.00 20.50 0.00 0 62.00 0.00 21.00 0.00 0 62.00 0.00 21.50 0.00 0 62.00 0.00 22.00 0.00 0 62.00 0.00 22.50 0.00 0 62.00 0.00 23.00 0.00 0 62.00 0.00 23.50 0.00 0 62.00 0.00 24.00 0.00 0 62.00 0.00 24.50 0.00 0 62.00 0.00 25.00 0.00 0 62.00 0.00 Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 69HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Discarded (cfs) 62.00 0.00 62.02 0.04 62.04 0.04 62.06 0.04 62.08 0.04 62.10 0.04 62.12 0.04 62.14 0.04 62.16 0.04 62.18 0.04 62.20 0.04 62.22 0.04 62.24 0.04 62.26 0.04 62.28 0.04 62.30 0.04 62.32 0.04 62.34 0.04 62.36 0.04 62.38 0.04 62.40 0.04 62.42 0.04 62.44 0.04 62.46 0.04 62.48 0.04 62.50 0.04 62.52 0.05 62.54 0.05 62.56 0.05 62.58 0.05 62.60 0.05 62.62 0.05 62.64 0.05 62.66 0.05 62.68 0.05 62.70 0.05 62.72 0.05 62.74 0.05 62.76 0.05 62.78 0.05 62.80 0.05 62.82 0.05 62.84 0.05 62.86 0.05 62.88 0.05 62.90 0.05 62.92 0.05 62.94 0.05 62.96 0.05 62.98 0.05 63.00 0.05 63.02 0.05 Elevation (feet) Discarded (cfs) 63.04 0.05 63.06 0.05 63.08 0.05 63.10 0.05 63.12 0.05 63.14 0.05 63.16 0.05 63.18 0.05 63.20 0.05 63.22 0.05 63.24 0.05 63.26 0.05 63.28 0.05 63.30 0.05 63.32 0.05 63.34 0.05 63.36 0.05 63.38 0.05 63.40 0.06 63.42 0.06 63.44 0.06 63.46 0.06 63.48 0.06 63.50 0.06 63.52 0.06 63.54 0.06 63.56 0.06 63.58 0.06 63.60 0.06 63.62 0.06 63.64 0.06 63.66 0.06 63.68 0.06 63.70 0.06 63.72 0.06 63.74 0.06 63.76 0.06 63.78 0.06 63.80 0.06 63.82 0.06 63.84 0.06 63.86 0.06 63.88 0.06 63.90 0.06 63.92 0.06 63.94 0.06 63.96 0.06 63.98 0.06 64.00 0.06 64.02 0.06 64.04 0.06 64.06 0.06 Elevation (feet) Discarded (cfs) 64.08 0.06 64.10 0.06 64.12 0.06 64.14 0.06 64.16 0.06 64.18 0.06 64.20 0.06 64.22 0.06 64.24 0.06 64.26 0.07 64.28 0.07 64.30 0.07 64.32 0.07 64.34 0.07 64.36 0.07 64.38 0.07 64.40 0.07 64.42 0.07 64.44 0.07 64.46 0.07 64.48 0.07 64.50 0.07 64.52 0.07 64.54 0.07 64.56 0.07 64.58 0.07 64.60 0.07 64.62 0.07 64.64 0.07 64.66 0.07 64.68 0.07 64.70 0.07 64.72 0.07 64.74 0.07 64.76 0.07 64.78 0.07 64.80 0.07 64.82 0.07 64.84 0.07 64.86 0.07 64.88 0.07 64.90 0.07 64.92 0.07 64.94 0.07 64.96 0.07 64.98 0.07 65.00 0.07 Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 70HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 62.00 204 0 62.05 207 6 62.10 210 13 62.15 213 19 62.20 216 26 62.25 219 32 62.30 222 39 62.35 225 45 62.40 228 52 62.45 231 58 62.50 234 64 62.55 237 71 62.60 240 77 62.65 243 84 62.70 246 90 62.75 249 97 62.80 252 103 62.85 255 110 62.90 258 116 62.95 261 123 63.00 264 129 63.05 267 135 63.10 270 142 63.15 273 148 63.20 276 155 63.25 279 161 63.30 282 168 63.35 285 174 63.40 288 181 63.45 291 187 63.50 294 193 63.55 297 200 63.60 300 206 63.65 303 213 63.70 306 219 63.75 310 226 63.80 313 232 63.85 316 239 63.90 319 245 63.95 322 251 64.00 325 258 64.05 328 264 64.10 331 271 64.15 334 277 64.20 337 284 64.25 340 290 64.30 343 297 64.35 346 303 64.40 349 309 64.45 352 316 64.50 355 322 64.55 358 329 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 64.60 361 335 64.65 364 342 64.70 367 348 64.75 370 355 64.80 373 361 64.85 376 368 64.90 379 374 64.95 382 380 65.00 385 387 Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 71HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1SW: Grassed Swale with Forebay Inflow Area = 0.268 ac, 0.00% Impervious, Inflow Depth = 3.13" for 100-Year event Inflow = 0.95 cfs @ 12.09 hrs, Volume= 0.070 af Outflow = 0.26 cfs @ 12.50 hrs, Volume= 0.060 af, Atten= 73%, Lag= 24.3 min Discarded = 0.04 cfs @ 12.50 hrs, Volume= 0.042 af Primary = 0.22 cfs @ 12.50 hrs, Volume= 0.017 af Routed to Pond 1P : One (1) 19.9' x 8.25' x 3' Leach Chamber System Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 69.26' @ 12.50 hrs Surf.Area= 733 sf Storage= 1,132 cf Plug-Flow detention time= 208.0 min calculated for 0.060 af (85% of inflow) Center-of-Mass det. time= 142.6 min ( 996.8 - 854.1 ) Volume Invert Avail.Storage Storage Description #1 67.00' 1,733 cf Custom Stage Data (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 67.00 228 57.1 0 0 228 68.00 506 82.2 358 358 515 69.00 684 94.8 593 951 713 70.00 885 107.3 782 1,733 938 Device Routing Invert Outlet Devices #1 Primary 69.00'12.0" Round Culvert L= 10.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 69.00' / 66.00' S= 0.3000 '/' Cc= 0.900 n= 0.010 PVC, smooth interior, Flow Area= 0.79 sf #2 Discarded 67.00'2.410 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.04 cfs @ 12.50 hrs HW=69.26' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.22 cfs @ 12.50 hrs HW=69.26' TW=62.61' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.22 cfs @ 1.36 fps) Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 72HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale with Forebay Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.268 ac Peak Elev=69.26' Storage=1,132 cf 0.95 cfs 0.26 cfs 0.04 cfs 0.22 cfs Pond 1SW: Grassed Swale with Forebay Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 70 69 68 67 Exfiltration Culvert Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 73HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale with Forebay Surface Wetted Storage Stage-Area-Storage Storage (cubic-feet) 1,7001,6001,5001,4001,3001,2001,1001,0009008007006005004003002001000 Surface/Horizontal/Wetted Area (sq-ft) 9008007006005004003002001000 El e v a t i o n ( f e e t ) 70 69 68 67 Custom Stage Data Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 74HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1SW: Grassed Swale with Forebay Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 67.00 0.00 0.00 0.00 0.50 0.00 0 67.00 0.00 0.00 0.00 1.00 0.00 0 67.00 0.00 0.00 0.00 1.50 0.00 0 67.00 0.00 0.00 0.00 2.00 0.00 0 67.00 0.00 0.00 0.00 2.50 0.00 0 67.00 0.00 0.00 0.00 3.00 0.00 0 67.00 0.00 0.00 0.00 3.50 0.00 0 67.00 0.00 0.00 0.00 4.00 0.00 0 67.00 0.00 0.00 0.00 4.50 0.00 0 67.00 0.00 0.00 0.00 5.00 0.00 0 67.00 0.00 0.00 0.00 5.50 0.00 0 67.00 0.00 0.00 0.00 6.00 0.00 0 67.00 0.00 0.00 0.00 6.50 0.00 0 67.00 0.00 0.00 0.00 7.00 0.00 0 67.00 0.00 0.00 0.00 7.50 0.00 0 67.00 0.00 0.00 0.00 8.00 0.00 0 67.00 0.00 0.00 0.00 8.50 0.00 0 67.00 0.00 0.00 0.00 9.00 0.00 0 67.00 0.00 0.00 0.00 9.50 0.00 0 67.00 0.00 0.00 0.00 10.00 0.00 0 67.00 0.00 0.00 0.00 10.50 0.01 1 67.00 0.00 0.00 0.00 11.00 0.02 3 67.01 0.01 0.01 0.00 11.50 0.04 28 67.12 0.01 0.01 0.00 12.00 0.50 297 67.87 0.03 0.03 0.00 12.50 0.26 1,132 69.26 0.26 0.04 0.22 13.00 0.11 1,066 69.17 0.13 0.04 0.09 13.50 0.09 1,040 69.13 0.10 0.04 0.06 14.00 0.07 1,026 69.11 0.08 0.04 0.04 14.50 0.06 1,014 69.09 0.07 0.04 0.03 15.00 0.06 1,005 69.08 0.06 0.04 0.02 15.50 0.05 995 69.06 0.06 0.04 0.01 16.00 0.04 983 69.05 0.05 0.04 0.01 16.50 0.04 971 69.03 0.04 0.04 0.00 17.00 0.03 959 69.01 0.04 0.04 0.00 17.50 0.03 943 68.99 0.04 0.04 0.00 18.00 0.03 921 68.96 0.04 0.04 0.00 18.50 0.02 896 68.92 0.04 0.04 0.00 19.00 0.02 868 68.88 0.04 0.04 0.00 19.50 0.02 840 68.83 0.04 0.04 0.00 20.00 0.02 811 68.79 0.04 0.04 0.00 20.50 0.02 781 68.74 0.04 0.04 0.00 21.00 0.02 750 68.69 0.04 0.04 0.00 21.50 0.02 719 68.64 0.04 0.04 0.00 22.00 0.02 687 68.59 0.04 0.04 0.00 22.50 0.02 655 68.54 0.03 0.03 0.00 23.00 0.02 623 68.48 0.03 0.03 0.00 23.50 0.01 590 68.43 0.03 0.03 0.00 24.00 0.01 556 68.37 0.03 0.03 0.00 24.50 0.00 503 68.27 0.03 0.03 0.00 25.00 0.00 447 68.17 0.03 0.03 0.00 Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 75HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1SW: Grassed Swale with Forebay Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 67.00 0.00 0.00 0.00 67.05 0.01 0.01 0.00 67.10 0.01 0.01 0.00 67.15 0.01 0.01 0.00 67.20 0.02 0.02 0.00 67.25 0.02 0.02 0.00 67.30 0.02 0.02 0.00 67.35 0.02 0.02 0.00 67.40 0.02 0.02 0.00 67.45 0.02 0.02 0.00 67.50 0.02 0.02 0.00 67.55 0.02 0.02 0.00 67.60 0.02 0.02 0.00 67.65 0.02 0.02 0.00 67.70 0.02 0.02 0.00 67.75 0.02 0.02 0.00 67.80 0.03 0.03 0.00 67.85 0.03 0.03 0.00 67.90 0.03 0.03 0.00 67.95 0.03 0.03 0.00 68.00 0.03 0.03 0.00 68.05 0.03 0.03 0.00 68.10 0.03 0.03 0.00 68.15 0.03 0.03 0.00 68.20 0.03 0.03 0.00 68.25 0.03 0.03 0.00 68.30 0.03 0.03 0.00 68.35 0.03 0.03 0.00 68.40 0.03 0.03 0.00 68.45 0.03 0.03 0.00 68.50 0.03 0.03 0.00 68.55 0.03 0.03 0.00 68.60 0.04 0.04 0.00 68.65 0.04 0.04 0.00 68.70 0.04 0.04 0.00 68.75 0.04 0.04 0.00 68.80 0.04 0.04 0.00 68.85 0.04 0.04 0.00 68.90 0.04 0.04 0.00 68.95 0.04 0.04 0.00 69.00 0.04 0.04 0.00 69.05 0.05 0.04 0.01 69.10 0.08 0.04 0.03 69.15 0.12 0.04 0.08 69.20 0.18 0.04 0.13 69.25 0.25 0.04 0.21 69.30 0.34 0.04 0.29 69.35 0.43 0.04 0.39 69.40 0.54 0.04 0.50 69.45 0.66 0.05 0.62 69.50 0.79 0.05 0.75 69.55 0.93 0.05 0.88 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 69.60 1.07 0.05 1.02 69.65 1.22 0.05 1.17 69.70 1.37 0.05 1.32 69.75 1.52 0.05 1.47 69.80 1.67 0.05 1.62 69.85 1.81 0.05 1.76 69.90 1.95 0.05 1.90 69.95 2.07 0.05 2.02 70.00 2.16 0.05 2.11 Type III 24-hr 100-Year Rainfall=8.50"9431.PAUSE-A-WHILE - Dart Printed 1/26/2023Prepared by J M O'Reilly & Associates Inc Page 76HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1SW: Grassed Swale with Forebay Elevation (feet) Surface (sq-ft) Wetted (sq-ft) Storage (cubic-feet) 67.00 228 228 0 67.10 251 252 24 67.20 275 277 50 67.30 300 303 79 67.40 326 330 110 67.50 353 358 144 67.60 382 388 181 67.70 411 418 221 67.80 442 449 263 67.90 473 481 309 68.00 506 515 358 68.10 523 533 409 68.20 539 552 462 68.30 557 571 517 68.40 574 591 574 68.50 592 610 632 68.60 610 630 692 68.70 628 651 754 68.80 646 671 818 68.90 665 692 883 69.00 684 713 951 69.10 703 734 1,020 69.20 722 756 1,091 69.30 742 778 1,164 69.40 761 800 1,240 69.50 781 822 1,317 69.60 801 845 1,396 69.70 822 868 1,477 69.80 843 891 1,560 69.90 864 914 1,646 70.00 885 938 1,733 MAJOR STORMWATER MANAGEMENT PERMIT CASE NO. 2023-03 OWNER/APPLICANT: EASTWARD MBT LLC, TRUSTEE, EASTWARD COMPANIES BUSINESS TRUST PROPERTY: 724 LONG POND ROAD 1 Town of Brewster 2198 Main Street Brewster, MA 02631-1898 Phone: (508) 896-3701 x. 1133 STAFF REPORT TO: Planning Board FROM: Jon Idman, Town Planner RE: Major Stormwater Permit SWMP23-03 724 Long Pond Road (Map 75 Parcel 21) Applicant, Eastward Companies DATE: February 15, 2023 ______________________________________________________________________________ Recommendation The stormwater permit application meets the applicable performance standards and submission requirements set out in the town’s Stormwater Management Regulations for issuance and approval of a Major Stormwater Permit. Approval should be granted subject to: the continuing obligations set out in said Regulations, including Sections 5.7, 5.8, 5.9 (Certificates of Compliance), Section 7.2 (Inspections), 8.3 (Recording of stormwater permit and O&M plan) and 8.5 therein; as well as BMPs for swimming pool discharge. Major Stormwater Management Permit This project triggers a Stormwater Permit under Chapter 272 of the Brewster Code (Stormwater Management Bylaw) and according to Section 4 of the Bylaw’s supporting regulations, a Major Stormwater Permit is required because the project involves net new impervious surface of 2500 sq ft or greater. The underlying project is redevelopment of the single-family residential property, including a new swimming pool. The swimming pool will be a salt-water or ozone-type, which requires less chemical treatment and storage than for a chlorine pool. The property slopes southerly away from Long Pond Road. There is a wetland (a former cranberry bog) and wetland buffer zone in the southwest portion of the property. No development or site work is proposed within the wetland or within the 100’ buffer zone to the wetland, except for removal of an existing shed in the buffer zone. The property is not located in a Zone II or the DCPC. Because the development project, including the stormwater management system, is not located within wetlands jurisdiction, the Planning Board is the stormwater permitting authority. Major Stormwater Permits are subject to review at a public meeting, including for any waivers requested. No waivers have been requested or have been identified as necessary in the case. The Applicant has provided the required application materials for a Major Stormwater Permits, including a site plan and stormwater management and hydrologic reports, as applicable, and as set out in Appendix B of the Stormwater Management Regulations. Proposed Site Plan entitled Eastward Companies, 724 Long Pond Road, Brewster, MA 02631, prepared and stamped by John M. O’Reilly, PE, PLS, J.M. O’Reilly & Associates, Inc. dated 1/27/23. The Applicant has provided construction-period BMPs in an erosion and sedimentation control plan consistent with the performance standards for Major Stormwater Permits set out in Section 6.1B of the Office of: Planning Board Planning Dept. 2 Stormwater Management Regulations. Plan elements include straw wattles, including to protect downgradient wetlands resources in vicinity of the proposed development. The Applicant proposes post-construction BMP’s and has provided a corresponding Operations and Maintenance Plan consistent with the performance standards for Major Stormwater Permits for new construction set out in Section 6.2B and Section 8.2 of the Stormwater Management Regulations: Roof run-off and run-off from the pool patio will be collected separately and directed to the subsurface leaching facility for recharge; run-off from the paved driveway in the northeast of the property will be collected and treated in a vegetated swale prior to being conveyed to the subsurface leaching facility for recharge. The system meets the applicable standards in the Massachusetts Stormwater Handbook. The stormwater management system was designed under post-development conditions to handle all storms' peak discharges and runoff volume for the 2, 10, 25 and 100-year storm events. As designed, post-development volume and runoff rates are reduced to less than the pre- development conditions including for the 100-year storm; The O&M deals with long term maintenance of all post construction BMPs such as the subsurface recharge system and water quality treatment swale. The system incorporates Low Impact Development-type (LID) stormwater design elements, specifically a water quality treatment swale. In addition to the state stormwater handbook standards, the system meets the treatment requirements (TSS and nutrients) set out in the Regulations. Chapter 115 of the Brewster Code deals with requirements for swimming pool discharge. Brewster Stormwater Management Permit Application Form Approved 2/23/ 2022 Rev. 06/ 22/2022 Page 2 of 2 5. Type of Application (Check as applicable): Minor Stormwater Permit- Any combination or series of construction or land disturbance activities that, over a two-year period, will result in a net increase in impervious area of 500 sq.ft. to 2,500 sq.ft. and/or will result in land disturbances of 10,000 sq.ft. to 20,000 sq.ft. Major Stormwater Permit- Any alteration, disturbance, development, or redevelopment that does not meet the eligibility criteria for a Minor Stormwater Permit. SWM Permit Amendment- List existing Stormwater Management permit number/ type ____________________. Stormwater Management Certificate of Compliance (SMCC) Request- List relevant Stormwater Management permit number ________________________. 6. Brief Project Description, including any waiver requests: 7. Signatures: Applicant Date Property Owner (if different than Applicant) Date Professional Representative (as applicable) Date NOTES: Please refer to Appendix B of the Stormwater Management Regulations for detailed application submittal and supporting material requirements for Minor and Major Stormwater Management Permits, respectively. The application fee schedule is contained in Appendix C of the Regulations. Certain activities are exempt from review and permitting (See §272-6 of the Stormwater Management Bylaw). If the project is located, in whole or part, within an area subject to state or local wetlands protection law, the review and permitting authority is the Brewster Conservation Commission/ Conservation Department. No permit review shall occur nor shall review periods commence until the application is deemed complete. Post-Development Recharge Pre-Development Recharge 1Ex Existing Project Area 1S Driveway Area with Landscape 2S House Roof Area & Patio 3S Undeveloped Areas 1Dis Pre- Dev Peak Discharge 4R Post-Discharge 1P (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around 1SW Grassed Swale 2P (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around CB1 CB One (1) Solid Catch Basin with Hood CB2 CB Pool Drain and Roof Leaders Routing Diagram for 9348.724 Long Pond Road - EASTWARD HOMES Prepared by J M O'Reilly & Associates Inc, Printed 1/24/2023 HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Subcat Reach Pond Link 9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 2HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.184 39 >75% Grass cover, Good, HSG A (1Ex, 1S, 2S) 0.179 98 Driveway/House/Pool, HSG A (1Ex, 1S) 0.102 98 House Area (2S) 0.044 98 Patio-Pool Area (2S) 0.645 30 Woods, Good, HSG A (1Ex, 2S, 3S) 9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 3HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 1.008 HSG A 1Ex, 1S, 2S, 3S 0.000 HSG B 0.000 HSG C 0.000 HSG D 0.146 Other 2S Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 4HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1Ex: Existing Project Area Runoff = 0.00 cfs @ 15.10 hrs, Volume= 0.003 af, Depth= 0.06" Routed to Reach 1Dis : Pre- Dev Peak Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 2-Year Rainfall=3.60" Area (sf) CN Description * 4,410 98 Driveway/House/Pool, HSG A 2,500 39 >75% Grass cover, Good, HSG A 18,214 30 Woods, Good, HSG A 25,124 43 Weighted Average 20,714 82.45% Pervious Area 4,410 17.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1Ex: Existing Project Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.005 0.005 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0 Type III 24-hr 2-Year Rainfall=3.60" Runoff Area=25,124 sf Runoff Volume=0.003 af Runoff Depth=0.06" Tc=6.0 min CN=43 0.00 cfs Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 5HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1Ex: Existing Project Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.05 0.00 0.00 2.00 0.07 0.00 0.00 2.50 0.09 0.00 0.00 3.00 0.11 0.00 0.00 3.50 0.13 0.00 0.00 4.00 0.15 0.00 0.00 4.50 0.18 0.00 0.00 5.00 0.20 0.00 0.00 5.50 0.23 0.00 0.00 6.00 0.26 0.00 0.00 6.50 0.29 0.00 0.00 7.00 0.33 0.00 0.00 7.50 0.37 0.00 0.00 8.00 0.41 0.00 0.00 8.50 0.46 0.00 0.00 9.00 0.52 0.00 0.00 9.50 0.60 0.00 0.00 10.00 0.68 0.00 0.00 10.50 0.78 0.00 0.00 11.00 0.90 0.00 0.00 11.50 1.07 0.00 0.00 12.00 1.80 0.00 0.00 12.50 2.53 0.00 0.00 13.00 2.70 0.00 0.00 13.50 2.82 0.00 0.00 14.00 2.92 0.01 0.00 14.50 3.00 0.01 0.00 15.00 3.08 0.01 0.00 15.50 3.14 0.02 0.00 16.00 3.19 0.02 0.00 16.50 3.23 0.02 0.00 17.00 3.27 0.03 0.00 17.50 3.31 0.03 0.00 18.00 3.34 0.03 0.00 18.50 3.37 0.04 0.00 19.00 3.40 0.04 0.00 19.50 3.42 0.04 0.00 20.00 3.45 0.04 0.00 20.50 3.47 0.05 0.00 21.00 3.49 0.05 0.00 21.50 3.51 0.05 0.00 22.00 3.53 0.05 0.00 22.50 3.55 0.06 0.00 23.00 3.57 0.06 0.00 23.50 3.58 0.06 0.00 24.00 3.60 0.06 0.00 24.50 3.60 0.06 0.00 25.00 3.60 0.06 0.00 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 6HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Driveway Area with Landscape Runoff = 0.17 cfs @ 12.10 hrs, Volume= 0.013 af, Depth= 1.07" Routed to Pond 1SW : Grassed Swale Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 2-Year Rainfall=3.60" Area (sf) CN Description * 3,400 98 Driveway/House/Pool, HSG A 3,000 39 >75% Grass cover, Good, HSG A 6,400 70 Weighted Average 3,000 46.88% Pervious Area 3,400 53.13% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1S: Driveway Area with Landscape Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type III 24-hr 2-Year Rainfall=3.60" Runoff Area=6,400 sf Runoff Volume=0.013 af Runoff Depth=1.07" Tc=6.0 min CN=70 0.17 cfs Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 7HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: Driveway Area with Landscape Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.05 0.00 0.00 2.00 0.07 0.00 0.00 2.50 0.09 0.00 0.00 3.00 0.11 0.00 0.00 3.50 0.13 0.00 0.00 4.00 0.15 0.00 0.00 4.50 0.18 0.00 0.00 5.00 0.20 0.00 0.00 5.50 0.23 0.00 0.00 6.00 0.26 0.00 0.00 6.50 0.29 0.00 0.00 7.00 0.33 0.00 0.00 7.50 0.37 0.00 0.00 8.00 0.41 0.00 0.00 8.50 0.46 0.00 0.00 9.00 0.52 0.00 0.00 9.50 0.60 0.00 0.00 10.00 0.68 0.00 0.00 10.50 0.78 0.00 0.00 11.00 0.90 0.00 0.00 11.50 1.07 0.01 0.00 12.00 1.80 0.17 0.08 12.50 2.53 0.47 0.05 13.00 2.70 0.55 0.02 13.50 2.82 0.62 0.02 14.00 2.92 0.67 0.01 14.50 3.00 0.72 0.01 15.00 3.08 0.76 0.01 15.50 3.14 0.79 0.01 16.00 3.19 0.82 0.01 16.50 3.23 0.85 0.01 17.00 3.27 0.87 0.01 17.50 3.31 0.89 0.01 18.00 3.34 0.91 0.01 18.50 3.37 0.93 0.00 19.00 3.40 0.94 0.00 19.50 3.42 0.96 0.00 20.00 3.45 0.97 0.00 20.50 3.47 0.99 0.00 21.00 3.49 1.00 0.00 21.50 3.51 1.01 0.00 22.00 3.53 1.03 0.00 22.50 3.55 1.04 0.00 23.00 3.57 1.05 0.00 23.50 3.58 1.06 0.00 24.00 3.60 1.07 0.00 24.50 3.60 1.07 0.00 25.00 3.60 1.07 0.00 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 8HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: House Roof Area & Patio Runoff = 0.33 cfs @ 12.10 hrs, Volume= 0.025 af, Depth= 1.19" Routed to Pond CB2 : Pool Drain and Roof Leaders Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 2-Year Rainfall=3.60" Area (sf) CN Description * 4,443 98 House Area * 1,900 98 Patio-Pool Area 2,500 39 >75% Grass cover, Good, HSG A 2,000 30 Woods, Good, HSG A 10,843 72 Weighted Average 4,500 41.50% Pervious Area 6,343 58.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 2S: House Roof Area & Patio Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 2-Year Rainfall=3.60" Runoff Area=10,843 sf Runoff Volume=0.025 af Runoff Depth=1.19" Tc=6.0 min CN=72 0.33 cfs Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 9HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: House Roof Area & Patio Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.05 0.00 0.00 2.00 0.07 0.00 0.00 2.50 0.09 0.00 0.00 3.00 0.11 0.00 0.00 3.50 0.13 0.00 0.00 4.00 0.15 0.00 0.00 4.50 0.18 0.00 0.00 5.00 0.20 0.00 0.00 5.50 0.23 0.00 0.00 6.00 0.26 0.00 0.00 6.50 0.29 0.00 0.00 7.00 0.33 0.00 0.00 7.50 0.37 0.00 0.00 8.00 0.41 0.00 0.00 8.50 0.46 0.00 0.00 9.00 0.52 0.00 0.00 9.50 0.60 0.00 0.00 10.00 0.68 0.00 0.00 10.50 0.78 0.00 0.00 11.00 0.90 0.00 0.00 11.50 1.07 0.02 0.01 12.00 1.80 0.21 0.17 12.50 2.53 0.54 0.09 13.00 2.70 0.64 0.04 13.50 2.82 0.70 0.03 14.00 2.92 0.76 0.03 14.50 3.00 0.81 0.02 15.00 3.08 0.85 0.02 15.50 3.14 0.89 0.02 16.00 3.19 0.92 0.02 16.50 3.23 0.95 0.01 17.00 3.27 0.98 0.01 17.50 3.31 1.00 0.01 18.00 3.34 1.02 0.01 18.50 3.37 1.04 0.01 19.00 3.40 1.05 0.01 19.50 3.42 1.07 0.01 20.00 3.45 1.09 0.01 20.50 3.47 1.10 0.01 21.00 3.49 1.11 0.01 21.50 3.51 1.13 0.01 22.00 3.53 1.14 0.01 22.50 3.55 1.15 0.01 23.00 3.57 1.17 0.01 23.50 3.58 1.18 0.01 24.00 3.60 1.19 0.01 24.50 3.60 1.19 0.00 25.00 3.60 1.19 0.00 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 10HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Undeveloped Areas [45] Hint: Runoff=Zero Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Routed to Reach 4R : Post-Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 2-Year Rainfall=3.60" Area (sf) CN Description 7,881 30 Woods, Good, HSG A 7,881 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 3S: Undeveloped Areas Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Type III 24-hr 2-Year Rainfall=3.60" Runoff Area=7,881 sf Runoff Volume=0.000 af Runoff Depth=0.00" Tc=6.0 min CN=30 0.00 cfs Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 11HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: Undeveloped Areas Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.05 0.00 0.00 2.00 0.07 0.00 0.00 2.50 0.09 0.00 0.00 3.00 0.11 0.00 0.00 3.50 0.13 0.00 0.00 4.00 0.15 0.00 0.00 4.50 0.18 0.00 0.00 5.00 0.20 0.00 0.00 5.50 0.23 0.00 0.00 6.00 0.26 0.00 0.00 6.50 0.29 0.00 0.00 7.00 0.33 0.00 0.00 7.50 0.37 0.00 0.00 8.00 0.41 0.00 0.00 8.50 0.46 0.00 0.00 9.00 0.52 0.00 0.00 9.50 0.60 0.00 0.00 10.00 0.68 0.00 0.00 10.50 0.78 0.00 0.00 11.00 0.90 0.00 0.00 11.50 1.07 0.00 0.00 12.00 1.80 0.00 0.00 12.50 2.53 0.00 0.00 13.00 2.70 0.00 0.00 13.50 2.82 0.00 0.00 14.00 2.92 0.00 0.00 14.50 3.00 0.00 0.00 15.00 3.08 0.00 0.00 15.50 3.14 0.00 0.00 16.00 3.19 0.00 0.00 16.50 3.23 0.00 0.00 17.00 3.27 0.00 0.00 17.50 3.31 0.00 0.00 18.00 3.34 0.00 0.00 18.50 3.37 0.00 0.00 19.00 3.40 0.00 0.00 19.50 3.42 0.00 0.00 20.00 3.45 0.00 0.00 20.50 3.47 0.00 0.00 21.00 3.49 0.00 0.00 21.50 3.51 0.00 0.00 22.00 3.53 0.00 0.00 22.50 3.55 0.00 0.00 23.00 3.57 0.00 0.00 23.50 3.58 0.00 0.00 24.00 3.60 0.00 0.00 24.50 3.60 0.00 0.00 25.00 3.60 0.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 12HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 1Dis: Pre- Dev Peak Discharge [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.577 ac, 17.55% Impervious, Inflow Depth = 0.06" for 2-Year event Inflow = 0.00 cfs @ 15.10 hrs, Volume= 0.003 af Outflow = 0.00 cfs @ 15.10 hrs, Volume= 0.003 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 1Dis: Pre- Dev Peak Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.005 0.005 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0 Inflow Area=0.577 ac 0.00 cfs 0.00 cfs Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 13HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 1Dis: Pre- Dev Peak Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.00 0.00 13.00 0.00 0.00 13.50 0.00 0.00 14.00 0.00 0.00 14.50 0.00 0.00 15.00 0.00 0.00 15.50 0.00 0.00 16.00 0.00 0.00 16.50 0.00 0.00 17.00 0.00 0.00 17.50 0.00 0.00 18.00 0.00 0.00 18.50 0.00 0.00 19.00 0.00 0.00 19.50 0.00 0.00 20.00 0.00 0.00 20.50 0.00 0.00 21.00 0.00 0.00 21.50 0.00 0.00 22.00 0.00 0.00 22.50 0.00 0.00 23.00 0.00 0.00 23.50 0.00 0.00 24.00 0.00 0.00 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 14HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 4R: Post-Discharge [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.577 ac, 38.78% Impervious, Inflow Depth = 0.00" for 2-Year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 4R: Post-Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.577 ac 0.00 cfs 0.00 cfs Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 15HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: Post-Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.00 0.00 13.00 0.00 0.00 13.50 0.00 0.00 14.00 0.00 0.00 14.50 0.00 0.00 15.00 0.00 0.00 15.50 0.00 0.00 16.00 0.00 0.00 16.50 0.00 0.00 17.00 0.00 0.00 17.50 0.00 0.00 18.00 0.00 0.00 18.50 0.00 0.00 19.00 0.00 0.00 19.50 0.00 0.00 20.00 0.00 0.00 20.50 0.00 0.00 21.00 0.00 0.00 21.50 0.00 0.00 22.00 0.00 0.00 22.50 0.00 0.00 23.00 0.00 0.00 23.50 0.00 0.00 24.00 0.00 0.00 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 16HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Inflow Area = 0.147 ac, 53.13% Impervious, Inflow Depth = 0.00" for 2-Year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach 4R : Post-Discharge Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 99.00' @ 0.00 hrs Surf.Area= 154 sf Storage= 0 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no inflow) Volume Invert Avail.Storage Storage Description #1 99.00' 170 cf 6.00'D x 6.00'H Vertical Cone/Cylinder Inside #2 199 cf Overall - 3.0" Wall Thickness = 170 cf #2 99.00' 326 cf 14.00'D x 6.00'H Vertical Cone/Cylinder 924 cf Overall - 199 cf Embedded = 725 cf x 45.0% Voids 496 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 99.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 104.80'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=99.00' (Free Discharge) 1=Exfiltration ( Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=99.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 17HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.147 ac Peak Elev=99.00' Storage=0 cf 0.00 cfs 0.00 cfs 0.00 cfs 0.00 cfs Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Exfiltration Broad-Crested Rectangular Weir Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 18HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Wetted Storage Stage-Area-Storage Storage (cubic-feet) 450400350300250200150100500 Surface/Horizontal/Wetted Area (sq-ft) 400350300250200150100500 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Vertical Cone/Cylinder + Vertical Cone/Cylinder Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 19HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 99.00 0.00 0.00 0.00 0.50 0.00 99.00 0.00 0.00 0.00 1.00 0.00 99.00 0.00 0.00 0.00 1.50 0.00 99.00 0.00 0.00 0.00 2.00 0.00 99.00 0.00 0.00 0.00 2.50 0.00 99.00 0.00 0.00 0.00 3.00 0.00 99.00 0.00 0.00 0.00 3.50 0.00 99.00 0.00 0.00 0.00 4.00 0.00 99.00 0.00 0.00 0.00 4.50 0.00 99.00 0.00 0.00 0.00 5.00 0.00 99.00 0.00 0.00 0.00 5.50 0.00 99.00 0.00 0.00 0.00 6.00 0.00 99.00 0.00 0.00 0.00 6.50 0.00 99.00 0.00 0.00 0.00 7.00 0.00 99.00 0.00 0.00 0.00 7.50 0.00 99.00 0.00 0.00 0.00 8.00 0.00 99.00 0.00 0.00 0.00 8.50 0.00 99.00 0.00 0.00 0.00 9.00 0.00 99.00 0.00 0.00 0.00 9.50 0.00 99.00 0.00 0.00 0.00 10.00 0.00 99.00 0.00 0.00 0.00 10.50 0.00 99.00 0.00 0.00 0.00 11.00 0.00 99.00 0.00 0.00 0.00 11.50 0.00 99.00 0.00 0.00 0.00 12.00 0.00 99.00 0.00 0.00 0.00 12.50 0.00 99.00 0.00 0.00 0.00 13.00 0.00 99.00 0.00 0.00 0.00 13.50 0.00 99.00 0.00 0.00 0.00 14.00 0.00 99.00 0.00 0.00 0.00 14.50 0.00 99.00 0.00 0.00 0.00 15.00 0.00 99.00 0.00 0.00 0.00 15.50 0.00 99.00 0.00 0.00 0.00 16.00 0.00 99.00 0.00 0.00 0.00 16.50 0.00 99.00 0.00 0.00 0.00 17.00 0.00 99.00 0.00 0.00 0.00 17.50 0.00 99.00 0.00 0.00 0.00 18.00 0.00 99.00 0.00 0.00 0.00 18.50 0.00 99.00 0.00 0.00 0.00 19.00 0.00 99.00 0.00 0.00 0.00 19.50 0.00 99.00 0.00 0.00 0.00 20.00 0.00 99.00 0.00 0.00 0.00 20.50 0.00 99.00 0.00 0.00 0.00 21.00 0.00 99.00 0.00 0.00 0.00 21.50 0.00 99.00 0.00 0.00 0.00 22.00 0.00 99.00 0.00 0.00 0.00 22.50 0.00 99.00 0.00 0.00 0.00 23.00 0.00 99.00 0.00 0.00 0.00 23.50 0.00 99.00 0.00 0.00 0.00 24.00 0.00 99.00 0.00 0.00 0.00 24.50 0.00 99.00 0.00 0.00 0.00 25.00 0.00 99.00 0.00 0.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 20HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 99.00 0.00 0.00 0.00 99.10 0.03 0.03 0.00 99.20 0.03 0.03 0.00 99.30 0.03 0.03 0.00 99.40 0.03 0.03 0.00 99.50 0.03 0.03 0.00 99.60 0.03 0.03 0.00 99.70 0.04 0.04 0.00 99.80 0.04 0.04 0.00 99.90 0.04 0.04 0.00 100.00 0.04 0.04 0.00 100.10 0.04 0.04 0.00 100.20 0.04 0.04 0.00 100.30 0.04 0.04 0.00 100.40 0.04 0.04 0.00 100.50 0.04 0.04 0.00 100.60 0.04 0.04 0.00 100.70 0.04 0.04 0.00 100.80 0.04 0.04 0.00 100.90 0.05 0.05 0.00 101.00 0.05 0.05 0.00 101.10 0.05 0.05 0.00 101.20 0.05 0.05 0.00 101.30 0.05 0.05 0.00 101.40 0.05 0.05 0.00 101.50 0.05 0.05 0.00 101.60 0.05 0.05 0.00 101.70 0.05 0.05 0.00 101.80 0.05 0.05 0.00 101.90 0.05 0.05 0.00 102.00 0.05 0.05 0.00 102.10 0.06 0.06 0.00 102.20 0.06 0.06 0.00 102.30 0.06 0.06 0.00 102.40 0.06 0.06 0.00 102.50 0.06 0.06 0.00 102.60 0.06 0.06 0.00 102.70 0.06 0.06 0.00 102.80 0.06 0.06 0.00 102.90 0.06 0.06 0.00 103.00 0.06 0.06 0.00 103.10 0.06 0.06 0.00 103.20 0.06 0.06 0.00 103.30 0.07 0.07 0.00 103.40 0.07 0.07 0.00 103.50 0.07 0.07 0.00 103.60 0.07 0.07 0.00 103.70 0.07 0.07 0.00 103.80 0.07 0.07 0.00 103.90 0.07 0.07 0.00 104.00 0.07 0.07 0.00 104.10 0.07 0.07 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 104.20 0.07 0.07 0.00 104.30 0.07 0.07 0.00 104.40 0.07 0.07 0.00 104.50 0.08 0.08 0.00 104.60 0.08 0.08 0.00 104.70 0.08 0.08 0.00 104.80 0.08 0.08 0.00 104.90 1.07 0.08 0.99 105.00 2.87 0.08 2.79 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 21HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 99.00 154 0 99.10 158 8 99.20 163 17 99.30 167 25 99.40 172 33 99.50 176 41 99.60 180 50 99.70 185 58 99.80 189 66 99.90 194 74 100.00 198 83 100.10 202 91 100.20 207 99 100.30 211 107 100.40 216 116 100.50 220 124 100.60 224 132 100.70 229 140 100.80 233 149 100.90 238 157 101.00 242 165 101.10 246 173 101.20 251 182 101.30 255 190 101.40 259 198 101.50 264 207 101.60 268 215 101.70 273 223 101.80 277 231 101.90 281 240 102.00 286 248 102.10 290 256 102.20 295 264 102.30 299 273 102.40 303 281 102.50 308 289 102.60 312 297 102.70 317 306 102.80 321 314 102.90 325 322 103.00 330 330 103.10 334 339 103.20 339 347 103.30 343 355 103.40 347 364 103.50 352 372 103.60 356 380 103.70 361 388 103.80 365 397 103.90 369 405 104.00 374 413 104.10 378 421 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 104.20 383 430 104.30 387 438 104.40 391 446 104.50 396 454 104.60 400 463 104.70 405 471 104.80 409 479 104.90 413 487 105.00 418 496 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 22HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1SW: Grassed Swale Inflow Area = 0.147 ac, 53.13% Impervious, Inflow Depth = 1.07" for 2-Year event Inflow = 0.17 cfs @ 12.10 hrs, Volume= 0.013 af Outflow = 0.02 cfs @ 13.02 hrs, Volume= 0.013 af, Atten= 87%, Lag= 55.4 min Discarded = 0.02 cfs @ 13.02 hrs, Volume= 0.013 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Pond CB1 : One (1) Solid Catch Basin with Hood Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 106.59' @ 13.02 hrs Surf.Area= 385 sf Storage= 192 cf Plug-Flow detention time= 86.2 min calculated for 0.013 af (100% of inflow) Center-of-Mass det. time= 86.2 min ( 953.5 - 867.4 ) Volume Invert Avail.Storage Storage Description #1 106.00' 974 cf Custom Stage Data (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 106.00 267 61.0 0 0 267 107.00 478 79.0 367 367 479 107.50 605 89.0 270 638 620 108.00 745 98.0 337 974 761 Device Routing Invert Outlet Devices #1 Discarded 106.00'2.410 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 107.50'24.0" x 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.02 cfs @ 13.02 hrs HW=106.59' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.02 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=106.00' TW=105.50' (Dynamic Tailwater) 2=Orifice/Grate ( Controls 0.00 cfs) Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 23HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.147 ac Peak Elev=106.59' Storage=192 cf 0.17 cfs 0.02 cfs 0.02 cfs 0.00 cfs Pond 1SW: Grassed Swale Total Discarded Primary Stage-Discharge Discharge (cfs) 9876543210 El e v a t i o n ( f e e t ) 108 107 106 Exfiltration Orifice/Grate Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 24HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale Surface Wetted Storage Stage-Area-Storage Storage (cubic-feet) 9008007006005004003002001000 Surface/Horizontal/Wetted Area (sq-ft) 7006005004003002001000 El e v a t i o n ( f e e t ) 108 107 106 Custom Stage Data Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 25HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1SW: Grassed Swale Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 106.00 0.00 0.00 0.00 0.50 0.00 0 106.00 0.00 0.00 0.00 1.00 0.00 0 106.00 0.00 0.00 0.00 1.50 0.00 0 106.00 0.00 0.00 0.00 2.00 0.00 0 106.00 0.00 0.00 0.00 2.50 0.00 0 106.00 0.00 0.00 0.00 3.00 0.00 0 106.00 0.00 0.00 0.00 3.50 0.00 0 106.00 0.00 0.00 0.00 4.00 0.00 0 106.00 0.00 0.00 0.00 4.50 0.00 0 106.00 0.00 0.00 0.00 5.00 0.00 0 106.00 0.00 0.00 0.00 5.50 0.00 0 106.00 0.00 0.00 0.00 6.00 0.00 0 106.00 0.00 0.00 0.00 6.50 0.00 0 106.00 0.00 0.00 0.00 7.00 0.00 0 106.00 0.00 0.00 0.00 7.50 0.00 0 106.00 0.00 0.00 0.00 8.00 0.00 0 106.00 0.00 0.00 0.00 8.50 0.00 0 106.00 0.00 0.00 0.00 9.00 0.00 0 106.00 0.00 0.00 0.00 9.50 0.00 0 106.00 0.00 0.00 0.00 10.00 0.00 0 106.00 0.00 0.00 0.00 10.50 0.00 0 106.00 0.00 0.00 0.00 11.00 0.00 0 106.00 0.00 0.00 0.00 11.50 0.00 1 106.00 0.00 0.00 0.00 12.00 0.08 25 106.09 0.02 0.02 0.00 12.50 0.05 178 106.55 0.02 0.02 0.00 13.00 0.02 192 106.59 0.02 0.02 0.00 13.50 0.02 188 106.58 0.02 0.02 0.00 14.00 0.01 179 106.56 0.02 0.02 0.00 14.50 0.01 166 106.52 0.02 0.02 0.00 15.00 0.01 152 106.48 0.02 0.02 0.00 15.50 0.01 135 106.44 0.02 0.02 0.00 16.00 0.01 117 106.38 0.02 0.02 0.00 16.50 0.01 97 106.33 0.02 0.02 0.00 17.00 0.01 77 106.27 0.02 0.02 0.00 17.50 0.01 58 106.20 0.02 0.02 0.00 18.00 0.01 38 106.13 0.02 0.02 0.00 18.50 0.00 18 106.07 0.02 0.02 0.00 19.00 0.00 1 106.00 0.01 0.01 0.00 19.50 0.00 1 106.00 0.00 0.00 0.00 20.00 0.00 1 106.00 0.00 0.00 0.00 20.50 0.00 1 106.00 0.00 0.00 0.00 21.00 0.00 1 106.00 0.00 0.00 0.00 21.50 0.00 1 106.00 0.00 0.00 0.00 22.00 0.00 1 106.00 0.00 0.00 0.00 22.50 0.00 1 106.00 0.00 0.00 0.00 23.00 0.00 1 106.00 0.00 0.00 0.00 23.50 0.00 1 106.00 0.00 0.00 0.00 24.00 0.00 1 106.00 0.00 0.00 0.00 24.50 0.00 0 106.00 0.00 0.00 0.00 25.00 0.00 0 106.00 0.00 0.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 26HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1SW: Grassed Swale Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 106.00 0.00 0.00 0.00 106.02 0.02 0.02 0.00 106.04 0.02 0.02 0.00 106.06 0.02 0.02 0.00 106.08 0.02 0.02 0.00 106.10 0.02 0.02 0.00 106.12 0.02 0.02 0.00 106.14 0.02 0.02 0.00 106.16 0.02 0.02 0.00 106.18 0.02 0.02 0.00 106.20 0.02 0.02 0.00 106.22 0.02 0.02 0.00 106.24 0.02 0.02 0.00 106.26 0.02 0.02 0.00 106.28 0.02 0.02 0.00 106.30 0.02 0.02 0.00 106.32 0.02 0.02 0.00 106.34 0.02 0.02 0.00 106.36 0.02 0.02 0.00 106.38 0.02 0.02 0.00 106.40 0.02 0.02 0.00 106.42 0.02 0.02 0.00 106.44 0.02 0.02 0.00 106.46 0.02 0.02 0.00 106.48 0.02 0.02 0.00 106.50 0.02 0.02 0.00 106.52 0.02 0.02 0.00 106.54 0.02 0.02 0.00 106.56 0.02 0.02 0.00 106.58 0.02 0.02 0.00 106.60 0.02 0.02 0.00 106.62 0.02 0.02 0.00 106.64 0.02 0.02 0.00 106.66 0.02 0.02 0.00 106.68 0.02 0.02 0.00 106.70 0.02 0.02 0.00 106.72 0.02 0.02 0.00 106.74 0.02 0.02 0.00 106.76 0.02 0.02 0.00 106.78 0.02 0.02 0.00 106.80 0.02 0.02 0.00 106.82 0.02 0.02 0.00 106.84 0.02 0.02 0.00 106.86 0.02 0.02 0.00 106.88 0.03 0.03 0.00 106.90 0.03 0.03 0.00 106.92 0.03 0.03 0.00 106.94 0.03 0.03 0.00 106.96 0.03 0.03 0.00 106.98 0.03 0.03 0.00 107.00 0.03 0.03 0.00 107.02 0.03 0.03 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 107.04 0.03 0.03 0.00 107.06 0.03 0.03 0.00 107.08 0.03 0.03 0.00 107.10 0.03 0.03 0.00 107.12 0.03 0.03 0.00 107.14 0.03 0.03 0.00 107.16 0.03 0.03 0.00 107.18 0.03 0.03 0.00 107.20 0.03 0.03 0.00 107.22 0.03 0.03 0.00 107.24 0.03 0.03 0.00 107.26 0.03 0.03 0.00 107.28 0.03 0.03 0.00 107.30 0.03 0.03 0.00 107.32 0.03 0.03 0.00 107.34 0.03 0.03 0.00 107.36 0.03 0.03 0.00 107.38 0.03 0.03 0.00 107.40 0.03 0.03 0.00 107.42 0.03 0.03 0.00 107.44 0.03 0.03 0.00 107.46 0.03 0.03 0.00 107.48 0.03 0.03 0.00 107.50 0.03 0.03 0.00 107.52 0.11 0.03 0.07 107.54 0.24 0.04 0.21 107.56 0.42 0.04 0.38 107.58 0.63 0.04 0.59 107.60 0.86 0.04 0.83 107.62 1.12 0.04 1.09 107.64 1.41 0.04 1.37 107.66 1.71 0.04 1.67 107.68 2.04 0.04 2.00 107.70 2.38 0.04 2.34 107.72 2.74 0.04 2.70 107.74 3.11 0.04 3.08 107.76 3.51 0.04 3.47 107.78 3.91 0.04 3.88 107.80 4.34 0.04 4.30 107.82 4.78 0.04 4.74 107.84 5.23 0.04 5.19 107.86 5.69 0.04 5.65 107.88 6.17 0.04 6.13 107.90 6.66 0.04 6.62 107.92 7.16 0.04 7.12 107.94 7.68 0.04 7.64 107.96 8.20 0.04 8.16 107.98 8.74 0.04 8.70 108.00 9.29 0.04 9.25 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 27HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1SW: Grassed Swale Elevation (feet) Surface (sq-ft) Wetted (sq-ft) Storage (cubic-feet) 106.00 267 267 0 106.05 276 276 14 106.10 285 286 28 106.15 295 295 42 106.20 304 305 57 106.25 314 315 73 106.30 324 325 88 106.35 334 335 105 106.40 344 345 122 106.45 354 356 139 106.50 365 366 157 106.55 376 377 176 106.60 386 388 195 106.65 397 399 214 106.70 408 410 235 106.75 420 421 255 106.80 431 433 277 106.85 442 444 298 106.90 454 456 321 106.95 466 467 344 107.00 478 479 367 107.05 490 493 392 107.10 502 506 416 107.15 515 520 442 107.20 527 533 468 107.25 540 547 495 107.30 552 561 522 107.35 565 576 550 107.40 578 590 578 107.45 592 605 608 107.50 605 620 638 107.55 618 633 668 107.60 632 647 699 107.65 645 661 731 107.70 659 675 764 107.75 673 689 797 107.80 687 703 831 107.85 701 717 866 107.90 716 732 901 107.95 730 747 938 108.00 745 761 974 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 28HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Inflow Area = 0.249 ac, 58.50% Impervious, Inflow Depth = 1.19" for 2-Year event Inflow = 0.33 cfs @ 12.10 hrs, Volume= 0.025 af Outflow = 0.10 cfs @ 12.49 hrs, Volume= 0.025 af, Atten= 70%, Lag= 23.4 min Discarded = 0.10 cfs @ 12.49 hrs, Volume= 0.025 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach 4R : Post-Discharge Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 99.85' @ 12.49 hrs Surf.Area= 432 sf Storage= 199 cf Plug-Flow detention time= 11.1 min calculated for 0.025 af (100% of inflow) Center-of-Mass det. time= 11.1 min ( 872.2 - 861.1 ) Volume Invert Avail.Storage Storage Description #1 99.00' 898 cf 12.00'W x 36.00'L x 6.00'H Prismatoid 2,592 cf Overall - 597 cf Embedded = 1,995 cf x 45.0% Voids #2 99.00' 509 cf 6.00'D x 6.00'H Vertical Cone/Cylinder x 3 Inside #1 597 cf Overall - 3.0" Wall Thickness = 509 cf 1,407 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 99.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 104.80'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.10 cfs @ 12.49 hrs HW=99.85' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.10 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=99.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 29HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.249 ac Peak Elev=99.85' Storage=199 cf 0.33 cfs 0.10 cfs 0.10 cfs 0.00 cfs Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Exfiltration Broad-Crested Rectangular Weir Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 30HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Wetted Storage Stage-Area-Storage Storage (cubic-feet) 1,4001,2001,0008006004002000 Surface/Horizontal/Wetted Area (sq-ft) 1,0009008007006005004003002001000 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Prismatoid + Vertical Cone/Cylinder Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 31HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 99.00 0.00 0.00 0.00 0.50 0.00 0 99.00 0.00 0.00 0.00 1.00 0.00 0 99.00 0.00 0.00 0.00 1.50 0.00 0 99.00 0.00 0.00 0.00 2.00 0.00 0 99.00 0.00 0.00 0.00 2.50 0.00 0 99.00 0.00 0.00 0.00 3.00 0.00 0 99.00 0.00 0.00 0.00 3.50 0.00 0 99.00 0.00 0.00 0.00 4.00 0.00 0 99.00 0.00 0.00 0.00 4.50 0.00 0 99.00 0.00 0.00 0.00 5.00 0.00 0 99.00 0.00 0.00 0.00 5.50 0.00 0 99.00 0.00 0.00 0.00 6.00 0.00 0 99.00 0.00 0.00 0.00 6.50 0.00 0 99.00 0.00 0.00 0.00 7.00 0.00 0 99.00 0.00 0.00 0.00 7.50 0.00 0 99.00 0.00 0.00 0.00 8.00 0.00 0 99.00 0.00 0.00 0.00 8.50 0.00 0 99.00 0.00 0.00 0.00 9.00 0.00 0 99.00 0.00 0.00 0.00 9.50 0.00 0 99.00 0.00 0.00 0.00 10.00 0.00 0 99.00 0.00 0.00 0.00 10.50 0.00 0 99.00 0.00 0.00 0.00 11.00 0.00 0 99.00 0.00 0.00 0.00 11.50 0.01 0 99.00 0.01 0.01 0.00 12.00 0.17 14 99.06 0.08 0.08 0.00 12.50 0.09 199 99.85 0.10 0.10 0.00 13.00 0.04 124 99.53 0.09 0.09 0.00 13.50 0.03 28 99.12 0.08 0.08 0.00 14.00 0.03 1 99.00 0.03 0.03 0.00 14.50 0.02 1 99.00 0.02 0.02 0.00 15.00 0.02 1 99.00 0.02 0.02 0.00 15.50 0.02 1 99.00 0.02 0.02 0.00 16.00 0.02 0 99.00 0.02 0.02 0.00 16.50 0.01 0 99.00 0.01 0.01 0.00 17.00 0.01 0 99.00 0.01 0.01 0.00 17.50 0.01 0 99.00 0.01 0.01 0.00 18.00 0.01 0 99.00 0.01 0.01 0.00 18.50 0.01 0 99.00 0.01 0.01 0.00 19.00 0.01 0 99.00 0.01 0.01 0.00 19.50 0.01 0 99.00 0.01 0.01 0.00 20.00 0.01 0 99.00 0.01 0.01 0.00 20.50 0.01 0 99.00 0.01 0.01 0.00 21.00 0.01 0 99.00 0.01 0.01 0.00 21.50 0.01 0 99.00 0.01 0.01 0.00 22.00 0.01 0 99.00 0.01 0.01 0.00 22.50 0.01 0 99.00 0.01 0.01 0.00 23.00 0.01 0 99.00 0.01 0.01 0.00 23.50 0.01 0 99.00 0.01 0.01 0.00 24.00 0.01 0 99.00 0.01 0.01 0.00 24.50 0.00 0 99.00 0.00 0.00 0.00 25.00 0.00 0 99.00 0.00 0.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 32HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 99.00 0.00 0.00 0.00 99.10 0.08 0.08 0.00 99.20 0.09 0.09 0.00 99.30 0.09 0.09 0.00 99.40 0.09 0.09 0.00 99.50 0.09 0.09 0.00 99.60 0.09 0.09 0.00 99.70 0.10 0.10 0.00 99.80 0.10 0.10 0.00 99.90 0.10 0.10 0.00 100.00 0.10 0.10 0.00 100.10 0.10 0.10 0.00 100.20 0.10 0.10 0.00 100.30 0.11 0.11 0.00 100.40 0.11 0.11 0.00 100.50 0.11 0.11 0.00 100.60 0.11 0.11 0.00 100.70 0.11 0.11 0.00 100.80 0.12 0.12 0.00 100.90 0.12 0.12 0.00 101.00 0.12 0.12 0.00 101.10 0.12 0.12 0.00 101.20 0.12 0.12 0.00 101.30 0.12 0.12 0.00 101.40 0.13 0.13 0.00 101.50 0.13 0.13 0.00 101.60 0.13 0.13 0.00 101.70 0.13 0.13 0.00 101.80 0.13 0.13 0.00 101.90 0.14 0.14 0.00 102.00 0.14 0.14 0.00 102.10 0.14 0.14 0.00 102.20 0.14 0.14 0.00 102.30 0.14 0.14 0.00 102.40 0.15 0.15 0.00 102.50 0.15 0.15 0.00 102.60 0.15 0.15 0.00 102.70 0.15 0.15 0.00 102.80 0.15 0.15 0.00 102.90 0.15 0.15 0.00 103.00 0.16 0.16 0.00 103.10 0.16 0.16 0.00 103.20 0.16 0.16 0.00 103.30 0.16 0.16 0.00 103.40 0.16 0.16 0.00 103.50 0.17 0.17 0.00 103.60 0.17 0.17 0.00 103.70 0.17 0.17 0.00 103.80 0.17 0.17 0.00 103.90 0.17 0.17 0.00 104.00 0.17 0.17 0.00 104.10 0.18 0.18 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 104.20 0.18 0.18 0.00 104.30 0.18 0.18 0.00 104.40 0.18 0.18 0.00 104.50 0.18 0.18 0.00 104.60 0.19 0.19 0.00 104.70 0.19 0.19 0.00 104.80 0.19 0.19 0.00 104.90 1.18 0.19 0.99 105.00 2.98 0.19 2.79 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 33HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 99.00 432 0 99.10 442 23 99.20 451 47 99.30 461 70 99.40 470 94 99.50 480 117 99.60 490 141 99.70 499 164 99.80 509 188 99.90 518 211 100.00 528 234 100.10 538 258 100.20 547 281 100.30 557 305 100.40 566 328 100.50 576 352 100.60 586 375 100.70 595 399 100.80 605 422 100.90 614 445 101.00 624 469 101.10 634 492 101.20 643 516 101.30 653 539 101.40 662 563 101.50 672 586 101.60 682 610 101.70 691 633 101.80 701 656 101.90 710 680 102.00 720 703 102.10 730 727 102.20 739 750 102.30 749 774 102.40 758 797 102.50 768 820 102.60 778 844 102.70 787 867 102.80 797 891 102.90 806 914 103.00 816 938 103.10 826 961 103.20 835 985 103.30 845 1,008 103.40 854 1,031 103.50 864 1,055 103.60 874 1,078 103.70 883 1,102 103.80 893 1,125 103.90 902 1,149 104.00 912 1,172 104.10 922 1,196 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 104.20 931 1,219 104.30 941 1,242 104.40 950 1,266 104.50 960 1,289 104.60 970 1,313 104.70 979 1,336 104.80 989 1,360 104.90 998 1,383 105.00 1,008 1,407 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 34HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB1: One (1) Solid Catch Basin with Hood Inflow Area = 0.147 ac, 53.13% Impervious, Inflow Depth = 0.00" for 2-Year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Pond 1P : (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 105.50' @ 0.00 hrs Flood Elev= 107.50' Device Routing Invert Outlet Devices #1 Primary 105.50'12.0" Round Culvert L= 20.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 105.50' / 105.00' S= 0.0250 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.79 sf Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=105.50' TW=99.00' (Dynamic Tailwater) 1=Culvert ( Controls 0.00 cfs) Pond CB1: One (1) Solid Catch Basin with Hood Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.147 ac Peak Elev=105.50' 12.0" Round Culvert n=0.020 L=20.0' S=0.0250 '/' 0.00 cfs 0.00 cfs Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 35HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB1: One (1) Solid Catch Basin with Hood Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 107 106 Culvert Pond CB1: One (1) Solid Catch Basin with Hood Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 107 106 Flood Elevation Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 36HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB1: One (1) Solid Catch Basin with Hood Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 105.50 0.00 0.50 0.00 105.50 0.00 1.00 0.00 105.50 0.00 1.50 0.00 105.50 0.00 2.00 0.00 105.50 0.00 2.50 0.00 105.50 0.00 3.00 0.00 105.50 0.00 3.50 0.00 105.50 0.00 4.00 0.00 105.50 0.00 4.50 0.00 105.50 0.00 5.00 0.00 105.50 0.00 5.50 0.00 105.50 0.00 6.00 0.00 105.50 0.00 6.50 0.00 105.50 0.00 7.00 0.00 105.50 0.00 7.50 0.00 105.50 0.00 8.00 0.00 105.50 0.00 8.50 0.00 105.50 0.00 9.00 0.00 105.50 0.00 9.50 0.00 105.50 0.00 10.00 0.00 105.50 0.00 10.50 0.00 105.50 0.00 11.00 0.00 105.50 0.00 11.50 0.00 105.50 0.00 12.00 0.00 105.50 0.00 12.50 0.00 105.50 0.00 13.00 0.00 105.50 0.00 13.50 0.00 105.50 0.00 14.00 0.00 105.50 0.00 14.50 0.00 105.50 0.00 15.00 0.00 105.50 0.00 15.50 0.00 105.50 0.00 16.00 0.00 105.50 0.00 16.50 0.00 105.50 0.00 17.00 0.00 105.50 0.00 17.50 0.00 105.50 0.00 18.00 0.00 105.50 0.00 18.50 0.00 105.50 0.00 19.00 0.00 105.50 0.00 19.50 0.00 105.50 0.00 20.00 0.00 105.50 0.00 20.50 0.00 105.50 0.00 21.00 0.00 105.50 0.00 21.50 0.00 105.50 0.00 22.00 0.00 105.50 0.00 22.50 0.00 105.50 0.00 23.00 0.00 105.50 0.00 23.50 0.00 105.50 0.00 24.00 0.00 105.50 0.00 24.50 0.00 105.50 0.00 25.00 0.00 105.50 0.00 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 37HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB1: One (1) Solid Catch Basin with Hood Elevation (feet) Primary (cfs) 105.50 0.00 105.51 0.00 105.52 0.00 105.53 0.00 105.54 0.01 105.55 0.01 105.56 0.01 105.57 0.02 105.58 0.02 105.59 0.03 105.60 0.03 105.61 0.04 105.62 0.05 105.63 0.06 105.64 0.07 105.65 0.08 105.66 0.09 105.67 0.10 105.68 0.11 105.69 0.12 105.70 0.13 105.71 0.15 105.72 0.16 105.73 0.18 105.74 0.19 105.75 0.21 105.76 0.22 105.77 0.24 105.78 0.26 105.79 0.27 105.80 0.29 105.81 0.31 105.82 0.33 105.83 0.35 105.84 0.37 105.85 0.39 105.86 0.41 105.87 0.43 105.88 0.45 105.89 0.48 105.90 0.50 105.91 0.52 105.92 0.55 105.93 0.57 105.94 0.59 105.95 0.62 105.96 0.64 105.97 0.67 105.98 0.69 105.99 0.72 106.00 0.75 106.01 0.77 Elevation (feet) Primary (cfs) 106.02 0.80 106.03 0.83 106.04 0.85 106.05 0.88 106.06 0.91 106.07 0.94 106.08 0.97 106.09 1.00 106.10 1.02 106.11 1.05 106.12 1.08 106.13 1.11 106.14 1.14 106.15 1.17 106.16 1.20 106.17 1.23 106.18 1.26 106.19 1.29 106.20 1.32 106.21 1.35 106.22 1.38 106.23 1.41 106.24 1.44 106.25 1.47 106.26 1.50 106.27 1.53 106.28 1.56 106.29 1.59 106.30 1.62 106.31 1.65 106.32 1.68 106.33 1.71 106.34 1.74 106.35 1.76 106.36 1.79 106.37 1.82 106.38 1.85 106.39 1.87 106.40 1.90 106.41 1.92 106.42 1.95 106.43 1.97 106.44 2.00 106.45 2.02 106.46 2.04 106.47 2.06 106.48 2.08 106.49 2.10 106.50 2.11 106.51 2.13 106.52 2.15 106.53 2.17 Elevation (feet) Primary (cfs) 106.54 2.19 106.55 2.21 106.56 2.23 106.57 2.25 106.58 2.27 106.59 2.29 106.60 2.31 106.61 2.33 106.62 2.35 106.63 2.37 106.64 2.39 106.65 2.41 106.66 2.43 106.67 2.44 106.68 2.46 106.69 2.48 106.70 2.50 106.71 2.52 106.72 2.53 106.73 2.55 106.74 2.57 106.75 2.59 106.76 2.60 106.77 2.62 106.78 2.64 106.79 2.65 106.80 2.67 106.81 2.69 106.82 2.70 106.83 2.72 106.84 2.74 106.85 2.75 106.86 2.77 106.87 2.78 106.88 2.80 106.89 2.82 106.90 2.83 106.91 2.85 106.92 2.86 106.93 2.88 106.94 2.89 106.95 2.91 106.96 2.93 106.97 2.94 106.98 2.96 106.99 2.97 107.00 2.99 107.01 3.00 107.02 3.02 107.03 3.03 107.04 3.04 107.05 3.06 Elevation (feet) Primary (cfs) 107.06 3.07 107.07 3.09 107.08 3.10 107.09 3.12 107.10 3.13 107.11 3.15 107.12 3.16 107.13 3.17 107.14 3.19 107.15 3.20 107.16 3.22 107.17 3.23 107.18 3.24 107.19 3.26 107.20 3.27 107.21 3.28 107.22 3.30 107.23 3.31 107.24 3.32 107.25 3.34 107.26 3.35 107.27 3.36 107.28 3.38 107.29 3.39 107.30 3.40 107.31 3.42 107.32 3.43 107.33 3.44 107.34 3.46 107.35 3.47 107.36 3.48 107.37 3.49 107.38 3.51 107.39 3.52 107.40 3.53 107.41 3.55 107.42 3.56 107.43 3.57 107.44 3.58 107.45 3.60 107.46 3.61 107.47 3.62 107.48 3.63 107.49 3.64 107.50 3.66 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 38HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB1: One (1) Solid Catch Basin with Hood Elevation (feet) Storage (acre-feet) 105.50 0.000 105.52 0.000 105.54 0.000 105.56 0.000 105.58 0.000 105.60 0.000 105.62 0.000 105.64 0.000 105.66 0.000 105.68 0.000 105.70 0.000 105.72 0.000 105.74 0.000 105.76 0.000 105.78 0.000 105.80 0.000 105.82 0.000 105.84 0.000 105.86 0.000 105.88 0.000 105.90 0.000 105.92 0.000 105.94 0.000 105.96 0.000 105.98 0.000 106.00 0.000 106.02 0.000 106.04 0.000 106.06 0.000 106.08 0.000 106.10 0.000 106.12 0.000 106.14 0.000 106.16 0.000 106.18 0.000 106.20 0.000 106.22 0.000 106.24 0.000 106.26 0.000 106.28 0.000 106.30 0.000 106.32 0.000 106.34 0.000 106.36 0.000 106.38 0.000 106.40 0.000 106.42 0.000 106.44 0.000 106.46 0.000 106.48 0.000 106.50 0.000 106.52 0.000 Elevation (feet) Storage (acre-feet) 106.54 0.000 106.56 0.000 106.58 0.000 106.60 0.000 106.62 0.000 106.64 0.000 106.66 0.000 106.68 0.000 106.70 0.000 106.72 0.000 106.74 0.000 106.76 0.000 106.78 0.000 106.80 0.000 106.82 0.000 106.84 0.000 106.86 0.000 106.88 0.000 106.90 0.000 106.92 0.000 106.94 0.000 106.96 0.000 106.98 0.000 107.00 0.000 107.02 0.000 107.04 0.000 107.06 0.000 107.08 0.000 107.10 0.000 107.12 0.000 107.14 0.000 107.16 0.000 107.18 0.000 107.20 0.000 107.22 0.000 107.24 0.000 107.26 0.000 107.28 0.000 107.30 0.000 107.32 0.000 107.34 0.000 107.36 0.000 107.38 0.000 107.40 0.000 107.42 0.000 107.44 0.000 107.46 0.000 107.48 0.000 107.50 0.000 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 39HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB2: Pool Drain and Roof Leaders Inflow Area = 0.249 ac, 58.50% Impervious, Inflow Depth = 1.19" for 2-Year event Inflow = 0.33 cfs @ 12.10 hrs, Volume= 0.025 af Outflow = 0.33 cfs @ 12.10 hrs, Volume= 0.025 af, Atten= 0%, Lag= 0.0 min Primary = 0.33 cfs @ 12.10 hrs, Volume= 0.025 af Routed to Pond 2P : (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 110.69' @ 12.10 hrs Flood Elev= 111.00' Device Routing Invert Outlet Devices #1 Primary 110.50'6.0" Round Culvert X 4.00 L= 50.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 110.50' / 105.00' S= 0.1100 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.20 sf Primary OutFlow Max=0.33 cfs @ 12.10 hrs HW=110.69' TW=99.32' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.33 cfs @ 1.18 fps) Pond CB2: Pool Drain and Roof Leaders Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.249 ac Peak Elev=110.69' 6.0" Round Culvert x 4.00 n=0.020 L=50.0' S=0.1100 '/' 0.33 cfs 0.33 cfs Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 40HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB2: Pool Drain and Roof Leaders Primary Stage-Discharge Discharge (cfs) 10 El e v a t i o n ( f e e t ) 111 110.98 110.96 110.94 110.92 110.9 110.88 110.86 110.84 110.82 110.8 110.78 110.76 110.74 110.72 110.7 110.68 110.66 110.64 110.62 110.6 110.58 110.56 110.54 110.52 110.5 Culvert Pond CB2: Pool Drain and Roof Leaders Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 111 110.98 110.96 110.94 110.92 110.9 110.88 110.86 110.84 110.82 110.8 110.78 110.76 110.74 110.72 110.7 110.68 110.66 110.64 110.62 110.6 110.58 110.56 110.54 110.52 110.5 Flood Elevation Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 41HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB2: Pool Drain and Roof Leaders Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 110.50 0.00 0.50 0.00 110.50 0.00 1.00 0.00 110.50 0.00 1.50 0.00 110.50 0.00 2.00 0.00 110.50 0.00 2.50 0.00 110.50 0.00 3.00 0.00 110.50 0.00 3.50 0.00 110.50 0.00 4.00 0.00 110.50 0.00 4.50 0.00 110.50 0.00 5.00 0.00 110.50 0.00 5.50 0.00 110.50 0.00 6.00 0.00 110.50 0.00 6.50 0.00 110.50 0.00 7.00 0.00 110.50 0.00 7.50 0.00 110.50 0.00 8.00 0.00 110.50 0.00 8.50 0.00 110.50 0.00 9.00 0.00 110.50 0.00 9.50 0.00 110.50 0.00 10.00 0.00 110.50 0.00 10.50 0.00 110.50 0.00 11.00 0.00 110.52 0.00 11.50 0.01 110.53 0.01 12.00 0.17 110.63 0.17 12.50 0.09 110.60 0.09 13.00 0.04 110.56 0.04 13.50 0.03 110.56 0.03 14.00 0.03 110.55 0.03 14.50 0.02 110.55 0.02 15.00 0.02 110.55 0.02 15.50 0.02 110.54 0.02 16.00 0.02 110.54 0.02 16.50 0.01 110.54 0.01 17.00 0.01 110.54 0.01 17.50 0.01 110.53 0.01 18.00 0.01 110.53 0.01 18.50 0.01 110.53 0.01 19.00 0.01 110.53 0.01 19.50 0.01 110.53 0.01 20.00 0.01 110.53 0.01 20.50 0.01 110.53 0.01 21.00 0.01 110.53 0.01 21.50 0.01 110.53 0.01 22.00 0.01 110.53 0.01 22.50 0.01 110.52 0.01 23.00 0.01 110.52 0.01 23.50 0.01 110.52 0.01 24.00 0.01 110.52 0.01 24.50 0.00 110.50 0.00 25.00 0.00 110.50 0.00 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 42HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB2: Pool Drain and Roof Leaders Elevation (feet) Primary (cfs) 110.50 0.00 110.51 0.00 110.52 0.00 110.53 0.01 110.54 0.02 110.55 0.02 110.56 0.04 110.57 0.05 110.58 0.06 110.59 0.08 110.60 0.10 110.61 0.11 110.62 0.13 110.63 0.16 110.64 0.18 110.65 0.21 110.66 0.23 110.67 0.26 110.68 0.29 110.69 0.32 110.70 0.35 110.71 0.39 110.72 0.42 110.73 0.45 110.74 0.49 110.75 0.53 110.76 0.57 110.77 0.60 110.78 0.64 110.79 0.68 110.80 0.72 110.81 0.77 110.82 0.81 110.83 0.85 110.84 0.89 110.85 0.93 110.86 0.98 110.87 1.02 110.88 1.06 110.89 1.10 110.90 1.15 110.91 1.19 110.92 1.23 110.93 1.27 110.94 1.31 110.95 1.34 110.96 1.38 110.97 1.41 110.98 1.44 110.99 1.47 111.00 1.49 Type III 24-hr 2-Year Rainfall=3.60"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 43HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB2: Pool Drain and Roof Leaders Elevation (feet) Storage (acre-feet) 110.50 0.000 110.51 0.000 110.52 0.000 110.53 0.000 110.54 0.000 110.55 0.000 110.56 0.000 110.57 0.000 110.58 0.000 110.59 0.000 110.60 0.000 110.61 0.000 110.62 0.000 110.63 0.000 110.64 0.000 110.65 0.000 110.66 0.000 110.67 0.000 110.68 0.000 110.69 0.000 110.70 0.000 110.71 0.000 110.72 0.000 110.73 0.000 110.74 0.000 110.75 0.000 110.76 0.000 110.77 0.000 110.78 0.000 110.79 0.000 110.80 0.000 110.81 0.000 110.82 0.000 110.83 0.000 110.84 0.000 110.85 0.000 110.86 0.000 110.87 0.000 110.88 0.000 110.89 0.000 110.90 0.000 110.91 0.000 110.92 0.000 110.93 0.000 110.94 0.000 110.95 0.000 110.96 0.000 110.97 0.000 110.98 0.000 110.99 0.000 111.00 0.000 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 44HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1Ex: Existing Project Area Runoff = 0.11 cfs @ 12.32 hrs, Volume= 0.021 af, Depth= 0.44" Routed to Reach 1Dis : Pre- Dev Peak Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 10-Year Rainfall=5.30" Area (sf) CN Description * 4,410 98 Driveway/House/Pool, HSG A 2,500 39 >75% Grass cover, Good, HSG A 18,214 30 Woods, Good, HSG A 25,124 43 Weighted Average 20,714 82.45% Pervious Area 4,410 17.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1Ex: Existing Project Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.12 0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr 10-Year Rainfall=5.30" Runoff Area=25,124 sf Runoff Volume=0.021 af Runoff Depth=0.44" Tc=6.0 min CN=43 0.11 cfs Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 45HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1Ex: Existing Project Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.05 0.00 0.00 1.50 0.08 0.00 0.00 2.00 0.11 0.00 0.00 2.50 0.13 0.00 0.00 3.00 0.16 0.00 0.00 3.50 0.19 0.00 0.00 4.00 0.23 0.00 0.00 4.50 0.26 0.00 0.00 5.00 0.30 0.00 0.00 5.50 0.34 0.00 0.00 6.00 0.38 0.00 0.00 6.50 0.43 0.00 0.00 7.00 0.48 0.00 0.00 7.50 0.54 0.00 0.00 8.00 0.60 0.00 0.00 8.50 0.68 0.00 0.00 9.00 0.77 0.00 0.00 9.50 0.88 0.00 0.00 10.00 1.00 0.00 0.00 10.50 1.15 0.00 0.00 11.00 1.33 0.00 0.00 11.50 1.58 0.00 0.00 12.00 2.65 0.00 0.00 12.50 3.72 0.08 0.08 13.00 3.97 0.12 0.04 13.50 4.15 0.15 0.04 14.00 4.30 0.18 0.03 14.50 4.42 0.21 0.03 15.00 4.53 0.23 0.03 15.50 4.62 0.25 0.02 16.00 4.70 0.27 0.02 16.50 4.76 0.29 0.02 17.00 4.82 0.31 0.02 17.50 4.87 0.32 0.02 18.00 4.92 0.33 0.01 18.50 4.96 0.34 0.01 19.00 5.00 0.35 0.01 19.50 5.04 0.36 0.01 20.00 5.07 0.37 0.01 20.50 5.11 0.38 0.01 21.00 5.14 0.39 0.01 21.50 5.17 0.40 0.01 22.00 5.20 0.41 0.01 22.50 5.23 0.42 0.01 23.00 5.25 0.43 0.01 23.50 5.28 0.43 0.01 24.00 5.30 0.44 0.01 24.50 5.30 0.44 0.00 25.00 5.30 0.44 0.00 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 46HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Driveway Area with Landscape Runoff = 0.38 cfs @ 12.09 hrs, Volume= 0.028 af, Depth= 2.26" Routed to Pond 1SW : Grassed Swale Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 10-Year Rainfall=5.30" Area (sf) CN Description * 3,400 98 Driveway/House/Pool, HSG A 3,000 39 >75% Grass cover, Good, HSG A 6,400 70 Weighted Average 3,000 46.88% Pervious Area 3,400 53.13% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1S: Driveway Area with Landscape Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 10-Year Rainfall=5.30" Runoff Area=6,400 sf Runoff Volume=0.028 af Runoff Depth=2.26" Tc=6.0 min CN=70 0.38 cfs Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 47HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: Driveway Area with Landscape Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.05 0.00 0.00 1.50 0.08 0.00 0.00 2.00 0.11 0.00 0.00 2.50 0.13 0.00 0.00 3.00 0.16 0.00 0.00 3.50 0.19 0.00 0.00 4.00 0.23 0.00 0.00 4.50 0.26 0.00 0.00 5.00 0.30 0.00 0.00 5.50 0.34 0.00 0.00 6.00 0.38 0.00 0.00 6.50 0.43 0.00 0.00 7.00 0.48 0.00 0.00 7.50 0.54 0.00 0.00 8.00 0.60 0.00 0.00 8.50 0.68 0.00 0.00 9.00 0.77 0.00 0.00 9.50 0.88 0.00 0.00 10.00 1.00 0.00 0.00 10.50 1.15 0.02 0.01 11.00 1.33 0.05 0.01 11.50 1.58 0.10 0.02 12.00 2.65 0.53 0.21 12.50 3.72 1.15 0.10 13.00 3.97 1.31 0.04 13.50 4.15 1.43 0.03 14.00 4.30 1.53 0.03 14.50 4.42 1.62 0.02 15.00 4.53 1.69 0.02 15.50 4.62 1.76 0.02 16.00 4.70 1.81 0.02 16.50 4.76 1.86 0.01 17.00 4.82 1.90 0.01 17.50 4.87 1.94 0.01 18.00 4.92 1.98 0.01 18.50 4.96 2.01 0.01 19.00 5.00 2.04 0.01 19.50 5.04 2.06 0.01 20.00 5.07 2.09 0.01 20.50 5.11 2.12 0.01 21.00 5.14 2.14 0.01 21.50 5.17 2.16 0.01 22.00 5.20 2.18 0.01 22.50 5.23 2.21 0.01 23.00 5.25 2.23 0.01 23.50 5.28 2.24 0.01 24.00 5.30 2.26 0.01 24.50 5.30 2.26 0.00 25.00 5.30 2.26 0.00 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 48HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: House Roof Area & Patio Runoff = 0.71 cfs @ 12.09 hrs, Volume= 0.050 af, Depth= 2.43" Routed to Pond CB2 : Pool Drain and Roof Leaders Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 10-Year Rainfall=5.30" Area (sf) CN Description * 4,443 98 House Area * 1,900 98 Patio-Pool Area 2,500 39 >75% Grass cover, Good, HSG A 2,000 30 Woods, Good, HSG A 10,843 72 Weighted Average 4,500 41.50% Pervious Area 6,343 58.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 2S: House Roof Area & Patio Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 10-Year Rainfall=5.30" Runoff Area=10,843 sf Runoff Volume=0.050 af Runoff Depth=2.43" Tc=6.0 min CN=72 0.71 cfs Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 49HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: House Roof Area & Patio Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.05 0.00 0.00 1.50 0.08 0.00 0.00 2.00 0.11 0.00 0.00 2.50 0.13 0.00 0.00 3.00 0.16 0.00 0.00 3.50 0.19 0.00 0.00 4.00 0.23 0.00 0.00 4.50 0.26 0.00 0.00 5.00 0.30 0.00 0.00 5.50 0.34 0.00 0.00 6.00 0.38 0.00 0.00 6.50 0.43 0.00 0.00 7.00 0.48 0.00 0.00 7.50 0.54 0.00 0.00 8.00 0.60 0.00 0.00 8.50 0.68 0.00 0.00 9.00 0.77 0.00 0.00 9.50 0.88 0.00 0.00 10.00 1.00 0.01 0.01 10.50 1.15 0.03 0.01 11.00 1.33 0.07 0.02 11.50 1.58 0.14 0.04 12.00 2.65 0.61 0.39 12.50 3.72 1.27 0.18 13.00 3.97 1.44 0.08 13.50 4.15 1.57 0.06 14.00 4.30 1.67 0.05 14.50 4.42 1.76 0.04 15.00 4.53 1.84 0.04 15.50 4.62 1.91 0.03 16.00 4.70 1.97 0.03 16.50 4.76 2.02 0.02 17.00 4.82 2.06 0.02 17.50 4.87 2.10 0.02 18.00 4.92 2.14 0.02 18.50 4.96 2.17 0.02 19.00 5.00 2.20 0.01 19.50 5.04 2.23 0.01 20.00 5.07 2.25 0.01 20.50 5.11 2.28 0.01 21.00 5.14 2.30 0.01 21.50 5.17 2.33 0.01 22.00 5.20 2.35 0.01 22.50 5.23 2.37 0.01 23.00 5.25 2.39 0.01 23.50 5.28 2.41 0.01 24.00 5.30 2.43 0.01 24.50 5.30 2.43 0.00 25.00 5.30 2.43 0.00 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 50HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Undeveloped Areas Runoff = 0.00 cfs @ 22.06 hrs, Volume= 0.000 af, Depth= 0.02" Routed to Reach 4R : Post-Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 10-Year Rainfall=5.30" Area (sf) CN Description 7,881 30 Woods, Good, HSG A 7,881 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 3S: Undeveloped Areas Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0 0 0 0 0 Type III 24-hr 10-Year Rainfall=5.30" Runoff Area=7,881 sf Runoff Volume=0.000 af Runoff Depth=0.02" Tc=6.0 min CN=30 0.00 cfs Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 51HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: Undeveloped Areas Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.05 0.00 0.00 1.50 0.08 0.00 0.00 2.00 0.11 0.00 0.00 2.50 0.13 0.00 0.00 3.00 0.16 0.00 0.00 3.50 0.19 0.00 0.00 4.00 0.23 0.00 0.00 4.50 0.26 0.00 0.00 5.00 0.30 0.00 0.00 5.50 0.34 0.00 0.00 6.00 0.38 0.00 0.00 6.50 0.43 0.00 0.00 7.00 0.48 0.00 0.00 7.50 0.54 0.00 0.00 8.00 0.60 0.00 0.00 8.50 0.68 0.00 0.00 9.00 0.77 0.00 0.00 9.50 0.88 0.00 0.00 10.00 1.00 0.00 0.00 10.50 1.15 0.00 0.00 11.00 1.33 0.00 0.00 11.50 1.58 0.00 0.00 12.00 2.65 0.00 0.00 12.50 3.72 0.00 0.00 13.00 3.97 0.00 0.00 13.50 4.15 0.00 0.00 14.00 4.30 0.00 0.00 14.50 4.42 0.00 0.00 15.00 4.53 0.00 0.00 15.50 4.62 0.00 0.00 16.00 4.70 0.00 0.00 16.50 4.76 0.00 0.00 17.00 4.82 0.00 0.00 17.50 4.87 0.00 0.00 18.00 4.92 0.00 0.00 18.50 4.96 0.00 0.00 19.00 5.00 0.00 0.00 19.50 5.04 0.01 0.00 20.00 5.07 0.01 0.00 20.50 5.11 0.01 0.00 21.00 5.14 0.01 0.00 21.50 5.17 0.01 0.00 22.00 5.20 0.01 0.00 22.50 5.23 0.01 0.00 23.00 5.25 0.01 0.00 23.50 5.28 0.02 0.00 24.00 5.30 0.02 0.00 24.50 5.30 0.02 0.00 25.00 5.30 0.02 0.00 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 52HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 1Dis: Pre- Dev Peak Discharge [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.577 ac, 17.55% Impervious, Inflow Depth = 0.44" for 10-Year event Inflow = 0.11 cfs @ 12.32 hrs, Volume= 0.021 af Outflow = 0.11 cfs @ 12.32 hrs, Volume= 0.021 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 1Dis: Pre- Dev Peak Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.12 0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.577 ac 0.11 cfs 0.11 cfs Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 53HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 1Dis: Pre- Dev Peak Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.08 0.08 13.00 0.04 0.04 13.50 0.04 0.04 14.00 0.03 0.03 14.50 0.03 0.03 15.00 0.03 0.03 15.50 0.02 0.02 16.00 0.02 0.02 16.50 0.02 0.02 17.00 0.02 0.02 17.50 0.02 0.02 18.00 0.01 0.01 18.50 0.01 0.01 19.00 0.01 0.01 19.50 0.01 0.01 20.00 0.01 0.01 20.50 0.01 0.01 21.00 0.01 0.01 21.50 0.01 0.01 22.00 0.01 0.01 22.50 0.01 0.01 23.00 0.01 0.01 23.50 0.01 0.01 24.00 0.01 0.01 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 54HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 4R: Post-Discharge [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.577 ac, 38.78% Impervious, Inflow Depth = 0.01" for 10-Year event Inflow = 0.00 cfs @ 22.06 hrs, Volume= 0.000 af Outflow = 0.00 cfs @ 22.06 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 4R: Post-Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0 0 0 Inflow Area=0.577 ac 0.00 cfs 0.00 cfs Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 55HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: Post-Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.00 0.00 13.00 0.00 0.00 13.50 0.00 0.00 14.00 0.00 0.00 14.50 0.00 0.00 15.00 0.00 0.00 15.50 0.00 0.00 16.00 0.00 0.00 16.50 0.00 0.00 17.00 0.00 0.00 17.50 0.00 0.00 18.00 0.00 0.00 18.50 0.00 0.00 19.00 0.00 0.00 19.50 0.00 0.00 20.00 0.00 0.00 20.50 0.00 0.00 21.00 0.00 0.00 21.50 0.00 0.00 22.00 0.00 0.00 22.50 0.00 0.00 23.00 0.00 0.00 23.50 0.00 0.00 24.00 0.00 0.00 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 56HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Inflow Area = 0.147 ac, 53.13% Impervious, Inflow Depth = 0.00" for 10-Year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach 4R : Post-Discharge Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 99.00' @ 0.00 hrs Surf.Area= 154 sf Storage= 0 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no inflow) Volume Invert Avail.Storage Storage Description #1 99.00' 170 cf 6.00'D x 6.00'H Vertical Cone/Cylinder Inside #2 199 cf Overall - 3.0" Wall Thickness = 170 cf #2 99.00' 326 cf 14.00'D x 6.00'H Vertical Cone/Cylinder 924 cf Overall - 199 cf Embedded = 725 cf x 45.0% Voids 496 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 99.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 104.80'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=99.00' (Free Discharge) 1=Exfiltration ( Controls 0.00 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=99.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 57HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.147 ac Peak Elev=99.00' Storage=0 cf 0.00 cfs 0.00 cfs 0.00 cfs 0.00 cfs Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Exfiltration Broad-Crested Rectangular Weir Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 58HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Wetted Storage Stage-Area-Storage Storage (cubic-feet) 450400350300250200150100500 Surface/Horizontal/Wetted Area (sq-ft) 400350300250200150100500 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Vertical Cone/Cylinder + Vertical Cone/Cylinder Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 59HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 99.00 0.00 0.00 0.00 0.50 0.00 99.00 0.00 0.00 0.00 1.00 0.00 99.00 0.00 0.00 0.00 1.50 0.00 99.00 0.00 0.00 0.00 2.00 0.00 99.00 0.00 0.00 0.00 2.50 0.00 99.00 0.00 0.00 0.00 3.00 0.00 99.00 0.00 0.00 0.00 3.50 0.00 99.00 0.00 0.00 0.00 4.00 0.00 99.00 0.00 0.00 0.00 4.50 0.00 99.00 0.00 0.00 0.00 5.00 0.00 99.00 0.00 0.00 0.00 5.50 0.00 99.00 0.00 0.00 0.00 6.00 0.00 99.00 0.00 0.00 0.00 6.50 0.00 99.00 0.00 0.00 0.00 7.00 0.00 99.00 0.00 0.00 0.00 7.50 0.00 99.00 0.00 0.00 0.00 8.00 0.00 99.00 0.00 0.00 0.00 8.50 0.00 99.00 0.00 0.00 0.00 9.00 0.00 99.00 0.00 0.00 0.00 9.50 0.00 99.00 0.00 0.00 0.00 10.00 0.00 99.00 0.00 0.00 0.00 10.50 0.00 99.00 0.00 0.00 0.00 11.00 0.00 99.00 0.00 0.00 0.00 11.50 0.00 99.00 0.00 0.00 0.00 12.00 0.00 99.00 0.00 0.00 0.00 12.50 0.00 99.00 0.00 0.00 0.00 13.00 0.00 99.00 0.00 0.00 0.00 13.50 0.00 99.00 0.00 0.00 0.00 14.00 0.00 99.00 0.00 0.00 0.00 14.50 0.00 99.00 0.00 0.00 0.00 15.00 0.00 99.00 0.00 0.00 0.00 15.50 0.00 99.00 0.00 0.00 0.00 16.00 0.00 99.00 0.00 0.00 0.00 16.50 0.00 99.00 0.00 0.00 0.00 17.00 0.00 99.00 0.00 0.00 0.00 17.50 0.00 99.00 0.00 0.00 0.00 18.00 0.00 99.00 0.00 0.00 0.00 18.50 0.00 99.00 0.00 0.00 0.00 19.00 0.00 99.00 0.00 0.00 0.00 19.50 0.00 99.00 0.00 0.00 0.00 20.00 0.00 99.00 0.00 0.00 0.00 20.50 0.00 99.00 0.00 0.00 0.00 21.00 0.00 99.00 0.00 0.00 0.00 21.50 0.00 99.00 0.00 0.00 0.00 22.00 0.00 99.00 0.00 0.00 0.00 22.50 0.00 99.00 0.00 0.00 0.00 23.00 0.00 99.00 0.00 0.00 0.00 23.50 0.00 99.00 0.00 0.00 0.00 24.00 0.00 99.00 0.00 0.00 0.00 24.50 0.00 99.00 0.00 0.00 0.00 25.00 0.00 99.00 0.00 0.00 0.00 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 60HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 99.00 0.00 0.00 0.00 99.10 0.03 0.03 0.00 99.20 0.03 0.03 0.00 99.30 0.03 0.03 0.00 99.40 0.03 0.03 0.00 99.50 0.03 0.03 0.00 99.60 0.03 0.03 0.00 99.70 0.04 0.04 0.00 99.80 0.04 0.04 0.00 99.90 0.04 0.04 0.00 100.00 0.04 0.04 0.00 100.10 0.04 0.04 0.00 100.20 0.04 0.04 0.00 100.30 0.04 0.04 0.00 100.40 0.04 0.04 0.00 100.50 0.04 0.04 0.00 100.60 0.04 0.04 0.00 100.70 0.04 0.04 0.00 100.80 0.04 0.04 0.00 100.90 0.05 0.05 0.00 101.00 0.05 0.05 0.00 101.10 0.05 0.05 0.00 101.20 0.05 0.05 0.00 101.30 0.05 0.05 0.00 101.40 0.05 0.05 0.00 101.50 0.05 0.05 0.00 101.60 0.05 0.05 0.00 101.70 0.05 0.05 0.00 101.80 0.05 0.05 0.00 101.90 0.05 0.05 0.00 102.00 0.05 0.05 0.00 102.10 0.06 0.06 0.00 102.20 0.06 0.06 0.00 102.30 0.06 0.06 0.00 102.40 0.06 0.06 0.00 102.50 0.06 0.06 0.00 102.60 0.06 0.06 0.00 102.70 0.06 0.06 0.00 102.80 0.06 0.06 0.00 102.90 0.06 0.06 0.00 103.00 0.06 0.06 0.00 103.10 0.06 0.06 0.00 103.20 0.06 0.06 0.00 103.30 0.07 0.07 0.00 103.40 0.07 0.07 0.00 103.50 0.07 0.07 0.00 103.60 0.07 0.07 0.00 103.70 0.07 0.07 0.00 103.80 0.07 0.07 0.00 103.90 0.07 0.07 0.00 104.00 0.07 0.07 0.00 104.10 0.07 0.07 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 104.20 0.07 0.07 0.00 104.30 0.07 0.07 0.00 104.40 0.07 0.07 0.00 104.50 0.08 0.08 0.00 104.60 0.08 0.08 0.00 104.70 0.08 0.08 0.00 104.80 0.08 0.08 0.00 104.90 1.07 0.08 0.99 105.00 2.87 0.08 2.79 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 61HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 99.00 154 0 99.10 158 8 99.20 163 17 99.30 167 25 99.40 172 33 99.50 176 41 99.60 180 50 99.70 185 58 99.80 189 66 99.90 194 74 100.00 198 83 100.10 202 91 100.20 207 99 100.30 211 107 100.40 216 116 100.50 220 124 100.60 224 132 100.70 229 140 100.80 233 149 100.90 238 157 101.00 242 165 101.10 246 173 101.20 251 182 101.30 255 190 101.40 259 198 101.50 264 207 101.60 268 215 101.70 273 223 101.80 277 231 101.90 281 240 102.00 286 248 102.10 290 256 102.20 295 264 102.30 299 273 102.40 303 281 102.50 308 289 102.60 312 297 102.70 317 306 102.80 321 314 102.90 325 322 103.00 330 330 103.10 334 339 103.20 339 347 103.30 343 355 103.40 347 364 103.50 352 372 103.60 356 380 103.70 361 388 103.80 365 397 103.90 369 405 104.00 374 413 104.10 378 421 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 104.20 383 430 104.30 387 438 104.40 391 446 104.50 396 454 104.60 400 463 104.70 405 471 104.80 409 479 104.90 413 487 105.00 418 496 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 62HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1SW: Grassed Swale Inflow Area = 0.147 ac, 53.13% Impervious, Inflow Depth = 2.26" for 10-Year event Inflow = 0.38 cfs @ 12.09 hrs, Volume= 0.028 af Outflow = 0.03 cfs @ 13.70 hrs, Volume= 0.028 af, Atten= 92%, Lag= 96.2 min Discarded = 0.03 cfs @ 13.70 hrs, Volume= 0.028 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Pond CB1 : One (1) Solid Catch Basin with Hood Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 107.30' @ 13.70 hrs Surf.Area= 554 sf Storage= 524 cf Plug-Flow detention time= 192.2 min calculated for 0.028 af (100% of inflow) Center-of-Mass det. time= 192.2 min ( 1,036.8 - 844.6 ) Volume Invert Avail.Storage Storage Description #1 106.00' 974 cf Custom Stage Data (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 106.00 267 61.0 0 0 267 107.00 478 79.0 367 367 479 107.50 605 89.0 270 638 620 108.00 745 98.0 337 974 761 Device Routing Invert Outlet Devices #1 Discarded 106.00'2.410 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 107.50'24.0" x 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.03 cfs @ 13.70 hrs HW=107.30' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=106.00' TW=105.50' (Dynamic Tailwater) 2=Orifice/Grate ( Controls 0.00 cfs) Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 63HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.147 ac Peak Elev=107.30' Storage=524 cf 0.38 cfs 0.03 cfs 0.03 cfs 0.00 cfs Pond 1SW: Grassed Swale Total Discarded Primary Stage-Discharge Discharge (cfs) 9876543210 El e v a t i o n ( f e e t ) 108 107 106 Exfiltration Orifice/Grate Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 64HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale Surface Wetted Storage Stage-Area-Storage Storage (cubic-feet) 9008007006005004003002001000 Surface/Horizontal/Wetted Area (sq-ft) 7006005004003002001000 El e v a t i o n ( f e e t ) 108 107 106 Custom Stage Data Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 65HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1SW: Grassed Swale Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 106.00 0.00 0.00 0.00 0.50 0.00 0 106.00 0.00 0.00 0.00 1.00 0.00 0 106.00 0.00 0.00 0.00 1.50 0.00 0 106.00 0.00 0.00 0.00 2.00 0.00 0 106.00 0.00 0.00 0.00 2.50 0.00 0 106.00 0.00 0.00 0.00 3.00 0.00 0 106.00 0.00 0.00 0.00 3.50 0.00 0 106.00 0.00 0.00 0.00 4.00 0.00 0 106.00 0.00 0.00 0.00 4.50 0.00 0 106.00 0.00 0.00 0.00 5.00 0.00 0 106.00 0.00 0.00 0.00 5.50 0.00 0 106.00 0.00 0.00 0.00 6.00 0.00 0 106.00 0.00 0.00 0.00 6.50 0.00 0 106.00 0.00 0.00 0.00 7.00 0.00 0 106.00 0.00 0.00 0.00 7.50 0.00 0 106.00 0.00 0.00 0.00 8.00 0.00 0 106.00 0.00 0.00 0.00 8.50 0.00 0 106.00 0.00 0.00 0.00 9.00 0.00 0 106.00 0.00 0.00 0.00 9.50 0.00 0 106.00 0.00 0.00 0.00 10.00 0.00 0 106.00 0.00 0.00 0.00 10.50 0.01 1 106.00 0.00 0.00 0.00 11.00 0.01 2 106.01 0.01 0.01 0.00 11.50 0.02 5 106.02 0.02 0.02 0.00 12.00 0.21 110 106.37 0.02 0.02 0.00 12.50 0.10 466 107.20 0.03 0.03 0.00 13.00 0.04 514 107.29 0.03 0.03 0.00 13.50 0.03 524 107.30 0.03 0.03 0.00 14.00 0.03 522 107.30 0.03 0.03 0.00 14.50 0.02 513 107.28 0.03 0.03 0.00 15.00 0.02 498 107.26 0.03 0.03 0.00 15.50 0.02 480 107.22 0.03 0.03 0.00 16.00 0.02 456 107.18 0.03 0.03 0.00 16.50 0.01 430 107.13 0.03 0.03 0.00 17.00 0.01 403 107.07 0.03 0.03 0.00 17.50 0.01 374 107.01 0.03 0.03 0.00 18.00 0.01 345 106.95 0.03 0.03 0.00 18.50 0.01 315 106.89 0.03 0.03 0.00 19.00 0.01 286 106.82 0.02 0.02 0.00 19.50 0.01 258 106.76 0.02 0.02 0.00 20.00 0.01 230 106.69 0.02 0.02 0.00 20.50 0.01 204 106.62 0.02 0.02 0.00 21.00 0.01 178 106.56 0.02 0.02 0.00 21.50 0.01 153 106.49 0.02 0.02 0.00 22.00 0.01 129 106.42 0.02 0.02 0.00 22.50 0.01 106 106.35 0.02 0.02 0.00 23.00 0.01 84 106.28 0.02 0.02 0.00 23.50 0.01 62 106.22 0.02 0.02 0.00 24.00 0.01 41 106.15 0.02 0.02 0.00 24.50 0.00 14 106.05 0.02 0.02 0.00 25.00 0.00 0 106.00 0.00 0.00 0.00 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 66HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1SW: Grassed Swale Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 106.00 0.00 0.00 0.00 106.02 0.02 0.02 0.00 106.04 0.02 0.02 0.00 106.06 0.02 0.02 0.00 106.08 0.02 0.02 0.00 106.10 0.02 0.02 0.00 106.12 0.02 0.02 0.00 106.14 0.02 0.02 0.00 106.16 0.02 0.02 0.00 106.18 0.02 0.02 0.00 106.20 0.02 0.02 0.00 106.22 0.02 0.02 0.00 106.24 0.02 0.02 0.00 106.26 0.02 0.02 0.00 106.28 0.02 0.02 0.00 106.30 0.02 0.02 0.00 106.32 0.02 0.02 0.00 106.34 0.02 0.02 0.00 106.36 0.02 0.02 0.00 106.38 0.02 0.02 0.00 106.40 0.02 0.02 0.00 106.42 0.02 0.02 0.00 106.44 0.02 0.02 0.00 106.46 0.02 0.02 0.00 106.48 0.02 0.02 0.00 106.50 0.02 0.02 0.00 106.52 0.02 0.02 0.00 106.54 0.02 0.02 0.00 106.56 0.02 0.02 0.00 106.58 0.02 0.02 0.00 106.60 0.02 0.02 0.00 106.62 0.02 0.02 0.00 106.64 0.02 0.02 0.00 106.66 0.02 0.02 0.00 106.68 0.02 0.02 0.00 106.70 0.02 0.02 0.00 106.72 0.02 0.02 0.00 106.74 0.02 0.02 0.00 106.76 0.02 0.02 0.00 106.78 0.02 0.02 0.00 106.80 0.02 0.02 0.00 106.82 0.02 0.02 0.00 106.84 0.02 0.02 0.00 106.86 0.02 0.02 0.00 106.88 0.03 0.03 0.00 106.90 0.03 0.03 0.00 106.92 0.03 0.03 0.00 106.94 0.03 0.03 0.00 106.96 0.03 0.03 0.00 106.98 0.03 0.03 0.00 107.00 0.03 0.03 0.00 107.02 0.03 0.03 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 107.04 0.03 0.03 0.00 107.06 0.03 0.03 0.00 107.08 0.03 0.03 0.00 107.10 0.03 0.03 0.00 107.12 0.03 0.03 0.00 107.14 0.03 0.03 0.00 107.16 0.03 0.03 0.00 107.18 0.03 0.03 0.00 107.20 0.03 0.03 0.00 107.22 0.03 0.03 0.00 107.24 0.03 0.03 0.00 107.26 0.03 0.03 0.00 107.28 0.03 0.03 0.00 107.30 0.03 0.03 0.00 107.32 0.03 0.03 0.00 107.34 0.03 0.03 0.00 107.36 0.03 0.03 0.00 107.38 0.03 0.03 0.00 107.40 0.03 0.03 0.00 107.42 0.03 0.03 0.00 107.44 0.03 0.03 0.00 107.46 0.03 0.03 0.00 107.48 0.03 0.03 0.00 107.50 0.03 0.03 0.00 107.52 0.11 0.03 0.07 107.54 0.24 0.04 0.21 107.56 0.42 0.04 0.38 107.58 0.63 0.04 0.59 107.60 0.86 0.04 0.83 107.62 1.12 0.04 1.09 107.64 1.41 0.04 1.37 107.66 1.71 0.04 1.67 107.68 2.04 0.04 2.00 107.70 2.38 0.04 2.34 107.72 2.74 0.04 2.70 107.74 3.11 0.04 3.08 107.76 3.51 0.04 3.47 107.78 3.91 0.04 3.88 107.80 4.34 0.04 4.30 107.82 4.78 0.04 4.74 107.84 5.23 0.04 5.19 107.86 5.69 0.04 5.65 107.88 6.17 0.04 6.13 107.90 6.66 0.04 6.62 107.92 7.16 0.04 7.12 107.94 7.68 0.04 7.64 107.96 8.20 0.04 8.16 107.98 8.74 0.04 8.70 108.00 9.29 0.04 9.25 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 67HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1SW: Grassed Swale Elevation (feet) Surface (sq-ft) Wetted (sq-ft) Storage (cubic-feet) 106.00 267 267 0 106.05 276 276 14 106.10 285 286 28 106.15 295 295 42 106.20 304 305 57 106.25 314 315 73 106.30 324 325 88 106.35 334 335 105 106.40 344 345 122 106.45 354 356 139 106.50 365 366 157 106.55 376 377 176 106.60 386 388 195 106.65 397 399 214 106.70 408 410 235 106.75 420 421 255 106.80 431 433 277 106.85 442 444 298 106.90 454 456 321 106.95 466 467 344 107.00 478 479 367 107.05 490 493 392 107.10 502 506 416 107.15 515 520 442 107.20 527 533 468 107.25 540 547 495 107.30 552 561 522 107.35 565 576 550 107.40 578 590 578 107.45 592 605 608 107.50 605 620 638 107.55 618 633 668 107.60 632 647 699 107.65 645 661 731 107.70 659 675 764 107.75 673 689 797 107.80 687 703 831 107.85 701 717 866 107.90 716 732 901 107.95 730 747 938 108.00 745 761 974 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 68HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Inflow Area = 0.249 ac, 58.50% Impervious, Inflow Depth = 2.43" for 10-Year event Inflow = 0.71 cfs @ 12.09 hrs, Volume= 0.050 af Outflow = 0.13 cfs @ 12.56 hrs, Volume= 0.050 af, Atten= 81%, Lag= 28.3 min Discarded = 0.13 cfs @ 12.56 hrs, Volume= 0.050 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach 4R : Post-Discharge Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 101.74' @ 12.56 hrs Surf.Area= 432 sf Storage= 643 cf Plug-Flow detention time= 37.0 min calculated for 0.050 af (100% of inflow) Center-of-Mass det. time= 37.0 min ( 876.6 - 839.6 ) Volume Invert Avail.Storage Storage Description #1 99.00' 898 cf 12.00'W x 36.00'L x 6.00'H Prismatoid 2,592 cf Overall - 597 cf Embedded = 1,995 cf x 45.0% Voids #2 99.00' 509 cf 6.00'D x 6.00'H Vertical Cone/Cylinder x 3 Inside #1 597 cf Overall - 3.0" Wall Thickness = 509 cf 1,407 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 99.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 104.80'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.13 cfs @ 12.56 hrs HW=101.74' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.13 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=99.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 69HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.249 ac Peak Elev=101.74' Storage=643 cf 0.71 cfs 0.13 cfs 0.13 cfs 0.00 cfs Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Exfiltration Broad-Crested Rectangular Weir Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 70HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Wetted Storage Stage-Area-Storage Storage (cubic-feet) 1,4001,2001,0008006004002000 Surface/Horizontal/Wetted Area (sq-ft) 1,0009008007006005004003002001000 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Prismatoid + Vertical Cone/Cylinder Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 71HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 99.00 0.00 0.00 0.00 0.50 0.00 0 99.00 0.00 0.00 0.00 1.00 0.00 0 99.00 0.00 0.00 0.00 1.50 0.00 0 99.00 0.00 0.00 0.00 2.00 0.00 0 99.00 0.00 0.00 0.00 2.50 0.00 0 99.00 0.00 0.00 0.00 3.00 0.00 0 99.00 0.00 0.00 0.00 3.50 0.00 0 99.00 0.00 0.00 0.00 4.00 0.00 0 99.00 0.00 0.00 0.00 4.50 0.00 0 99.00 0.00 0.00 0.00 5.00 0.00 0 99.00 0.00 0.00 0.00 5.50 0.00 0 99.00 0.00 0.00 0.00 6.00 0.00 0 99.00 0.00 0.00 0.00 6.50 0.00 0 99.00 0.00 0.00 0.00 7.00 0.00 0 99.00 0.00 0.00 0.00 7.50 0.00 0 99.00 0.00 0.00 0.00 8.00 0.00 0 99.00 0.00 0.00 0.00 8.50 0.00 0 99.00 0.00 0.00 0.00 9.00 0.00 0 99.00 0.00 0.00 0.00 9.50 0.00 0 99.00 0.00 0.00 0.00 10.00 0.01 0 99.00 0.01 0.01 0.00 10.50 0.01 0 99.00 0.01 0.01 0.00 11.00 0.02 1 99.00 0.02 0.02 0.00 11.50 0.04 1 99.01 0.04 0.04 0.00 12.00 0.39 121 99.52 0.09 0.09 0.00 12.50 0.18 638 101.72 0.13 0.13 0.00 13.00 0.08 586 101.50 0.13 0.13 0.00 13.50 0.06 479 101.04 0.12 0.12 0.00 14.00 0.05 369 100.57 0.11 0.11 0.00 14.50 0.04 258 100.10 0.10 0.10 0.00 15.00 0.04 153 99.65 0.09 0.09 0.00 15.50 0.03 53 99.23 0.09 0.09 0.00 16.00 0.03 1 99.00 0.03 0.03 0.00 16.50 0.02 1 99.00 0.02 0.02 0.00 17.00 0.02 1 99.00 0.02 0.02 0.00 17.50 0.02 1 99.00 0.02 0.02 0.00 18.00 0.02 0 99.00 0.02 0.02 0.00 18.50 0.02 0 99.00 0.02 0.02 0.00 19.00 0.01 0 99.00 0.01 0.01 0.00 19.50 0.01 0 99.00 0.01 0.01 0.00 20.00 0.01 0 99.00 0.01 0.01 0.00 20.50 0.01 0 99.00 0.01 0.01 0.00 21.00 0.01 0 99.00 0.01 0.01 0.00 21.50 0.01 0 99.00 0.01 0.01 0.00 22.00 0.01 0 99.00 0.01 0.01 0.00 22.50 0.01 0 99.00 0.01 0.01 0.00 23.00 0.01 0 99.00 0.01 0.01 0.00 23.50 0.01 0 99.00 0.01 0.01 0.00 24.00 0.01 0 99.00 0.01 0.01 0.00 24.50 0.00 0 99.00 0.00 0.00 0.00 25.00 0.00 0 99.00 0.00 0.00 0.00 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 72HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 99.00 0.00 0.00 0.00 99.10 0.08 0.08 0.00 99.20 0.09 0.09 0.00 99.30 0.09 0.09 0.00 99.40 0.09 0.09 0.00 99.50 0.09 0.09 0.00 99.60 0.09 0.09 0.00 99.70 0.10 0.10 0.00 99.80 0.10 0.10 0.00 99.90 0.10 0.10 0.00 100.00 0.10 0.10 0.00 100.10 0.10 0.10 0.00 100.20 0.10 0.10 0.00 100.30 0.11 0.11 0.00 100.40 0.11 0.11 0.00 100.50 0.11 0.11 0.00 100.60 0.11 0.11 0.00 100.70 0.11 0.11 0.00 100.80 0.12 0.12 0.00 100.90 0.12 0.12 0.00 101.00 0.12 0.12 0.00 101.10 0.12 0.12 0.00 101.20 0.12 0.12 0.00 101.30 0.12 0.12 0.00 101.40 0.13 0.13 0.00 101.50 0.13 0.13 0.00 101.60 0.13 0.13 0.00 101.70 0.13 0.13 0.00 101.80 0.13 0.13 0.00 101.90 0.14 0.14 0.00 102.00 0.14 0.14 0.00 102.10 0.14 0.14 0.00 102.20 0.14 0.14 0.00 102.30 0.14 0.14 0.00 102.40 0.15 0.15 0.00 102.50 0.15 0.15 0.00 102.60 0.15 0.15 0.00 102.70 0.15 0.15 0.00 102.80 0.15 0.15 0.00 102.90 0.15 0.15 0.00 103.00 0.16 0.16 0.00 103.10 0.16 0.16 0.00 103.20 0.16 0.16 0.00 103.30 0.16 0.16 0.00 103.40 0.16 0.16 0.00 103.50 0.17 0.17 0.00 103.60 0.17 0.17 0.00 103.70 0.17 0.17 0.00 103.80 0.17 0.17 0.00 103.90 0.17 0.17 0.00 104.00 0.17 0.17 0.00 104.10 0.18 0.18 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 104.20 0.18 0.18 0.00 104.30 0.18 0.18 0.00 104.40 0.18 0.18 0.00 104.50 0.18 0.18 0.00 104.60 0.19 0.19 0.00 104.70 0.19 0.19 0.00 104.80 0.19 0.19 0.00 104.90 1.18 0.19 0.99 105.00 2.98 0.19 2.79 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 73HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 99.00 432 0 99.10 442 23 99.20 451 47 99.30 461 70 99.40 470 94 99.50 480 117 99.60 490 141 99.70 499 164 99.80 509 188 99.90 518 211 100.00 528 234 100.10 538 258 100.20 547 281 100.30 557 305 100.40 566 328 100.50 576 352 100.60 586 375 100.70 595 399 100.80 605 422 100.90 614 445 101.00 624 469 101.10 634 492 101.20 643 516 101.30 653 539 101.40 662 563 101.50 672 586 101.60 682 610 101.70 691 633 101.80 701 656 101.90 710 680 102.00 720 703 102.10 730 727 102.20 739 750 102.30 749 774 102.40 758 797 102.50 768 820 102.60 778 844 102.70 787 867 102.80 797 891 102.90 806 914 103.00 816 938 103.10 826 961 103.20 835 985 103.30 845 1,008 103.40 854 1,031 103.50 864 1,055 103.60 874 1,078 103.70 883 1,102 103.80 893 1,125 103.90 902 1,149 104.00 912 1,172 104.10 922 1,196 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 104.20 931 1,219 104.30 941 1,242 104.40 950 1,266 104.50 960 1,289 104.60 970 1,313 104.70 979 1,336 104.80 989 1,360 104.90 998 1,383 105.00 1,008 1,407 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 74HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB1: One (1) Solid Catch Basin with Hood Inflow Area = 0.147 ac, 53.13% Impervious, Inflow Depth = 0.00" for 10-Year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Pond 1P : (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 105.50' @ 0.00 hrs Flood Elev= 107.50' Device Routing Invert Outlet Devices #1 Primary 105.50'12.0" Round Culvert L= 20.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 105.50' / 105.00' S= 0.0250 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.79 sf Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=105.50' TW=99.00' (Dynamic Tailwater) 1=Culvert ( Controls 0.00 cfs) Pond CB1: One (1) Solid Catch Basin with Hood Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.147 ac Peak Elev=105.50' 12.0" Round Culvert n=0.020 L=20.0' S=0.0250 '/' 0.00 cfs 0.00 cfs Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 75HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB1: One (1) Solid Catch Basin with Hood Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 107 106 Culvert Pond CB1: One (1) Solid Catch Basin with Hood Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 107 106 Flood Elevation Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 76HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB1: One (1) Solid Catch Basin with Hood Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 105.50 0.00 0.50 0.00 105.50 0.00 1.00 0.00 105.50 0.00 1.50 0.00 105.50 0.00 2.00 0.00 105.50 0.00 2.50 0.00 105.50 0.00 3.00 0.00 105.50 0.00 3.50 0.00 105.50 0.00 4.00 0.00 105.50 0.00 4.50 0.00 105.50 0.00 5.00 0.00 105.50 0.00 5.50 0.00 105.50 0.00 6.00 0.00 105.50 0.00 6.50 0.00 105.50 0.00 7.00 0.00 105.50 0.00 7.50 0.00 105.50 0.00 8.00 0.00 105.50 0.00 8.50 0.00 105.50 0.00 9.00 0.00 105.50 0.00 9.50 0.00 105.50 0.00 10.00 0.00 105.50 0.00 10.50 0.00 105.50 0.00 11.00 0.00 105.50 0.00 11.50 0.00 105.50 0.00 12.00 0.00 105.50 0.00 12.50 0.00 105.50 0.00 13.00 0.00 105.50 0.00 13.50 0.00 105.50 0.00 14.00 0.00 105.50 0.00 14.50 0.00 105.50 0.00 15.00 0.00 105.50 0.00 15.50 0.00 105.50 0.00 16.00 0.00 105.50 0.00 16.50 0.00 105.50 0.00 17.00 0.00 105.50 0.00 17.50 0.00 105.50 0.00 18.00 0.00 105.50 0.00 18.50 0.00 105.50 0.00 19.00 0.00 105.50 0.00 19.50 0.00 105.50 0.00 20.00 0.00 105.50 0.00 20.50 0.00 105.50 0.00 21.00 0.00 105.50 0.00 21.50 0.00 105.50 0.00 22.00 0.00 105.50 0.00 22.50 0.00 105.50 0.00 23.00 0.00 105.50 0.00 23.50 0.00 105.50 0.00 24.00 0.00 105.50 0.00 24.50 0.00 105.50 0.00 25.00 0.00 105.50 0.00 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 77HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB1: One (1) Solid Catch Basin with Hood Elevation (feet) Primary (cfs) 105.50 0.00 105.51 0.00 105.52 0.00 105.53 0.00 105.54 0.01 105.55 0.01 105.56 0.01 105.57 0.02 105.58 0.02 105.59 0.03 105.60 0.03 105.61 0.04 105.62 0.05 105.63 0.06 105.64 0.07 105.65 0.08 105.66 0.09 105.67 0.10 105.68 0.11 105.69 0.12 105.70 0.13 105.71 0.15 105.72 0.16 105.73 0.18 105.74 0.19 105.75 0.21 105.76 0.22 105.77 0.24 105.78 0.26 105.79 0.27 105.80 0.29 105.81 0.31 105.82 0.33 105.83 0.35 105.84 0.37 105.85 0.39 105.86 0.41 105.87 0.43 105.88 0.45 105.89 0.48 105.90 0.50 105.91 0.52 105.92 0.55 105.93 0.57 105.94 0.59 105.95 0.62 105.96 0.64 105.97 0.67 105.98 0.69 105.99 0.72 106.00 0.75 106.01 0.77 Elevation (feet) Primary (cfs) 106.02 0.80 106.03 0.83 106.04 0.85 106.05 0.88 106.06 0.91 106.07 0.94 106.08 0.97 106.09 1.00 106.10 1.02 106.11 1.05 106.12 1.08 106.13 1.11 106.14 1.14 106.15 1.17 106.16 1.20 106.17 1.23 106.18 1.26 106.19 1.29 106.20 1.32 106.21 1.35 106.22 1.38 106.23 1.41 106.24 1.44 106.25 1.47 106.26 1.50 106.27 1.53 106.28 1.56 106.29 1.59 106.30 1.62 106.31 1.65 106.32 1.68 106.33 1.71 106.34 1.74 106.35 1.76 106.36 1.79 106.37 1.82 106.38 1.85 106.39 1.87 106.40 1.90 106.41 1.92 106.42 1.95 106.43 1.97 106.44 2.00 106.45 2.02 106.46 2.04 106.47 2.06 106.48 2.08 106.49 2.10 106.50 2.11 106.51 2.13 106.52 2.15 106.53 2.17 Elevation (feet) Primary (cfs) 106.54 2.19 106.55 2.21 106.56 2.23 106.57 2.25 106.58 2.27 106.59 2.29 106.60 2.31 106.61 2.33 106.62 2.35 106.63 2.37 106.64 2.39 106.65 2.41 106.66 2.43 106.67 2.44 106.68 2.46 106.69 2.48 106.70 2.50 106.71 2.52 106.72 2.53 106.73 2.55 106.74 2.57 106.75 2.59 106.76 2.60 106.77 2.62 106.78 2.64 106.79 2.65 106.80 2.67 106.81 2.69 106.82 2.70 106.83 2.72 106.84 2.74 106.85 2.75 106.86 2.77 106.87 2.78 106.88 2.80 106.89 2.82 106.90 2.83 106.91 2.85 106.92 2.86 106.93 2.88 106.94 2.89 106.95 2.91 106.96 2.93 106.97 2.94 106.98 2.96 106.99 2.97 107.00 2.99 107.01 3.00 107.02 3.02 107.03 3.03 107.04 3.04 107.05 3.06 Elevation (feet) Primary (cfs) 107.06 3.07 107.07 3.09 107.08 3.10 107.09 3.12 107.10 3.13 107.11 3.15 107.12 3.16 107.13 3.17 107.14 3.19 107.15 3.20 107.16 3.22 107.17 3.23 107.18 3.24 107.19 3.26 107.20 3.27 107.21 3.28 107.22 3.30 107.23 3.31 107.24 3.32 107.25 3.34 107.26 3.35 107.27 3.36 107.28 3.38 107.29 3.39 107.30 3.40 107.31 3.42 107.32 3.43 107.33 3.44 107.34 3.46 107.35 3.47 107.36 3.48 107.37 3.49 107.38 3.51 107.39 3.52 107.40 3.53 107.41 3.55 107.42 3.56 107.43 3.57 107.44 3.58 107.45 3.60 107.46 3.61 107.47 3.62 107.48 3.63 107.49 3.64 107.50 3.66 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 78HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB1: One (1) Solid Catch Basin with Hood Elevation (feet) Storage (acre-feet) 105.50 0.000 105.52 0.000 105.54 0.000 105.56 0.000 105.58 0.000 105.60 0.000 105.62 0.000 105.64 0.000 105.66 0.000 105.68 0.000 105.70 0.000 105.72 0.000 105.74 0.000 105.76 0.000 105.78 0.000 105.80 0.000 105.82 0.000 105.84 0.000 105.86 0.000 105.88 0.000 105.90 0.000 105.92 0.000 105.94 0.000 105.96 0.000 105.98 0.000 106.00 0.000 106.02 0.000 106.04 0.000 106.06 0.000 106.08 0.000 106.10 0.000 106.12 0.000 106.14 0.000 106.16 0.000 106.18 0.000 106.20 0.000 106.22 0.000 106.24 0.000 106.26 0.000 106.28 0.000 106.30 0.000 106.32 0.000 106.34 0.000 106.36 0.000 106.38 0.000 106.40 0.000 106.42 0.000 106.44 0.000 106.46 0.000 106.48 0.000 106.50 0.000 106.52 0.000 Elevation (feet) Storage (acre-feet) 106.54 0.000 106.56 0.000 106.58 0.000 106.60 0.000 106.62 0.000 106.64 0.000 106.66 0.000 106.68 0.000 106.70 0.000 106.72 0.000 106.74 0.000 106.76 0.000 106.78 0.000 106.80 0.000 106.82 0.000 106.84 0.000 106.86 0.000 106.88 0.000 106.90 0.000 106.92 0.000 106.94 0.000 106.96 0.000 106.98 0.000 107.00 0.000 107.02 0.000 107.04 0.000 107.06 0.000 107.08 0.000 107.10 0.000 107.12 0.000 107.14 0.000 107.16 0.000 107.18 0.000 107.20 0.000 107.22 0.000 107.24 0.000 107.26 0.000 107.28 0.000 107.30 0.000 107.32 0.000 107.34 0.000 107.36 0.000 107.38 0.000 107.40 0.000 107.42 0.000 107.44 0.000 107.46 0.000 107.48 0.000 107.50 0.000 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 79HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB2: Pool Drain and Roof Leaders Inflow Area = 0.249 ac, 58.50% Impervious, Inflow Depth = 2.43" for 10-Year event Inflow = 0.71 cfs @ 12.09 hrs, Volume= 0.050 af Outflow = 0.71 cfs @ 12.09 hrs, Volume= 0.050 af, Atten= 0%, Lag= 0.0 min Primary = 0.71 cfs @ 12.09 hrs, Volume= 0.050 af Routed to Pond 2P : (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 110.80' @ 12.09 hrs Flood Elev= 111.00' Device Routing Invert Outlet Devices #1 Primary 110.50'6.0" Round Culvert X 4.00 L= 50.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 110.50' / 105.00' S= 0.1100 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.20 sf Primary OutFlow Max=0.70 cfs @ 12.09 hrs HW=110.80' TW=100.19' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.70 cfs @ 1.46 fps) Pond CB2: Pool Drain and Roof Leaders Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.249 ac Peak Elev=110.80' 6.0" Round Culvert x 4.00 n=0.020 L=50.0' S=0.1100 '/' 0.71 cfs 0.71 cfs Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 80HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB2: Pool Drain and Roof Leaders Primary Stage-Discharge Discharge (cfs) 10 El e v a t i o n ( f e e t ) 111 110.98 110.96 110.94 110.92 110.9 110.88 110.86 110.84 110.82 110.8 110.78 110.76 110.74 110.72 110.7 110.68 110.66 110.64 110.62 110.6 110.58 110.56 110.54 110.52 110.5 Culvert Pond CB2: Pool Drain and Roof Leaders Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 111 110.98 110.96 110.94 110.92 110.9 110.88 110.86 110.84 110.82 110.8 110.78 110.76 110.74 110.72 110.7 110.68 110.66 110.64 110.62 110.6 110.58 110.56 110.54 110.52 110.5 Flood Elevation Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 81HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB2: Pool Drain and Roof Leaders Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 110.50 0.00 0.50 0.00 110.50 0.00 1.00 0.00 110.50 0.00 1.50 0.00 110.50 0.00 2.00 0.00 110.50 0.00 2.50 0.00 110.50 0.00 3.00 0.00 110.50 0.00 3.50 0.00 110.50 0.00 4.00 0.00 110.50 0.00 4.50 0.00 110.50 0.00 5.00 0.00 110.50 0.00 5.50 0.00 110.50 0.00 6.00 0.00 110.50 0.00 6.50 0.00 110.50 0.00 7.00 0.00 110.50 0.00 7.50 0.00 110.50 0.00 8.00 0.00 110.50 0.00 8.50 0.00 110.50 0.00 9.00 0.00 110.50 0.00 9.50 0.00 110.52 0.00 10.00 0.01 110.52 0.01 10.50 0.01 110.53 0.01 11.00 0.02 110.55 0.02 11.50 0.04 110.57 0.04 12.00 0.39 110.71 0.39 12.50 0.18 110.64 0.18 13.00 0.08 110.59 0.08 13.50 0.06 110.58 0.06 14.00 0.05 110.57 0.05 14.50 0.04 110.57 0.04 15.00 0.04 110.56 0.04 15.50 0.03 110.56 0.03 16.00 0.03 110.55 0.03 16.50 0.02 110.55 0.02 17.00 0.02 110.55 0.02 17.50 0.02 110.54 0.02 18.00 0.02 110.54 0.02 18.50 0.02 110.54 0.02 19.00 0.01 110.54 0.01 19.50 0.01 110.54 0.01 20.00 0.01 110.54 0.01 20.50 0.01 110.54 0.01 21.00 0.01 110.54 0.01 21.50 0.01 110.53 0.01 22.00 0.01 110.53 0.01 22.50 0.01 110.53 0.01 23.00 0.01 110.53 0.01 23.50 0.01 110.53 0.01 24.00 0.01 110.53 0.01 24.50 0.00 110.50 0.00 25.00 0.00 110.50 0.00 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 82HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB2: Pool Drain and Roof Leaders Elevation (feet) Primary (cfs) 110.50 0.00 110.51 0.00 110.52 0.00 110.53 0.01 110.54 0.02 110.55 0.02 110.56 0.04 110.57 0.05 110.58 0.06 110.59 0.08 110.60 0.10 110.61 0.11 110.62 0.13 110.63 0.16 110.64 0.18 110.65 0.21 110.66 0.23 110.67 0.26 110.68 0.29 110.69 0.32 110.70 0.35 110.71 0.39 110.72 0.42 110.73 0.45 110.74 0.49 110.75 0.53 110.76 0.57 110.77 0.60 110.78 0.64 110.79 0.68 110.80 0.72 110.81 0.77 110.82 0.81 110.83 0.85 110.84 0.89 110.85 0.93 110.86 0.98 110.87 1.02 110.88 1.06 110.89 1.10 110.90 1.15 110.91 1.19 110.92 1.23 110.93 1.27 110.94 1.31 110.95 1.34 110.96 1.38 110.97 1.41 110.98 1.44 110.99 1.47 111.00 1.49 Type III 24-hr 10-Year Rainfall=5.30"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 83HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB2: Pool Drain and Roof Leaders Elevation (feet) Storage (acre-feet) 110.50 0.000 110.51 0.000 110.52 0.000 110.53 0.000 110.54 0.000 110.55 0.000 110.56 0.000 110.57 0.000 110.58 0.000 110.59 0.000 110.60 0.000 110.61 0.000 110.62 0.000 110.63 0.000 110.64 0.000 110.65 0.000 110.66 0.000 110.67 0.000 110.68 0.000 110.69 0.000 110.70 0.000 110.71 0.000 110.72 0.000 110.73 0.000 110.74 0.000 110.75 0.000 110.76 0.000 110.77 0.000 110.78 0.000 110.79 0.000 110.80 0.000 110.81 0.000 110.82 0.000 110.83 0.000 110.84 0.000 110.85 0.000 110.86 0.000 110.87 0.000 110.88 0.000 110.89 0.000 110.90 0.000 110.91 0.000 110.92 0.000 110.93 0.000 110.94 0.000 110.95 0.000 110.96 0.000 110.97 0.000 110.98 0.000 110.99 0.000 111.00 0.000 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 84HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1Ex: Existing Project Area Runoff = 0.35 cfs @ 12.12 hrs, Volume= 0.042 af, Depth= 0.87" Routed to Reach 1Dis : Pre- Dev Peak Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 25-Year Rainfall=6.50" Area (sf) CN Description * 4,410 98 Driveway/House/Pool, HSG A 2,500 39 >75% Grass cover, Good, HSG A 18,214 30 Woods, Good, HSG A 25,124 43 Weighted Average 20,714 82.45% Pervious Area 4,410 17.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1Ex: Existing Project Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 25-Year Rainfall=6.50" Runoff Area=25,124 sf Runoff Volume=0.042 af Runoff Depth=0.87" Tc=6.0 min CN=43 0.35 cfs Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 85HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1Ex: Existing Project Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.07 0.00 0.00 1.50 0.10 0.00 0.00 2.00 0.13 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.20 0.00 0.00 3.50 0.24 0.00 0.00 4.00 0.28 0.00 0.00 4.50 0.32 0.00 0.00 5.00 0.37 0.00 0.00 5.50 0.42 0.00 0.00 6.00 0.47 0.00 0.00 6.50 0.52 0.00 0.00 7.00 0.59 0.00 0.00 7.50 0.66 0.00 0.00 8.00 0.74 0.00 0.00 8.50 0.83 0.00 0.00 9.00 0.95 0.00 0.00 9.50 1.08 0.00 0.00 10.00 1.23 0.00 0.00 10.50 1.41 0.00 0.00 11.00 1.63 0.00 0.00 11.50 1.94 0.00 0.00 12.00 3.25 0.03 0.05 12.50 4.56 0.24 0.17 13.00 4.87 0.32 0.08 13.50 5.09 0.38 0.07 14.00 5.27 0.43 0.06 14.50 5.42 0.48 0.05 15.00 5.55 0.52 0.05 15.50 5.67 0.56 0.04 16.00 5.76 0.59 0.04 16.50 5.84 0.62 0.03 17.00 5.91 0.64 0.03 17.50 5.98 0.67 0.03 18.00 6.03 0.69 0.02 18.50 6.08 0.71 0.02 19.00 6.13 0.72 0.02 19.50 6.18 0.74 0.02 20.00 6.22 0.76 0.02 20.50 6.26 0.77 0.02 21.00 6.30 0.79 0.02 21.50 6.34 0.80 0.02 22.00 6.37 0.82 0.02 22.50 6.41 0.83 0.02 23.00 6.44 0.84 0.01 23.50 6.47 0.85 0.01 24.00 6.50 0.87 0.01 24.50 6.50 0.87 0.00 25.00 6.50 0.87 0.00 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 86HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Driveway Area with Landscape Runoff = 0.55 cfs @ 12.09 hrs, Volume= 0.039 af, Depth= 3.21" Routed to Pond 1SW : Grassed Swale Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 25-Year Rainfall=6.50" Area (sf) CN Description * 3,400 98 Driveway/House/Pool, HSG A 3,000 39 >75% Grass cover, Good, HSG A 6,400 70 Weighted Average 3,000 46.88% Pervious Area 3,400 53.13% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1S: Driveway Area with Landscape Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 25-Year Rainfall=6.50" Runoff Area=6,400 sf Runoff Volume=0.039 af Runoff Depth=3.21" Tc=6.0 min CN=70 0.55 cfs Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 87HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: Driveway Area with Landscape Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.07 0.00 0.00 1.50 0.10 0.00 0.00 2.00 0.13 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.20 0.00 0.00 3.50 0.24 0.00 0.00 4.00 0.28 0.00 0.00 4.50 0.32 0.00 0.00 5.00 0.37 0.00 0.00 5.50 0.42 0.00 0.00 6.00 0.47 0.00 0.00 6.50 0.52 0.00 0.00 7.00 0.59 0.00 0.00 7.50 0.66 0.00 0.00 8.00 0.74 0.00 0.00 8.50 0.83 0.00 0.00 9.00 0.95 0.00 0.00 9.50 1.08 0.01 0.00 10.00 1.23 0.03 0.01 10.50 1.41 0.06 0.01 11.00 1.63 0.12 0.02 11.50 1.94 0.22 0.04 12.00 3.25 0.86 0.31 12.50 4.56 1.72 0.14 13.00 4.87 1.94 0.06 13.50 5.09 2.11 0.05 14.00 5.27 2.24 0.04 14.50 5.42 2.35 0.03 15.00 5.55 2.45 0.03 15.50 5.67 2.54 0.02 16.00 5.76 2.62 0.02 16.50 5.84 2.68 0.02 17.00 5.91 2.74 0.02 17.50 5.98 2.79 0.01 18.00 6.03 2.83 0.01 18.50 6.08 2.87 0.01 19.00 6.13 2.91 0.01 19.50 6.18 2.95 0.01 20.00 6.22 2.98 0.01 20.50 6.26 3.01 0.01 21.00 6.30 3.05 0.01 21.50 6.34 3.08 0.01 22.00 6.37 3.11 0.01 22.50 6.41 3.13 0.01 23.00 6.44 3.16 0.01 23.50 6.47 3.18 0.01 24.00 6.50 3.21 0.01 24.50 6.50 3.21 0.00 25.00 6.50 3.21 0.00 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 88HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: House Roof Area & Patio Runoff = 0.99 cfs @ 12.09 hrs, Volume= 0.071 af, Depth= 3.41" Routed to Pond CB2 : Pool Drain and Roof Leaders Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 25-Year Rainfall=6.50" Area (sf) CN Description * 4,443 98 House Area * 1,900 98 Patio-Pool Area 2,500 39 >75% Grass cover, Good, HSG A 2,000 30 Woods, Good, HSG A 10,843 72 Weighted Average 4,500 41.50% Pervious Area 6,343 58.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 2S: House Roof Area & Patio Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Type III 24-hr 25-Year Rainfall=6.50" Runoff Area=10,843 sf Runoff Volume=0.071 af Runoff Depth=3.41" Tc=6.0 min CN=72 0.99 cfs Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 89HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: House Roof Area & Patio Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.07 0.00 0.00 1.50 0.10 0.00 0.00 2.00 0.13 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.20 0.00 0.00 3.50 0.24 0.00 0.00 4.00 0.28 0.00 0.00 4.50 0.32 0.00 0.00 5.00 0.37 0.00 0.00 5.50 0.42 0.00 0.00 6.00 0.47 0.00 0.00 6.50 0.52 0.00 0.00 7.00 0.59 0.00 0.00 7.50 0.66 0.00 0.00 8.00 0.74 0.00 0.00 8.50 0.83 0.00 0.00 9.00 0.95 0.01 0.00 9.50 1.08 0.02 0.01 10.00 1.23 0.05 0.01 10.50 1.41 0.09 0.02 11.00 1.63 0.15 0.04 11.50 1.94 0.27 0.07 12.00 3.25 0.96 0.57 12.50 4.56 1.87 0.24 13.00 4.87 2.10 0.10 13.50 5.09 2.27 0.08 14.00 5.27 2.41 0.07 14.50 5.42 2.53 0.06 15.00 5.55 2.63 0.05 15.50 5.67 2.72 0.04 16.00 5.76 2.80 0.04 16.50 5.84 2.86 0.03 17.00 5.91 2.92 0.03 17.50 5.98 2.97 0.03 18.00 6.03 3.02 0.02 18.50 6.08 3.06 0.02 19.00 6.13 3.10 0.02 19.50 6.18 3.14 0.02 20.00 6.22 3.17 0.02 20.50 6.26 3.21 0.02 21.00 6.30 3.24 0.02 21.50 6.34 3.27 0.02 22.00 6.37 3.30 0.01 22.50 6.41 3.33 0.01 23.00 6.44 3.36 0.01 23.50 6.47 3.38 0.01 24.00 6.50 3.41 0.01 24.50 6.50 3.41 0.00 25.00 6.50 3.41 0.00 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 90HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Undeveloped Areas Runoff = 0.00 cfs @ 14.90 hrs, Volume= 0.002 af, Depth= 0.13" Routed to Reach 4R : Post-Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 25-Year Rainfall=6.50" Area (sf) CN Description 7,881 30 Woods, Good, HSG A 7,881 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 3S: Undeveloped Areas Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.003 0.003 0.003 0.003 0.003 0.002 0.002 0.002 0.002 0.002 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0 Type III 24-hr 25-Year Rainfall=6.50" Runoff Area=7,881 sf Runoff Volume=0.002 af Runoff Depth=0.13" Tc=6.0 min CN=30 0.00 cfs Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 91HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: Undeveloped Areas Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.07 0.00 0.00 1.50 0.10 0.00 0.00 2.00 0.13 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.20 0.00 0.00 3.50 0.24 0.00 0.00 4.00 0.28 0.00 0.00 4.50 0.32 0.00 0.00 5.00 0.37 0.00 0.00 5.50 0.42 0.00 0.00 6.00 0.47 0.00 0.00 6.50 0.52 0.00 0.00 7.00 0.59 0.00 0.00 7.50 0.66 0.00 0.00 8.00 0.74 0.00 0.00 8.50 0.83 0.00 0.00 9.00 0.95 0.00 0.00 9.50 1.08 0.00 0.00 10.00 1.23 0.00 0.00 10.50 1.41 0.00 0.00 11.00 1.63 0.00 0.00 11.50 1.94 0.00 0.00 12.00 3.25 0.00 0.00 12.50 4.56 0.00 0.00 13.00 4.87 0.00 0.00 13.50 5.09 0.01 0.00 14.00 5.27 0.02 0.00 14.50 5.42 0.02 0.00 15.00 5.55 0.03 0.00 15.50 5.67 0.04 0.00 16.00 5.76 0.05 0.00 16.50 5.84 0.06 0.00 17.00 5.91 0.06 0.00 17.50 5.98 0.07 0.00 18.00 6.03 0.08 0.00 18.50 6.08 0.08 0.00 19.00 6.13 0.09 0.00 19.50 6.18 0.09 0.00 20.00 6.22 0.10 0.00 20.50 6.26 0.10 0.00 21.00 6.30 0.11 0.00 21.50 6.34 0.11 0.00 22.00 6.37 0.12 0.00 22.50 6.41 0.12 0.00 23.00 6.44 0.13 0.00 23.50 6.47 0.13 0.00 24.00 6.50 0.13 0.00 24.50 6.50 0.13 0.00 25.00 6.50 0.13 0.00 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 92HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 1Dis: Pre- Dev Peak Discharge [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.577 ac, 17.55% Impervious, Inflow Depth = 0.87" for 25-Year event Inflow = 0.35 cfs @ 12.12 hrs, Volume= 0.042 af Outflow = 0.35 cfs @ 12.12 hrs, Volume= 0.042 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 1Dis: Pre- Dev Peak Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.577 ac 0.35 cfs 0.35 cfs Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 93HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 1Dis: Pre- Dev Peak Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.05 0.05 12.50 0.17 0.17 13.00 0.08 0.08 13.50 0.07 0.07 14.00 0.06 0.06 14.50 0.05 0.05 15.00 0.05 0.05 15.50 0.04 0.04 16.00 0.04 0.04 16.50 0.03 0.03 17.00 0.03 0.03 17.50 0.03 0.03 18.00 0.02 0.02 18.50 0.02 0.02 19.00 0.02 0.02 19.50 0.02 0.02 20.00 0.02 0.02 20.50 0.02 0.02 21.00 0.02 0.02 21.50 0.02 0.02 22.00 0.02 0.02 22.50 0.02 0.02 23.00 0.01 0.01 23.50 0.01 0.01 24.00 0.01 0.01 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 94HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 4R: Post-Discharge [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.577 ac, 38.78% Impervious, Inflow Depth = 0.04" for 25-Year event Inflow = 0.00 cfs @ 14.90 hrs, Volume= 0.002 af Outflow = 0.00 cfs @ 14.90 hrs, Volume= 0.002 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 4R: Post-Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.003 0.003 0.003 0.003 0.003 0.002 0.002 0.002 0.002 0.002 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0 Inflow Area=0.577 ac 0.00 cfs 0.00 cfs Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 95HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: Post-Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.00 0.00 13.00 0.00 0.00 13.50 0.00 0.00 14.00 0.00 0.00 14.50 0.00 0.00 15.00 0.00 0.00 15.50 0.00 0.00 16.00 0.00 0.00 16.50 0.00 0.00 17.00 0.00 0.00 17.50 0.00 0.00 18.00 0.00 0.00 18.50 0.00 0.00 19.00 0.00 0.00 19.50 0.00 0.00 20.00 0.00 0.00 20.50 0.00 0.00 21.00 0.00 0.00 21.50 0.00 0.00 22.00 0.00 0.00 22.50 0.00 0.00 23.00 0.00 0.00 23.50 0.00 0.00 24.00 0.00 0.00 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 96HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Inflow Area = 0.147 ac, 53.13% Impervious, Inflow Depth = 0.36" for 25-Year event Inflow = 0.14 cfs @ 12.43 hrs, Volume= 0.004 af Outflow = 0.04 cfs @ 12.81 hrs, Volume= 0.004 af, Atten= 74%, Lag= 22.7 min Discarded = 0.04 cfs @ 12.81 hrs, Volume= 0.004 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach 4R : Post-Discharge Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 99.84' @ 12.81 hrs Surf.Area= 154 sf Storage= 69 cf Plug-Flow detention time= 21.0 min calculated for 0.004 af (100% of inflow) Center-of-Mass det. time= 21.0 min ( 788.2 - 767.2 ) Volume Invert Avail.Storage Storage Description #1 99.00' 170 cf 6.00'D x 6.00'H Vertical Cone/Cylinder Inside #2 199 cf Overall - 3.0" Wall Thickness = 170 cf #2 99.00' 326 cf 14.00'D x 6.00'H Vertical Cone/Cylinder 924 cf Overall - 199 cf Embedded = 725 cf x 45.0% Voids 496 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 99.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 104.80'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.04 cfs @ 12.81 hrs HW=99.84' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=99.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 97HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.147 ac Peak Elev=99.84' Storage=69 cf 0.14 cfs 0.04 cfs 0.04 cfs 0.00 cfs Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Exfiltration Broad-Crested Rectangular Weir Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 98HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Wetted Storage Stage-Area-Storage Storage (cubic-feet) 450400350300250200150100500 Surface/Horizontal/Wetted Area (sq-ft) 400350300250200150100500 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Vertical Cone/Cylinder + Vertical Cone/Cylinder Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 99HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 99.00 0.00 0.00 0.00 0.50 0.00 0 99.00 0.00 0.00 0.00 1.00 0.00 0 99.00 0.00 0.00 0.00 1.50 0.00 0 99.00 0.00 0.00 0.00 2.00 0.00 0 99.00 0.00 0.00 0.00 2.50 0.00 0 99.00 0.00 0.00 0.00 3.00 0.00 0 99.00 0.00 0.00 0.00 3.50 0.00 0 99.00 0.00 0.00 0.00 4.00 0.00 0 99.00 0.00 0.00 0.00 4.50 0.00 0 99.00 0.00 0.00 0.00 5.00 0.00 0 99.00 0.00 0.00 0.00 5.50 0.00 0 99.00 0.00 0.00 0.00 6.00 0.00 0 99.00 0.00 0.00 0.00 6.50 0.00 0 99.00 0.00 0.00 0.00 7.00 0.00 0 99.00 0.00 0.00 0.00 7.50 0.00 0 99.00 0.00 0.00 0.00 8.00 0.00 0 99.00 0.00 0.00 0.00 8.50 0.00 0 99.00 0.00 0.00 0.00 9.00 0.00 0 99.00 0.00 0.00 0.00 9.50 0.00 0 99.00 0.00 0.00 0.00 10.00 0.00 0 99.00 0.00 0.00 0.00 10.50 0.00 0 99.00 0.00 0.00 0.00 11.00 0.00 0 99.00 0.00 0.00 0.00 11.50 0.00 0 99.00 0.00 0.00 0.00 12.00 0.00 0 99.00 0.00 0.00 0.00 12.50 0.11 42 99.51 0.03 0.03 0.00 13.00 0.03 65 99.79 0.04 0.04 0.00 13.50 0.01 33 99.39 0.03 0.03 0.00 14.00 0.00 0 99.00 0.00 0.00 0.00 14.50 0.00 0 99.00 0.00 0.00 0.00 15.00 0.00 0 99.00 0.00 0.00 0.00 15.50 0.00 0 99.00 0.00 0.00 0.00 16.00 0.00 0 99.00 0.00 0.00 0.00 16.50 0.00 0 99.00 0.00 0.00 0.00 17.00 0.00 0 99.00 0.00 0.00 0.00 17.50 0.00 0 99.00 0.00 0.00 0.00 18.00 0.00 0 99.00 0.00 0.00 0.00 18.50 0.00 0 99.00 0.00 0.00 0.00 19.00 0.00 0 99.00 0.00 0.00 0.00 19.50 0.00 0 99.00 0.00 0.00 0.00 20.00 0.00 0 99.00 0.00 0.00 0.00 20.50 0.00 0 99.00 0.00 0.00 0.00 21.00 0.00 0 99.00 0.00 0.00 0.00 21.50 0.00 0 99.00 0.00 0.00 0.00 22.00 0.00 0 99.00 0.00 0.00 0.00 22.50 0.00 0 99.00 0.00 0.00 0.00 23.00 0.00 0 99.00 0.00 0.00 0.00 23.50 0.00 0 99.00 0.00 0.00 0.00 24.00 0.00 0 99.00 0.00 0.00 0.00 24.50 0.00 0 99.00 0.00 0.00 0.00 25.00 0.00 0 99.00 0.00 0.00 0.00 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 100HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 99.00 0.00 0.00 0.00 99.10 0.03 0.03 0.00 99.20 0.03 0.03 0.00 99.30 0.03 0.03 0.00 99.40 0.03 0.03 0.00 99.50 0.03 0.03 0.00 99.60 0.03 0.03 0.00 99.70 0.04 0.04 0.00 99.80 0.04 0.04 0.00 99.90 0.04 0.04 0.00 100.00 0.04 0.04 0.00 100.10 0.04 0.04 0.00 100.20 0.04 0.04 0.00 100.30 0.04 0.04 0.00 100.40 0.04 0.04 0.00 100.50 0.04 0.04 0.00 100.60 0.04 0.04 0.00 100.70 0.04 0.04 0.00 100.80 0.04 0.04 0.00 100.90 0.05 0.05 0.00 101.00 0.05 0.05 0.00 101.10 0.05 0.05 0.00 101.20 0.05 0.05 0.00 101.30 0.05 0.05 0.00 101.40 0.05 0.05 0.00 101.50 0.05 0.05 0.00 101.60 0.05 0.05 0.00 101.70 0.05 0.05 0.00 101.80 0.05 0.05 0.00 101.90 0.05 0.05 0.00 102.00 0.05 0.05 0.00 102.10 0.06 0.06 0.00 102.20 0.06 0.06 0.00 102.30 0.06 0.06 0.00 102.40 0.06 0.06 0.00 102.50 0.06 0.06 0.00 102.60 0.06 0.06 0.00 102.70 0.06 0.06 0.00 102.80 0.06 0.06 0.00 102.90 0.06 0.06 0.00 103.00 0.06 0.06 0.00 103.10 0.06 0.06 0.00 103.20 0.06 0.06 0.00 103.30 0.07 0.07 0.00 103.40 0.07 0.07 0.00 103.50 0.07 0.07 0.00 103.60 0.07 0.07 0.00 103.70 0.07 0.07 0.00 103.80 0.07 0.07 0.00 103.90 0.07 0.07 0.00 104.00 0.07 0.07 0.00 104.10 0.07 0.07 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 104.20 0.07 0.07 0.00 104.30 0.07 0.07 0.00 104.40 0.07 0.07 0.00 104.50 0.08 0.08 0.00 104.60 0.08 0.08 0.00 104.70 0.08 0.08 0.00 104.80 0.08 0.08 0.00 104.90 1.07 0.08 0.99 105.00 2.87 0.08 2.79 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 101HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 99.00 154 0 99.10 158 8 99.20 163 17 99.30 167 25 99.40 172 33 99.50 176 41 99.60 180 50 99.70 185 58 99.80 189 66 99.90 194 74 100.00 198 83 100.10 202 91 100.20 207 99 100.30 211 107 100.40 216 116 100.50 220 124 100.60 224 132 100.70 229 140 100.80 233 149 100.90 238 157 101.00 242 165 101.10 246 173 101.20 251 182 101.30 255 190 101.40 259 198 101.50 264 207 101.60 268 215 101.70 273 223 101.80 277 231 101.90 281 240 102.00 286 248 102.10 290 256 102.20 295 264 102.30 299 273 102.40 303 281 102.50 308 289 102.60 312 297 102.70 317 306 102.80 321 314 102.90 325 322 103.00 330 330 103.10 334 339 103.20 339 347 103.30 343 355 103.40 347 364 103.50 352 372 103.60 356 380 103.70 361 388 103.80 365 397 103.90 369 405 104.00 374 413 104.10 378 421 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 104.20 383 430 104.30 387 438 104.40 391 446 104.50 396 454 104.60 400 463 104.70 405 471 104.80 409 479 104.90 413 487 105.00 418 496 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 102HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1SW: Grassed Swale Inflow Area = 0.147 ac, 53.13% Impervious, Inflow Depth = 3.21" for 25-Year event Inflow = 0.55 cfs @ 12.09 hrs, Volume= 0.039 af Outflow = 0.17 cfs @ 12.43 hrs, Volume= 0.037 af, Atten= 68%, Lag= 20.6 min Discarded = 0.04 cfs @ 12.43 hrs, Volume= 0.033 af Primary = 0.14 cfs @ 12.43 hrs, Volume= 0.004 af Routed to Pond CB1 : One (1) Solid Catch Basin with Hood Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 107.53' @ 12.43 hrs Surf.Area= 613 sf Storage= 656 cf Plug-Flow detention time= 197.6 min calculated for 0.037 af (95% of inflow) Center-of-Mass det. time= 171.9 min ( 1,006.2 - 834.3 ) Volume Invert Avail.Storage Storage Description #1 106.00' 974 cf Custom Stage Data (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 106.00 267 61.0 0 0 267 107.00 478 79.0 367 367 479 107.50 605 89.0 270 638 620 108.00 745 98.0 337 974 761 Device Routing Invert Outlet Devices #1 Discarded 106.00'2.410 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 107.50'24.0" x 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.04 cfs @ 12.43 hrs HW=107.53' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.14 cfs @ 12.43 hrs HW=107.53' TW=105.70' (Dynamic Tailwater) 2=Orifice/Grate (Weir Controls 0.14 cfs @ 0.57 fps) Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 103HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.147 ac Peak Elev=107.53' Storage=656 cf 0.55 cfs 0.17 cfs 0.04 cfs 0.14 cfs Pond 1SW: Grassed Swale Total Discarded Primary Stage-Discharge Discharge (cfs) 9876543210 El e v a t i o n ( f e e t ) 108 107 106 Exfiltration Orifice/Grate Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 104HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale Surface Wetted Storage Stage-Area-Storage Storage (cubic-feet) 9008007006005004003002001000 Surface/Horizontal/Wetted Area (sq-ft) 7006005004003002001000 El e v a t i o n ( f e e t ) 108 107 106 Custom Stage Data Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 105HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1SW: Grassed Swale Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 106.00 0.00 0.00 0.00 0.50 0.00 0 106.00 0.00 0.00 0.00 1.00 0.00 0 106.00 0.00 0.00 0.00 1.50 0.00 0 106.00 0.00 0.00 0.00 2.00 0.00 0 106.00 0.00 0.00 0.00 2.50 0.00 0 106.00 0.00 0.00 0.00 3.00 0.00 0 106.00 0.00 0.00 0.00 3.50 0.00 0 106.00 0.00 0.00 0.00 4.00 0.00 0 106.00 0.00 0.00 0.00 4.50 0.00 0 106.00 0.00 0.00 0.00 5.00 0.00 0 106.00 0.00 0.00 0.00 5.50 0.00 0 106.00 0.00 0.00 0.00 6.00 0.00 0 106.00 0.00 0.00 0.00 6.50 0.00 0 106.00 0.00 0.00 0.00 7.00 0.00 0 106.00 0.00 0.00 0.00 7.50 0.00 0 106.00 0.00 0.00 0.00 8.00 0.00 0 106.00 0.00 0.00 0.00 8.50 0.00 0 106.00 0.00 0.00 0.00 9.00 0.00 0 106.00 0.00 0.00 0.00 9.50 0.00 1 106.00 0.00 0.00 0.00 10.00 0.01 1 106.00 0.01 0.01 0.00 10.50 0.01 2 106.01 0.01 0.01 0.00 11.00 0.02 4 106.01 0.02 0.02 0.00 11.50 0.04 23 106.09 0.02 0.02 0.00 12.00 0.31 200 106.61 0.02 0.02 0.00 12.50 0.14 654 107.53 0.15 0.03 0.11 13.00 0.06 643 107.51 0.06 0.03 0.03 13.50 0.05 641 107.51 0.05 0.03 0.01 14.00 0.04 639 107.50 0.04 0.03 0.00 14.50 0.03 637 107.50 0.03 0.03 0.00 15.00 0.03 630 107.49 0.03 0.03 0.00 15.50 0.02 617 107.46 0.03 0.03 0.00 16.00 0.02 596 107.43 0.03 0.03 0.00 16.50 0.02 571 107.39 0.03 0.03 0.00 17.00 0.02 544 107.34 0.03 0.03 0.00 17.50 0.01 515 107.29 0.03 0.03 0.00 18.00 0.01 484 107.23 0.03 0.03 0.00 18.50 0.01 452 107.17 0.03 0.03 0.00 19.00 0.01 421 107.11 0.03 0.03 0.00 19.50 0.01 390 107.05 0.03 0.03 0.00 20.00 0.01 361 106.99 0.03 0.03 0.00 20.50 0.01 331 106.92 0.03 0.03 0.00 21.00 0.01 303 106.86 0.02 0.02 0.00 21.50 0.01 275 106.80 0.02 0.02 0.00 22.00 0.01 248 106.73 0.02 0.02 0.00 22.50 0.01 222 106.67 0.02 0.02 0.00 23.00 0.01 196 106.60 0.02 0.02 0.00 23.50 0.01 171 106.54 0.02 0.02 0.00 24.00 0.01 147 106.47 0.02 0.02 0.00 24.50 0.00 114 106.38 0.02 0.02 0.00 25.00 0.00 81 106.28 0.02 0.02 0.00 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 106HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1SW: Grassed Swale Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 106.00 0.00 0.00 0.00 106.02 0.02 0.02 0.00 106.04 0.02 0.02 0.00 106.06 0.02 0.02 0.00 106.08 0.02 0.02 0.00 106.10 0.02 0.02 0.00 106.12 0.02 0.02 0.00 106.14 0.02 0.02 0.00 106.16 0.02 0.02 0.00 106.18 0.02 0.02 0.00 106.20 0.02 0.02 0.00 106.22 0.02 0.02 0.00 106.24 0.02 0.02 0.00 106.26 0.02 0.02 0.00 106.28 0.02 0.02 0.00 106.30 0.02 0.02 0.00 106.32 0.02 0.02 0.00 106.34 0.02 0.02 0.00 106.36 0.02 0.02 0.00 106.38 0.02 0.02 0.00 106.40 0.02 0.02 0.00 106.42 0.02 0.02 0.00 106.44 0.02 0.02 0.00 106.46 0.02 0.02 0.00 106.48 0.02 0.02 0.00 106.50 0.02 0.02 0.00 106.52 0.02 0.02 0.00 106.54 0.02 0.02 0.00 106.56 0.02 0.02 0.00 106.58 0.02 0.02 0.00 106.60 0.02 0.02 0.00 106.62 0.02 0.02 0.00 106.64 0.02 0.02 0.00 106.66 0.02 0.02 0.00 106.68 0.02 0.02 0.00 106.70 0.02 0.02 0.00 106.72 0.02 0.02 0.00 106.74 0.02 0.02 0.00 106.76 0.02 0.02 0.00 106.78 0.02 0.02 0.00 106.80 0.02 0.02 0.00 106.82 0.02 0.02 0.00 106.84 0.02 0.02 0.00 106.86 0.02 0.02 0.00 106.88 0.03 0.03 0.00 106.90 0.03 0.03 0.00 106.92 0.03 0.03 0.00 106.94 0.03 0.03 0.00 106.96 0.03 0.03 0.00 106.98 0.03 0.03 0.00 107.00 0.03 0.03 0.00 107.02 0.03 0.03 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 107.04 0.03 0.03 0.00 107.06 0.03 0.03 0.00 107.08 0.03 0.03 0.00 107.10 0.03 0.03 0.00 107.12 0.03 0.03 0.00 107.14 0.03 0.03 0.00 107.16 0.03 0.03 0.00 107.18 0.03 0.03 0.00 107.20 0.03 0.03 0.00 107.22 0.03 0.03 0.00 107.24 0.03 0.03 0.00 107.26 0.03 0.03 0.00 107.28 0.03 0.03 0.00 107.30 0.03 0.03 0.00 107.32 0.03 0.03 0.00 107.34 0.03 0.03 0.00 107.36 0.03 0.03 0.00 107.38 0.03 0.03 0.00 107.40 0.03 0.03 0.00 107.42 0.03 0.03 0.00 107.44 0.03 0.03 0.00 107.46 0.03 0.03 0.00 107.48 0.03 0.03 0.00 107.50 0.03 0.03 0.00 107.52 0.11 0.03 0.07 107.54 0.24 0.04 0.21 107.56 0.42 0.04 0.38 107.58 0.63 0.04 0.59 107.60 0.86 0.04 0.83 107.62 1.12 0.04 1.09 107.64 1.41 0.04 1.37 107.66 1.71 0.04 1.67 107.68 2.04 0.04 2.00 107.70 2.38 0.04 2.34 107.72 2.74 0.04 2.70 107.74 3.11 0.04 3.08 107.76 3.51 0.04 3.47 107.78 3.91 0.04 3.88 107.80 4.34 0.04 4.30 107.82 4.78 0.04 4.74 107.84 5.23 0.04 5.19 107.86 5.69 0.04 5.65 107.88 6.17 0.04 6.13 107.90 6.66 0.04 6.62 107.92 7.16 0.04 7.12 107.94 7.68 0.04 7.64 107.96 8.20 0.04 8.16 107.98 8.74 0.04 8.70 108.00 9.29 0.04 9.25 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 107HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1SW: Grassed Swale Elevation (feet) Surface (sq-ft) Wetted (sq-ft) Storage (cubic-feet) 106.00 267 267 0 106.05 276 276 14 106.10 285 286 28 106.15 295 295 42 106.20 304 305 57 106.25 314 315 73 106.30 324 325 88 106.35 334 335 105 106.40 344 345 122 106.45 354 356 139 106.50 365 366 157 106.55 376 377 176 106.60 386 388 195 106.65 397 399 214 106.70 408 410 235 106.75 420 421 255 106.80 431 433 277 106.85 442 444 298 106.90 454 456 321 106.95 466 467 344 107.00 478 479 367 107.05 490 493 392 107.10 502 506 416 107.15 515 520 442 107.20 527 533 468 107.25 540 547 495 107.30 552 561 522 107.35 565 576 550 107.40 578 590 578 107.45 592 605 608 107.50 605 620 638 107.55 618 633 668 107.60 632 647 699 107.65 645 661 731 107.70 659 675 764 107.75 673 689 797 107.80 687 703 831 107.85 701 717 866 107.90 716 732 901 107.95 730 747 938 108.00 745 761 974 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 108HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Inflow Area = 0.249 ac, 58.50% Impervious, Inflow Depth = 3.41" for 25-Year event Inflow = 0.99 cfs @ 12.09 hrs, Volume= 0.071 af Outflow = 0.16 cfs @ 12.59 hrs, Volume= 0.071 af, Atten= 84%, Lag= 30.0 min Discarded = 0.16 cfs @ 12.59 hrs, Volume= 0.071 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach 4R : Post-Discharge Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 103.31' @ 12.59 hrs Surf.Area= 432 sf Storage= 1,009 cf Plug-Flow detention time= 53.8 min calculated for 0.071 af (100% of inflow) Center-of-Mass det. time= 53.8 min ( 883.6 - 829.8 ) Volume Invert Avail.Storage Storage Description #1 99.00' 898 cf 12.00'W x 36.00'L x 6.00'H Prismatoid 2,592 cf Overall - 597 cf Embedded = 1,995 cf x 45.0% Voids #2 99.00' 509 cf 6.00'D x 6.00'H Vertical Cone/Cylinder x 3 Inside #1 597 cf Overall - 3.0" Wall Thickness = 509 cf 1,407 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 99.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 104.80'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.16 cfs @ 12.59 hrs HW=103.31' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.16 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=99.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 109HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.249 ac Peak Elev=103.31' Storage=1,009 cf 0.99 cfs 0.16 cfs 0.16 cfs 0.00 cfs Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Exfiltration Broad-Crested Rectangular Weir Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 110HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Wetted Storage Stage-Area-Storage Storage (cubic-feet) 1,4001,2001,0008006004002000 Surface/Horizontal/Wetted Area (sq-ft) 1,0009008007006005004003002001000 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Prismatoid + Vertical Cone/Cylinder Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 111HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 99.00 0.00 0.00 0.00 0.50 0.00 0 99.00 0.00 0.00 0.00 1.00 0.00 0 99.00 0.00 0.00 0.00 1.50 0.00 0 99.00 0.00 0.00 0.00 2.00 0.00 0 99.00 0.00 0.00 0.00 2.50 0.00 0 99.00 0.00 0.00 0.00 3.00 0.00 0 99.00 0.00 0.00 0.00 3.50 0.00 0 99.00 0.00 0.00 0.00 4.00 0.00 0 99.00 0.00 0.00 0.00 4.50 0.00 0 99.00 0.00 0.00 0.00 5.00 0.00 0 99.00 0.00 0.00 0.00 5.50 0.00 0 99.00 0.00 0.00 0.00 6.00 0.00 0 99.00 0.00 0.00 0.00 6.50 0.00 0 99.00 0.00 0.00 0.00 7.00 0.00 0 99.00 0.00 0.00 0.00 7.50 0.00 0 99.00 0.00 0.00 0.00 8.00 0.00 0 99.00 0.00 0.00 0.00 8.50 0.00 0 99.00 0.00 0.00 0.00 9.00 0.00 0 99.00 0.00 0.00 0.00 9.50 0.01 0 99.00 0.01 0.01 0.00 10.00 0.01 0 99.00 0.01 0.01 0.00 10.50 0.02 1 99.00 0.02 0.02 0.00 11.00 0.04 1 99.00 0.04 0.04 0.00 11.50 0.07 2 99.01 0.07 0.07 0.00 12.00 0.57 234 100.00 0.10 0.10 0.00 12.50 0.24 998 103.26 0.16 0.16 0.00 13.00 0.10 957 103.08 0.16 0.16 0.00 13.50 0.08 839 102.58 0.15 0.15 0.00 14.00 0.07 711 102.03 0.14 0.14 0.00 14.50 0.06 581 101.48 0.13 0.13 0.00 15.00 0.05 455 100.94 0.12 0.12 0.00 15.50 0.04 335 100.43 0.11 0.11 0.00 16.00 0.04 218 99.93 0.10 0.10 0.00 16.50 0.03 106 99.45 0.09 0.09 0.00 17.00 0.03 4 99.02 0.08 0.08 0.00 17.50 0.03 1 99.00 0.03 0.03 0.00 18.00 0.02 1 99.00 0.02 0.02 0.00 18.50 0.02 1 99.00 0.02 0.02 0.00 19.00 0.02 1 99.00 0.02 0.02 0.00 19.50 0.02 1 99.00 0.02 0.02 0.00 20.00 0.02 1 99.00 0.02 0.02 0.00 20.50 0.02 0 99.00 0.02 0.02 0.00 21.00 0.02 0 99.00 0.02 0.02 0.00 21.50 0.02 0 99.00 0.02 0.02 0.00 22.00 0.01 0 99.00 0.01 0.01 0.00 22.50 0.01 0 99.00 0.01 0.01 0.00 23.00 0.01 0 99.00 0.01 0.01 0.00 23.50 0.01 0 99.00 0.01 0.01 0.00 24.00 0.01 0 99.00 0.01 0.01 0.00 24.50 0.00 0 99.00 0.00 0.00 0.00 25.00 0.00 0 99.00 0.00 0.00 0.00 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 112HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 99.00 0.00 0.00 0.00 99.10 0.08 0.08 0.00 99.20 0.09 0.09 0.00 99.30 0.09 0.09 0.00 99.40 0.09 0.09 0.00 99.50 0.09 0.09 0.00 99.60 0.09 0.09 0.00 99.70 0.10 0.10 0.00 99.80 0.10 0.10 0.00 99.90 0.10 0.10 0.00 100.00 0.10 0.10 0.00 100.10 0.10 0.10 0.00 100.20 0.10 0.10 0.00 100.30 0.11 0.11 0.00 100.40 0.11 0.11 0.00 100.50 0.11 0.11 0.00 100.60 0.11 0.11 0.00 100.70 0.11 0.11 0.00 100.80 0.12 0.12 0.00 100.90 0.12 0.12 0.00 101.00 0.12 0.12 0.00 101.10 0.12 0.12 0.00 101.20 0.12 0.12 0.00 101.30 0.12 0.12 0.00 101.40 0.13 0.13 0.00 101.50 0.13 0.13 0.00 101.60 0.13 0.13 0.00 101.70 0.13 0.13 0.00 101.80 0.13 0.13 0.00 101.90 0.14 0.14 0.00 102.00 0.14 0.14 0.00 102.10 0.14 0.14 0.00 102.20 0.14 0.14 0.00 102.30 0.14 0.14 0.00 102.40 0.15 0.15 0.00 102.50 0.15 0.15 0.00 102.60 0.15 0.15 0.00 102.70 0.15 0.15 0.00 102.80 0.15 0.15 0.00 102.90 0.15 0.15 0.00 103.00 0.16 0.16 0.00 103.10 0.16 0.16 0.00 103.20 0.16 0.16 0.00 103.30 0.16 0.16 0.00 103.40 0.16 0.16 0.00 103.50 0.17 0.17 0.00 103.60 0.17 0.17 0.00 103.70 0.17 0.17 0.00 103.80 0.17 0.17 0.00 103.90 0.17 0.17 0.00 104.00 0.17 0.17 0.00 104.10 0.18 0.18 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 104.20 0.18 0.18 0.00 104.30 0.18 0.18 0.00 104.40 0.18 0.18 0.00 104.50 0.18 0.18 0.00 104.60 0.19 0.19 0.00 104.70 0.19 0.19 0.00 104.80 0.19 0.19 0.00 104.90 1.18 0.19 0.99 105.00 2.98 0.19 2.79 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 113HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 99.00 432 0 99.10 442 23 99.20 451 47 99.30 461 70 99.40 470 94 99.50 480 117 99.60 490 141 99.70 499 164 99.80 509 188 99.90 518 211 100.00 528 234 100.10 538 258 100.20 547 281 100.30 557 305 100.40 566 328 100.50 576 352 100.60 586 375 100.70 595 399 100.80 605 422 100.90 614 445 101.00 624 469 101.10 634 492 101.20 643 516 101.30 653 539 101.40 662 563 101.50 672 586 101.60 682 610 101.70 691 633 101.80 701 656 101.90 710 680 102.00 720 703 102.10 730 727 102.20 739 750 102.30 749 774 102.40 758 797 102.50 768 820 102.60 778 844 102.70 787 867 102.80 797 891 102.90 806 914 103.00 816 938 103.10 826 961 103.20 835 985 103.30 845 1,008 103.40 854 1,031 103.50 864 1,055 103.60 874 1,078 103.70 883 1,102 103.80 893 1,125 103.90 902 1,149 104.00 912 1,172 104.10 922 1,196 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 104.20 931 1,219 104.30 941 1,242 104.40 950 1,266 104.50 960 1,289 104.60 970 1,313 104.70 979 1,336 104.80 989 1,360 104.90 998 1,383 105.00 1,008 1,407 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 114HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB1: One (1) Solid Catch Basin with Hood Inflow Area = 0.147 ac, 53.13% Impervious, Inflow Depth = 0.36" for 25-Year event Inflow = 0.14 cfs @ 12.43 hrs, Volume= 0.004 af Outflow = 0.14 cfs @ 12.43 hrs, Volume= 0.004 af, Atten= 0%, Lag= 0.0 min Primary = 0.14 cfs @ 12.43 hrs, Volume= 0.004 af Routed to Pond 1P : (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 105.70' @ 12.43 hrs Flood Elev= 107.50' Device Routing Invert Outlet Devices #1 Primary 105.50'12.0" Round Culvert L= 20.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 105.50' / 105.00' S= 0.0250 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.79 sf Primary OutFlow Max=0.14 cfs @ 12.43 hrs HW=105.70' TW=99.23' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.14 cfs @ 1.21 fps) Pond CB1: One (1) Solid Catch Basin with Hood Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.147 ac Peak Elev=105.70' 12.0" Round Culvert n=0.020 L=20.0' S=0.0250 '/' 0.14 cfs 0.14 cfs Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 115HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB1: One (1) Solid Catch Basin with Hood Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 107 106 Culvert Pond CB1: One (1) Solid Catch Basin with Hood Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 107 106 Flood Elevation Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 116HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB1: One (1) Solid Catch Basin with Hood Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 105.50 0.00 0.50 0.00 105.50 0.00 1.00 0.00 105.50 0.00 1.50 0.00 105.50 0.00 2.00 0.00 105.50 0.00 2.50 0.00 105.50 0.00 3.00 0.00 105.50 0.00 3.50 0.00 105.50 0.00 4.00 0.00 105.50 0.00 4.50 0.00 105.50 0.00 5.00 0.00 105.50 0.00 5.50 0.00 105.50 0.00 6.00 0.00 105.50 0.00 6.50 0.00 105.50 0.00 7.00 0.00 105.50 0.00 7.50 0.00 105.50 0.00 8.00 0.00 105.50 0.00 8.50 0.00 105.50 0.00 9.00 0.00 105.50 0.00 9.50 0.00 105.50 0.00 10.00 0.00 105.50 0.00 10.50 0.00 105.50 0.00 11.00 0.00 105.50 0.00 11.50 0.00 105.50 0.00 12.00 0.00 105.50 0.00 12.50 0.11 105.68 0.11 13.00 0.03 105.59 0.03 13.50 0.01 105.56 0.01 14.00 0.00 105.53 0.00 14.50 0.00 105.50 0.00 15.00 0.00 105.50 0.00 15.50 0.00 105.50 0.00 16.00 0.00 105.50 0.00 16.50 0.00 105.50 0.00 17.00 0.00 105.50 0.00 17.50 0.00 105.50 0.00 18.00 0.00 105.50 0.00 18.50 0.00 105.50 0.00 19.00 0.00 105.50 0.00 19.50 0.00 105.50 0.00 20.00 0.00 105.50 0.00 20.50 0.00 105.50 0.00 21.00 0.00 105.50 0.00 21.50 0.00 105.50 0.00 22.00 0.00 105.50 0.00 22.50 0.00 105.50 0.00 23.00 0.00 105.50 0.00 23.50 0.00 105.50 0.00 24.00 0.00 105.50 0.00 24.50 0.00 105.50 0.00 25.00 0.00 105.50 0.00 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 117HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB1: One (1) Solid Catch Basin with Hood Elevation (feet) Primary (cfs) 105.50 0.00 105.51 0.00 105.52 0.00 105.53 0.00 105.54 0.01 105.55 0.01 105.56 0.01 105.57 0.02 105.58 0.02 105.59 0.03 105.60 0.03 105.61 0.04 105.62 0.05 105.63 0.06 105.64 0.07 105.65 0.08 105.66 0.09 105.67 0.10 105.68 0.11 105.69 0.12 105.70 0.13 105.71 0.15 105.72 0.16 105.73 0.18 105.74 0.19 105.75 0.21 105.76 0.22 105.77 0.24 105.78 0.26 105.79 0.27 105.80 0.29 105.81 0.31 105.82 0.33 105.83 0.35 105.84 0.37 105.85 0.39 105.86 0.41 105.87 0.43 105.88 0.45 105.89 0.48 105.90 0.50 105.91 0.52 105.92 0.55 105.93 0.57 105.94 0.59 105.95 0.62 105.96 0.64 105.97 0.67 105.98 0.69 105.99 0.72 106.00 0.75 106.01 0.77 Elevation (feet) Primary (cfs) 106.02 0.80 106.03 0.83 106.04 0.85 106.05 0.88 106.06 0.91 106.07 0.94 106.08 0.97 106.09 1.00 106.10 1.02 106.11 1.05 106.12 1.08 106.13 1.11 106.14 1.14 106.15 1.17 106.16 1.20 106.17 1.23 106.18 1.26 106.19 1.29 106.20 1.32 106.21 1.35 106.22 1.38 106.23 1.41 106.24 1.44 106.25 1.47 106.26 1.50 106.27 1.53 106.28 1.56 106.29 1.59 106.30 1.62 106.31 1.65 106.32 1.68 106.33 1.71 106.34 1.74 106.35 1.76 106.36 1.79 106.37 1.82 106.38 1.85 106.39 1.87 106.40 1.90 106.41 1.92 106.42 1.95 106.43 1.97 106.44 2.00 106.45 2.02 106.46 2.04 106.47 2.06 106.48 2.08 106.49 2.10 106.50 2.11 106.51 2.13 106.52 2.15 106.53 2.17 Elevation (feet) Primary (cfs) 106.54 2.19 106.55 2.21 106.56 2.23 106.57 2.25 106.58 2.27 106.59 2.29 106.60 2.31 106.61 2.33 106.62 2.35 106.63 2.37 106.64 2.39 106.65 2.41 106.66 2.43 106.67 2.44 106.68 2.46 106.69 2.48 106.70 2.50 106.71 2.52 106.72 2.53 106.73 2.55 106.74 2.57 106.75 2.59 106.76 2.60 106.77 2.62 106.78 2.64 106.79 2.65 106.80 2.67 106.81 2.69 106.82 2.70 106.83 2.72 106.84 2.74 106.85 2.75 106.86 2.77 106.87 2.78 106.88 2.80 106.89 2.82 106.90 2.83 106.91 2.85 106.92 2.86 106.93 2.88 106.94 2.89 106.95 2.91 106.96 2.93 106.97 2.94 106.98 2.96 106.99 2.97 107.00 2.99 107.01 3.00 107.02 3.02 107.03 3.03 107.04 3.04 107.05 3.06 Elevation (feet) Primary (cfs) 107.06 3.07 107.07 3.09 107.08 3.10 107.09 3.12 107.10 3.13 107.11 3.15 107.12 3.16 107.13 3.17 107.14 3.19 107.15 3.20 107.16 3.22 107.17 3.23 107.18 3.24 107.19 3.26 107.20 3.27 107.21 3.28 107.22 3.30 107.23 3.31 107.24 3.32 107.25 3.34 107.26 3.35 107.27 3.36 107.28 3.38 107.29 3.39 107.30 3.40 107.31 3.42 107.32 3.43 107.33 3.44 107.34 3.46 107.35 3.47 107.36 3.48 107.37 3.49 107.38 3.51 107.39 3.52 107.40 3.53 107.41 3.55 107.42 3.56 107.43 3.57 107.44 3.58 107.45 3.60 107.46 3.61 107.47 3.62 107.48 3.63 107.49 3.64 107.50 3.66 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 118HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB1: One (1) Solid Catch Basin with Hood Elevation (feet) Storage (acre-feet) 105.50 0.000 105.52 0.000 105.54 0.000 105.56 0.000 105.58 0.000 105.60 0.000 105.62 0.000 105.64 0.000 105.66 0.000 105.68 0.000 105.70 0.000 105.72 0.000 105.74 0.000 105.76 0.000 105.78 0.000 105.80 0.000 105.82 0.000 105.84 0.000 105.86 0.000 105.88 0.000 105.90 0.000 105.92 0.000 105.94 0.000 105.96 0.000 105.98 0.000 106.00 0.000 106.02 0.000 106.04 0.000 106.06 0.000 106.08 0.000 106.10 0.000 106.12 0.000 106.14 0.000 106.16 0.000 106.18 0.000 106.20 0.000 106.22 0.000 106.24 0.000 106.26 0.000 106.28 0.000 106.30 0.000 106.32 0.000 106.34 0.000 106.36 0.000 106.38 0.000 106.40 0.000 106.42 0.000 106.44 0.000 106.46 0.000 106.48 0.000 106.50 0.000 106.52 0.000 Elevation (feet) Storage (acre-feet) 106.54 0.000 106.56 0.000 106.58 0.000 106.60 0.000 106.62 0.000 106.64 0.000 106.66 0.000 106.68 0.000 106.70 0.000 106.72 0.000 106.74 0.000 106.76 0.000 106.78 0.000 106.80 0.000 106.82 0.000 106.84 0.000 106.86 0.000 106.88 0.000 106.90 0.000 106.92 0.000 106.94 0.000 106.96 0.000 106.98 0.000 107.00 0.000 107.02 0.000 107.04 0.000 107.06 0.000 107.08 0.000 107.10 0.000 107.12 0.000 107.14 0.000 107.16 0.000 107.18 0.000 107.20 0.000 107.22 0.000 107.24 0.000 107.26 0.000 107.28 0.000 107.30 0.000 107.32 0.000 107.34 0.000 107.36 0.000 107.38 0.000 107.40 0.000 107.42 0.000 107.44 0.000 107.46 0.000 107.48 0.000 107.50 0.000 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 119HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB2: Pool Drain and Roof Leaders Inflow Area = 0.249 ac, 58.50% Impervious, Inflow Depth = 3.41" for 25-Year event Inflow = 0.99 cfs @ 12.09 hrs, Volume= 0.071 af Outflow = 0.99 cfs @ 12.09 hrs, Volume= 0.071 af, Atten= 0%, Lag= 0.0 min Primary = 0.99 cfs @ 12.09 hrs, Volume= 0.071 af Routed to Pond 2P : (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 110.86' @ 12.09 hrs Flood Elev= 111.00' Device Routing Invert Outlet Devices #1 Primary 110.50'6.0" Round Culvert X 4.00 L= 50.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 110.50' / 105.00' S= 0.1100 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.20 sf Primary OutFlow Max=0.99 cfs @ 12.09 hrs HW=110.86' TW=100.98' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.99 cfs @ 1.62 fps) Pond CB2: Pool Drain and Roof Leaders Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.249 ac Peak Elev=110.86' 6.0" Round Culvert x 4.00 n=0.020 L=50.0' S=0.1100 '/' 0.99 cfs 0.99 cfs Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 120HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB2: Pool Drain and Roof Leaders Primary Stage-Discharge Discharge (cfs) 10 El e v a t i o n ( f e e t ) 111 110.98 110.96 110.94 110.92 110.9 110.88 110.86 110.84 110.82 110.8 110.78 110.76 110.74 110.72 110.7 110.68 110.66 110.64 110.62 110.6 110.58 110.56 110.54 110.52 110.5 Culvert Pond CB2: Pool Drain and Roof Leaders Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 111 110.98 110.96 110.94 110.92 110.9 110.88 110.86 110.84 110.82 110.8 110.78 110.76 110.74 110.72 110.7 110.68 110.66 110.64 110.62 110.6 110.58 110.56 110.54 110.52 110.5 Flood Elevation Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 121HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB2: Pool Drain and Roof Leaders Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 110.50 0.00 0.50 0.00 110.50 0.00 1.00 0.00 110.50 0.00 1.50 0.00 110.50 0.00 2.00 0.00 110.50 0.00 2.50 0.00 110.50 0.00 3.00 0.00 110.50 0.00 3.50 0.00 110.50 0.00 4.00 0.00 110.50 0.00 4.50 0.00 110.50 0.00 5.00 0.00 110.50 0.00 5.50 0.00 110.50 0.00 6.00 0.00 110.50 0.00 6.50 0.00 110.50 0.00 7.00 0.00 110.50 0.00 7.50 0.00 110.50 0.00 8.00 0.00 110.50 0.00 8.50 0.00 110.51 0.00 9.00 0.00 110.52 0.00 9.50 0.01 110.53 0.01 10.00 0.01 110.54 0.01 10.50 0.02 110.55 0.02 11.00 0.04 110.56 0.04 11.50 0.07 110.59 0.07 12.00 0.57 110.76 0.57 12.50 0.24 110.66 0.24 13.00 0.10 110.60 0.10 13.50 0.08 110.59 0.08 14.00 0.07 110.58 0.07 14.50 0.06 110.58 0.06 15.00 0.05 110.57 0.05 15.50 0.04 110.57 0.04 16.00 0.04 110.56 0.04 16.50 0.03 110.56 0.03 17.00 0.03 110.55 0.03 17.50 0.03 110.55 0.03 18.00 0.02 110.55 0.02 18.50 0.02 110.55 0.02 19.00 0.02 110.54 0.02 19.50 0.02 110.54 0.02 20.00 0.02 110.54 0.02 20.50 0.02 110.54 0.02 21.00 0.02 110.54 0.02 21.50 0.02 110.54 0.02 22.00 0.01 110.54 0.01 22.50 0.01 110.54 0.01 23.00 0.01 110.54 0.01 23.50 0.01 110.54 0.01 24.00 0.01 110.53 0.01 24.50 0.00 110.50 0.00 25.00 0.00 110.50 0.00 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 122HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB2: Pool Drain and Roof Leaders Elevation (feet) Primary (cfs) 110.50 0.00 110.51 0.00 110.52 0.00 110.53 0.01 110.54 0.02 110.55 0.02 110.56 0.04 110.57 0.05 110.58 0.06 110.59 0.08 110.60 0.10 110.61 0.11 110.62 0.13 110.63 0.16 110.64 0.18 110.65 0.21 110.66 0.23 110.67 0.26 110.68 0.29 110.69 0.32 110.70 0.35 110.71 0.39 110.72 0.42 110.73 0.45 110.74 0.49 110.75 0.53 110.76 0.57 110.77 0.60 110.78 0.64 110.79 0.68 110.80 0.72 110.81 0.77 110.82 0.81 110.83 0.85 110.84 0.89 110.85 0.93 110.86 0.98 110.87 1.02 110.88 1.06 110.89 1.10 110.90 1.15 110.91 1.19 110.92 1.23 110.93 1.27 110.94 1.31 110.95 1.34 110.96 1.38 110.97 1.41 110.98 1.44 110.99 1.47 111.00 1.49 Type III 24-hr 25-Year Rainfall=6.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 123HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB2: Pool Drain and Roof Leaders Elevation (feet) Storage (acre-feet) 110.50 0.000 110.51 0.000 110.52 0.000 110.53 0.000 110.54 0.000 110.55 0.000 110.56 0.000 110.57 0.000 110.58 0.000 110.59 0.000 110.60 0.000 110.61 0.000 110.62 0.000 110.63 0.000 110.64 0.000 110.65 0.000 110.66 0.000 110.67 0.000 110.68 0.000 110.69 0.000 110.70 0.000 110.71 0.000 110.72 0.000 110.73 0.000 110.74 0.000 110.75 0.000 110.76 0.000 110.77 0.000 110.78 0.000 110.79 0.000 110.80 0.000 110.81 0.000 110.82 0.000 110.83 0.000 110.84 0.000 110.85 0.000 110.86 0.000 110.87 0.000 110.88 0.000 110.89 0.000 110.90 0.000 110.91 0.000 110.92 0.000 110.93 0.000 110.94 0.000 110.95 0.000 110.96 0.000 110.97 0.000 110.98 0.000 110.99 0.000 111.00 0.000 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 124HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1Ex: Existing Project Area Runoff = 1.00 cfs @ 12.10 hrs, Volume= 0.086 af, Depth= 1.79" Routed to Reach 1Dis : Pre- Dev Peak Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 100-Year Rainfall=8.50" Area (sf) CN Description * 4,410 98 Driveway/House/Pool, HSG A 2,500 39 >75% Grass cover, Good, HSG A 18,214 30 Woods, Good, HSG A 25,124 43 Weighted Average 20,714 82.45% Pervious Area 4,410 17.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1Ex: Existing Project Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Type III 24-hr 100-Year Rainfall=8.50" Runoff Area=25,124 sf Runoff Volume=0.086 af Runoff Depth=1.79" Tc=6.0 min CN=43 1.00 cfs Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 125HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1Ex: Existing Project Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.04 0.00 0.00 1.00 0.08 0.00 0.00 1.50 0.13 0.00 0.00 2.00 0.17 0.00 0.00 2.50 0.21 0.00 0.00 3.00 0.26 0.00 0.00 3.50 0.31 0.00 0.00 4.00 0.37 0.00 0.00 4.50 0.42 0.00 0.00 5.00 0.48 0.00 0.00 5.50 0.55 0.00 0.00 6.00 0.61 0.00 0.00 6.50 0.69 0.00 0.00 7.00 0.77 0.00 0.00 7.50 0.86 0.00 0.00 8.00 0.97 0.00 0.00 8.50 1.09 0.00 0.00 9.00 1.24 0.00 0.00 9.50 1.41 0.00 0.00 10.00 1.61 0.00 0.00 10.50 1.84 0.00 0.00 11.00 2.12 0.00 0.00 11.50 2.53 0.00 0.00 12.00 4.25 0.17 0.41 12.50 5.97 0.66 0.35 13.00 6.37 0.82 0.16 13.50 6.66 0.93 0.13 14.00 6.89 1.03 0.11 14.50 7.09 1.11 0.10 15.00 7.26 1.19 0.09 15.50 7.41 1.26 0.07 16.00 7.53 1.31 0.06 16.50 7.64 1.36 0.06 17.00 7.73 1.41 0.05 17.50 7.81 1.45 0.05 18.00 7.89 1.48 0.04 18.50 7.95 1.52 0.04 19.00 8.02 1.55 0.04 19.50 8.08 1.58 0.03 20.00 8.13 1.60 0.03 20.50 8.19 1.63 0.03 21.00 8.24 1.66 0.03 21.50 8.29 1.68 0.03 22.00 8.34 1.71 0.03 22.50 8.38 1.73 0.03 23.00 8.42 1.75 0.02 23.50 8.46 1.77 0.02 24.00 8.50 1.79 0.02 24.50 8.50 1.79 0.00 25.00 8.50 1.79 0.00 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 126HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Driveway Area with Landscape Runoff = 0.84 cfs @ 12.09 hrs, Volume= 0.060 af, Depth= 4.90" Routed to Pond 1SW : Grassed Swale Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 100-Year Rainfall=8.50" Area (sf) CN Description * 3,400 98 Driveway/House/Pool, HSG A 3,000 39 >75% Grass cover, Good, HSG A 6,400 70 Weighted Average 3,000 46.88% Pervious Area 3,400 53.13% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1S: Driveway Area with Landscape Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 100-Year Rainfall=8.50" Runoff Area=6,400 sf Runoff Volume=0.060 af Runoff Depth=4.90" Tc=6.0 min CN=70 0.84 cfs Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 127HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: Driveway Area with Landscape Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.04 0.00 0.00 1.00 0.08 0.00 0.00 1.50 0.13 0.00 0.00 2.00 0.17 0.00 0.00 2.50 0.21 0.00 0.00 3.00 0.26 0.00 0.00 3.50 0.31 0.00 0.00 4.00 0.37 0.00 0.00 4.50 0.42 0.00 0.00 5.00 0.48 0.00 0.00 5.50 0.55 0.00 0.00 6.00 0.61 0.00 0.00 6.50 0.69 0.00 0.00 7.00 0.77 0.00 0.00 7.50 0.86 0.00 0.00 8.00 0.97 0.00 0.00 8.50 1.09 0.01 0.00 9.00 1.24 0.03 0.01 9.50 1.41 0.06 0.01 10.00 1.61 0.11 0.02 10.50 1.84 0.18 0.02 11.00 2.12 0.29 0.03 11.50 2.53 0.47 0.07 12.00 4.25 1.50 0.49 12.50 5.97 2.78 0.20 13.00 6.37 3.11 0.08 13.50 6.66 3.34 0.07 14.00 6.89 3.53 0.05 14.50 7.09 3.69 0.05 15.00 7.26 3.84 0.04 15.50 7.41 3.96 0.03 16.00 7.53 4.06 0.03 16.50 7.64 4.15 0.03 17.00 7.73 4.23 0.02 17.50 7.81 4.31 0.02 18.00 7.89 4.37 0.02 18.50 7.95 4.43 0.02 19.00 8.02 4.48 0.02 19.50 8.08 4.53 0.02 20.00 8.13 4.58 0.01 20.50 8.19 4.63 0.01 21.00 8.24 4.67 0.01 21.50 8.29 4.71 0.01 22.00 8.34 4.75 0.01 22.50 8.38 4.79 0.01 23.00 8.42 4.83 0.01 23.50 8.46 4.86 0.01 24.00 8.50 4.90 0.01 24.50 8.50 4.90 0.00 25.00 8.50 4.90 0.00 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 128HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: House Roof Area & Patio Runoff = 1.50 cfs @ 12.09 hrs, Volume= 0.107 af, Depth= 5.14" Routed to Pond CB2 : Pool Drain and Roof Leaders Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 100-Year Rainfall=8.50" Area (sf) CN Description * 4,443 98 House Area * 1,900 98 Patio-Pool Area 2,500 39 >75% Grass cover, Good, HSG A 2,000 30 Woods, Good, HSG A 10,843 72 Weighted Average 4,500 41.50% Pervious Area 6,343 58.50% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 2S: House Roof Area & Patio Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Type III 24-hr 100-Year Rainfall=8.50" Runoff Area=10,843 sf Runoff Volume=0.107 af Runoff Depth=5.14" Tc=6.0 min CN=72 1.50 cfs Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 129HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: House Roof Area & Patio Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.04 0.00 0.00 1.00 0.08 0.00 0.00 1.50 0.13 0.00 0.00 2.00 0.17 0.00 0.00 2.50 0.21 0.00 0.00 3.00 0.26 0.00 0.00 3.50 0.31 0.00 0.00 4.00 0.37 0.00 0.00 4.50 0.42 0.00 0.00 5.00 0.48 0.00 0.00 5.50 0.55 0.00 0.00 6.00 0.61 0.00 0.00 6.50 0.69 0.00 0.00 7.00 0.77 0.00 0.00 7.50 0.86 0.00 0.00 8.00 0.97 0.01 0.00 8.50 1.09 0.02 0.01 9.00 1.24 0.05 0.01 9.50 1.41 0.09 0.02 10.00 1.61 0.15 0.03 10.50 1.84 0.23 0.05 11.00 2.12 0.35 0.07 11.50 2.53 0.55 0.12 12.00 4.25 1.64 0.88 12.50 5.97 2.97 0.35 13.00 6.37 3.30 0.14 13.50 6.66 3.54 0.11 14.00 6.89 3.74 0.09 14.50 7.09 3.91 0.08 15.00 7.26 4.05 0.07 15.50 7.41 4.18 0.06 16.00 7.53 4.29 0.05 16.50 7.64 4.38 0.04 17.00 7.73 4.46 0.04 17.50 7.81 4.53 0.04 18.00 7.89 4.60 0.03 18.50 7.95 4.65 0.03 19.00 8.02 4.71 0.03 19.50 8.08 4.76 0.03 20.00 8.13 4.81 0.02 20.50 8.19 4.86 0.02 21.00 8.24 4.91 0.02 21.50 8.29 4.95 0.02 22.00 8.34 4.99 0.02 22.50 8.38 5.03 0.02 23.00 8.42 5.07 0.02 23.50 8.46 5.10 0.02 24.00 8.50 5.14 0.02 24.50 8.50 5.14 0.00 25.00 8.50 5.14 0.00 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 130HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Undeveloped Areas Runoff = 0.03 cfs @ 12.38 hrs, Volume= 0.008 af, Depth= 0.54" Routed to Reach 4R : Post-Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 100-Year Rainfall=8.50" Area (sf) CN Description 7,881 30 Woods, Good, HSG A 7,881 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 3S: Undeveloped Areas Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.038 0.036 0.034 0.032 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Type III 24-hr 100-Year Rainfall=8.50" Runoff Area=7,881 sf Runoff Volume=0.008 af Runoff Depth=0.54" Tc=6.0 min CN=30 0.03 cfs Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 131HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: Undeveloped Areas Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.04 0.00 0.00 1.00 0.08 0.00 0.00 1.50 0.13 0.00 0.00 2.00 0.17 0.00 0.00 2.50 0.21 0.00 0.00 3.00 0.26 0.00 0.00 3.50 0.31 0.00 0.00 4.00 0.37 0.00 0.00 4.50 0.42 0.00 0.00 5.00 0.48 0.00 0.00 5.50 0.55 0.00 0.00 6.00 0.61 0.00 0.00 6.50 0.69 0.00 0.00 7.00 0.77 0.00 0.00 7.50 0.86 0.00 0.00 8.00 0.97 0.00 0.00 8.50 1.09 0.00 0.00 9.00 1.24 0.00 0.00 9.50 1.41 0.00 0.00 10.00 1.61 0.00 0.00 10.50 1.84 0.00 0.00 11.00 2.12 0.00 0.00 11.50 2.53 0.00 0.00 12.00 4.25 0.00 0.00 12.50 5.97 0.07 0.03 13.00 6.37 0.12 0.02 13.50 6.66 0.16 0.01 14.00 6.89 0.19 0.01 14.50 7.09 0.23 0.01 15.00 7.26 0.26 0.01 15.50 7.41 0.29 0.01 16.00 7.53 0.31 0.01 16.50 7.64 0.34 0.01 17.00 7.73 0.36 0.01 17.50 7.81 0.37 0.01 18.00 7.89 0.39 0.01 18.50 7.95 0.41 0.01 19.00 8.02 0.42 0.01 19.50 8.08 0.44 0.01 20.00 8.13 0.45 0.00 20.50 8.19 0.46 0.00 21.00 8.24 0.47 0.00 21.50 8.29 0.49 0.00 22.00 8.34 0.50 0.00 22.50 8.38 0.51 0.00 23.00 8.42 0.52 0.00 23.50 8.46 0.53 0.00 24.00 8.50 0.54 0.00 24.50 8.50 0.54 0.00 25.00 8.50 0.54 0.00 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 132HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 1Dis: Pre- Dev Peak Discharge [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.577 ac, 17.55% Impervious, Inflow Depth = 1.79" for 100-Year event Inflow = 1.00 cfs @ 12.10 hrs, Volume= 0.086 af Outflow = 1.00 cfs @ 12.10 hrs, Volume= 0.086 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 1Dis: Pre- Dev Peak Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.577 ac 1.00 cfs 1.00 cfs Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 133HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 1Dis: Pre- Dev Peak Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.41 0.41 12.50 0.35 0.35 13.00 0.16 0.16 13.50 0.13 0.13 14.00 0.11 0.11 14.50 0.10 0.10 15.00 0.09 0.09 15.50 0.07 0.07 16.00 0.06 0.06 16.50 0.06 0.06 17.00 0.05 0.05 17.50 0.05 0.05 18.00 0.04 0.04 18.50 0.04 0.04 19.00 0.04 0.04 19.50 0.03 0.03 20.00 0.03 0.03 20.50 0.03 0.03 21.00 0.03 0.03 21.50 0.03 0.03 22.00 0.03 0.03 22.50 0.03 0.03 23.00 0.02 0.02 23.50 0.02 0.02 24.00 0.02 0.02 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 134HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 4R: Post-Discharge [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 0.577 ac, 38.78% Impervious, Inflow Depth = 0.33" for 100-Year event Inflow = 0.53 cfs @ 12.27 hrs, Volume= 0.016 af Outflow = 0.53 cfs @ 12.27 hrs, Volume= 0.016 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 4R: Post-Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.577 ac 0.53 cfs 0.53 cfs Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 135HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: Post-Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.20 0.20 13.00 0.02 0.02 13.50 0.01 0.01 14.00 0.01 0.01 14.50 0.01 0.01 15.00 0.01 0.01 15.50 0.01 0.01 16.00 0.01 0.01 16.50 0.01 0.01 17.00 0.01 0.01 17.50 0.01 0.01 18.00 0.01 0.01 18.50 0.01 0.01 19.00 0.01 0.01 19.50 0.01 0.01 20.00 0.00 0.00 20.50 0.00 0.00 21.00 0.00 0.00 21.50 0.00 0.00 22.00 0.00 0.00 22.50 0.00 0.00 23.00 0.00 0.00 23.50 0.00 0.00 24.00 0.00 0.00 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 136HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Inflow Area = 0.147 ac, 53.13% Impervious, Inflow Depth = 1.59" for 100-Year event Inflow = 0.65 cfs @ 12.15 hrs, Volume= 0.020 af Outflow = 0.08 cfs @ 12.71 hrs, Volume= 0.020 af, Atten= 88%, Lag= 34.0 min Discarded = 0.08 cfs @ 12.71 hrs, Volume= 0.020 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach 4R : Post-Discharge Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 104.74' @ 12.71 hrs Surf.Area= 154 sf Storage= 474 cf Plug-Flow detention time= 77.3 min calculated for 0.019 af (100% of inflow) Center-of-Mass det. time= 77.3 min ( 835.9 - 758.6 ) Volume Invert Avail.Storage Storage Description #1 99.00' 170 cf 6.00'D x 6.00'H Vertical Cone/Cylinder Inside #2 199 cf Overall - 3.0" Wall Thickness = 170 cf #2 99.00' 326 cf 14.00'D x 6.00'H Vertical Cone/Cylinder 924 cf Overall - 199 cf Embedded = 725 cf x 45.0% Voids 496 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 99.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 104.80'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.08 cfs @ 12.71 hrs HW=104.74' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.08 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=99.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 137HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.147 ac Peak Elev=104.74' Storage=474 cf 0.65 cfs 0.08 cfs 0.08 cfs 0.00 cfs Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Exfiltration Broad-Crested Rectangular Weir Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 138HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Wetted Storage Stage-Area-Storage Storage (cubic-feet) 450400350300250200150100500 Surface/Horizontal/Wetted Area (sq-ft) 400350300250200150100500 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Vertical Cone/Cylinder + Vertical Cone/Cylinder Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 139HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 99.00 0.00 0.00 0.00 0.50 0.00 0 99.00 0.00 0.00 0.00 1.00 0.00 0 99.00 0.00 0.00 0.00 1.50 0.00 0 99.00 0.00 0.00 0.00 2.00 0.00 0 99.00 0.00 0.00 0.00 2.50 0.00 0 99.00 0.00 0.00 0.00 3.00 0.00 0 99.00 0.00 0.00 0.00 3.50 0.00 0 99.00 0.00 0.00 0.00 4.00 0.00 0 99.00 0.00 0.00 0.00 4.50 0.00 0 99.00 0.00 0.00 0.00 5.00 0.00 0 99.00 0.00 0.00 0.00 5.50 0.00 0 99.00 0.00 0.00 0.00 6.00 0.00 0 99.00 0.00 0.00 0.00 6.50 0.00 0 99.00 0.00 0.00 0.00 7.00 0.00 0 99.00 0.00 0.00 0.00 7.50 0.00 0 99.00 0.00 0.00 0.00 8.00 0.00 0 99.00 0.00 0.00 0.00 8.50 0.00 0 99.00 0.00 0.00 0.00 9.00 0.00 0 99.00 0.00 0.00 0.00 9.50 0.00 0 99.00 0.00 0.00 0.00 10.00 0.00 0 99.00 0.00 0.00 0.00 10.50 0.00 0 99.00 0.00 0.00 0.00 11.00 0.00 0 99.00 0.00 0.00 0.00 11.50 0.00 0 99.00 0.00 0.00 0.00 12.00 0.00 0 99.00 0.00 0.00 0.00 12.50 0.18 446 104.39 0.07 0.07 0.00 13.00 0.05 460 104.57 0.08 0.08 0.00 13.50 0.03 397 103.81 0.07 0.07 0.00 14.00 0.02 324 102.92 0.06 0.06 0.00 14.50 0.01 246 101.98 0.05 0.05 0.00 15.00 0.01 172 101.09 0.05 0.05 0.00 15.50 0.00 102 100.23 0.04 0.04 0.00 16.00 0.00 36 99.44 0.03 0.03 0.00 16.50 0.00 0 99.00 0.00 0.00 0.00 17.00 0.00 0 99.00 0.00 0.00 0.00 17.50 0.00 0 99.00 0.00 0.00 0.00 18.00 0.00 0 99.00 0.00 0.00 0.00 18.50 0.00 0 99.00 0.00 0.00 0.00 19.00 0.00 0 99.00 0.00 0.00 0.00 19.50 0.00 0 99.00 0.00 0.00 0.00 20.00 0.00 0 99.00 0.00 0.00 0.00 20.50 0.00 0 99.00 0.00 0.00 0.00 21.00 0.00 0 99.00 0.00 0.00 0.00 21.50 0.00 0 99.00 0.00 0.00 0.00 22.00 0.00 0 99.00 0.00 0.00 0.00 22.50 0.00 0 99.00 0.00 0.00 0.00 23.00 0.00 0 99.00 0.00 0.00 0.00 23.50 0.00 0 99.00 0.00 0.00 0.00 24.00 0.00 0 99.00 0.00 0.00 0.00 24.50 0.00 0 99.00 0.00 0.00 0.00 25.00 0.00 0 99.00 0.00 0.00 0.00 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 140HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 99.00 0.00 0.00 0.00 99.10 0.03 0.03 0.00 99.20 0.03 0.03 0.00 99.30 0.03 0.03 0.00 99.40 0.03 0.03 0.00 99.50 0.03 0.03 0.00 99.60 0.03 0.03 0.00 99.70 0.04 0.04 0.00 99.80 0.04 0.04 0.00 99.90 0.04 0.04 0.00 100.00 0.04 0.04 0.00 100.10 0.04 0.04 0.00 100.20 0.04 0.04 0.00 100.30 0.04 0.04 0.00 100.40 0.04 0.04 0.00 100.50 0.04 0.04 0.00 100.60 0.04 0.04 0.00 100.70 0.04 0.04 0.00 100.80 0.04 0.04 0.00 100.90 0.05 0.05 0.00 101.00 0.05 0.05 0.00 101.10 0.05 0.05 0.00 101.20 0.05 0.05 0.00 101.30 0.05 0.05 0.00 101.40 0.05 0.05 0.00 101.50 0.05 0.05 0.00 101.60 0.05 0.05 0.00 101.70 0.05 0.05 0.00 101.80 0.05 0.05 0.00 101.90 0.05 0.05 0.00 102.00 0.05 0.05 0.00 102.10 0.06 0.06 0.00 102.20 0.06 0.06 0.00 102.30 0.06 0.06 0.00 102.40 0.06 0.06 0.00 102.50 0.06 0.06 0.00 102.60 0.06 0.06 0.00 102.70 0.06 0.06 0.00 102.80 0.06 0.06 0.00 102.90 0.06 0.06 0.00 103.00 0.06 0.06 0.00 103.10 0.06 0.06 0.00 103.20 0.06 0.06 0.00 103.30 0.07 0.07 0.00 103.40 0.07 0.07 0.00 103.50 0.07 0.07 0.00 103.60 0.07 0.07 0.00 103.70 0.07 0.07 0.00 103.80 0.07 0.07 0.00 103.90 0.07 0.07 0.00 104.00 0.07 0.07 0.00 104.10 0.07 0.07 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 104.20 0.07 0.07 0.00 104.30 0.07 0.07 0.00 104.40 0.07 0.07 0.00 104.50 0.08 0.08 0.00 104.60 0.08 0.08 0.00 104.70 0.08 0.08 0.00 104.80 0.08 0.08 0.00 104.90 1.07 0.08 0.99 105.00 2.87 0.08 2.79 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 141HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 99.00 154 0 99.10 158 8 99.20 163 17 99.30 167 25 99.40 172 33 99.50 176 41 99.60 180 50 99.70 185 58 99.80 189 66 99.90 194 74 100.00 198 83 100.10 202 91 100.20 207 99 100.30 211 107 100.40 216 116 100.50 220 124 100.60 224 132 100.70 229 140 100.80 233 149 100.90 238 157 101.00 242 165 101.10 246 173 101.20 251 182 101.30 255 190 101.40 259 198 101.50 264 207 101.60 268 215 101.70 273 223 101.80 277 231 101.90 281 240 102.00 286 248 102.10 290 256 102.20 295 264 102.30 299 273 102.40 303 281 102.50 308 289 102.60 312 297 102.70 317 306 102.80 321 314 102.90 325 322 103.00 330 330 103.10 334 339 103.20 339 347 103.30 343 355 103.40 347 364 103.50 352 372 103.60 356 380 103.70 361 388 103.80 365 397 103.90 369 405 104.00 374 413 104.10 378 421 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 104.20 383 430 104.30 387 438 104.40 391 446 104.50 396 454 104.60 400 463 104.70 405 471 104.80 409 479 104.90 413 487 105.00 418 496 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 142HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1SW: Grassed Swale Inflow Area = 0.147 ac, 53.13% Impervious, Inflow Depth = 4.90" for 100-Year event Inflow = 0.84 cfs @ 12.09 hrs, Volume= 0.060 af Outflow = 0.69 cfs @ 12.15 hrs, Volume= 0.056 af, Atten= 19%, Lag= 3.5 min Discarded = 0.04 cfs @ 12.15 hrs, Volume= 0.037 af Primary = 0.65 cfs @ 12.15 hrs, Volume= 0.020 af Routed to Pond CB1 : One (1) Solid Catch Basin with Hood Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 107.59' @ 12.15 hrs Surf.Area= 628 sf Storage= 690 cf Plug-Flow detention time= 147.2 min calculated for 0.056 af (94% of inflow) Center-of-Mass det. time= 113.3 min ( 935.4 - 822.2 ) Volume Invert Avail.Storage Storage Description #1 106.00' 974 cf Custom Stage Data (Irregular) Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 106.00 267 61.0 0 0 267 107.00 478 79.0 367 367 479 107.50 605 89.0 270 638 620 108.00 745 98.0 337 974 761 Device Routing Invert Outlet Devices #1 Discarded 106.00'2.410 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 107.50'24.0" x 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Discarded OutFlow Max=0.04 cfs @ 12.15 hrs HW=107.58' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.65 cfs @ 12.15 hrs HW=107.58' TW=105.96' (Dynamic Tailwater) 2=Orifice/Grate (Weir Controls 0.65 cfs @ 0.95 fps) Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 143HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.147 ac Peak Elev=107.59' Storage=690 cf 0.84 cfs 0.69 cfs 0.04 cfs 0.65 cfs Pond 1SW: Grassed Swale Total Discarded Primary Stage-Discharge Discharge (cfs) 9876543210 El e v a t i o n ( f e e t ) 108 107 106 Exfiltration Orifice/Grate Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 144HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1SW: Grassed Swale Surface Wetted Storage Stage-Area-Storage Storage (cubic-feet) 9008007006005004003002001000 Surface/Horizontal/Wetted Area (sq-ft) 7006005004003002001000 El e v a t i o n ( f e e t ) 108 107 106 Custom Stage Data Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 145HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1SW: Grassed Swale Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 106.00 0.00 0.00 0.00 0.50 0.00 0 106.00 0.00 0.00 0.00 1.00 0.00 0 106.00 0.00 0.00 0.00 1.50 0.00 0 106.00 0.00 0.00 0.00 2.00 0.00 0 106.00 0.00 0.00 0.00 2.50 0.00 0 106.00 0.00 0.00 0.00 3.00 0.00 0 106.00 0.00 0.00 0.00 3.50 0.00 0 106.00 0.00 0.00 0.00 4.00 0.00 0 106.00 0.00 0.00 0.00 4.50 0.00 0 106.00 0.00 0.00 0.00 5.00 0.00 0 106.00 0.00 0.00 0.00 5.50 0.00 0 106.00 0.00 0.00 0.00 6.00 0.00 0 106.00 0.00 0.00 0.00 6.50 0.00 0 106.00 0.00 0.00 0.00 7.00 0.00 0 106.00 0.00 0.00 0.00 7.50 0.00 0 106.00 0.00 0.00 0.00 8.00 0.00 0 106.00 0.00 0.00 0.00 8.50 0.00 1 106.00 0.00 0.00 0.00 9.00 0.01 1 106.00 0.01 0.01 0.00 9.50 0.01 2 106.01 0.01 0.01 0.00 10.00 0.02 3 106.01 0.02 0.02 0.00 10.50 0.02 11 106.04 0.02 0.02 0.00 11.00 0.03 36 106.13 0.02 0.02 0.00 11.50 0.07 91 106.31 0.02 0.02 0.00 12.00 0.49 396 107.06 0.03 0.03 0.00 12.50 0.20 660 107.54 0.22 0.04 0.18 13.00 0.08 647 107.52 0.09 0.03 0.05 13.50 0.07 644 107.51 0.07 0.03 0.03 14.00 0.05 643 107.51 0.05 0.03 0.02 14.50 0.05 641 107.51 0.05 0.03 0.01 15.00 0.04 640 107.50 0.04 0.03 0.01 15.50 0.03 638 107.50 0.04 0.03 0.00 16.00 0.03 633 107.49 0.03 0.03 0.00 16.50 0.03 620 107.47 0.03 0.03 0.00 17.00 0.02 603 107.44 0.03 0.03 0.00 17.50 0.02 582 107.41 0.03 0.03 0.00 18.00 0.02 558 107.36 0.03 0.03 0.00 18.50 0.02 531 107.32 0.03 0.03 0.00 19.00 0.02 504 107.27 0.03 0.03 0.00 19.50 0.02 477 107.22 0.03 0.03 0.00 20.00 0.01 450 107.17 0.03 0.03 0.00 20.50 0.01 423 107.11 0.03 0.03 0.00 21.00 0.01 397 107.06 0.03 0.03 0.00 21.50 0.01 371 107.01 0.03 0.03 0.00 22.00 0.01 345 106.95 0.03 0.03 0.00 22.50 0.01 319 106.90 0.03 0.03 0.00 23.00 0.01 294 106.84 0.02 0.02 0.00 23.50 0.01 269 106.78 0.02 0.02 0.00 24.00 0.01 244 106.72 0.02 0.02 0.00 24.50 0.00 206 106.63 0.02 0.02 0.00 25.00 0.00 168 106.53 0.02 0.02 0.00 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 146HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1SW: Grassed Swale Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 106.00 0.00 0.00 0.00 106.02 0.02 0.02 0.00 106.04 0.02 0.02 0.00 106.06 0.02 0.02 0.00 106.08 0.02 0.02 0.00 106.10 0.02 0.02 0.00 106.12 0.02 0.02 0.00 106.14 0.02 0.02 0.00 106.16 0.02 0.02 0.00 106.18 0.02 0.02 0.00 106.20 0.02 0.02 0.00 106.22 0.02 0.02 0.00 106.24 0.02 0.02 0.00 106.26 0.02 0.02 0.00 106.28 0.02 0.02 0.00 106.30 0.02 0.02 0.00 106.32 0.02 0.02 0.00 106.34 0.02 0.02 0.00 106.36 0.02 0.02 0.00 106.38 0.02 0.02 0.00 106.40 0.02 0.02 0.00 106.42 0.02 0.02 0.00 106.44 0.02 0.02 0.00 106.46 0.02 0.02 0.00 106.48 0.02 0.02 0.00 106.50 0.02 0.02 0.00 106.52 0.02 0.02 0.00 106.54 0.02 0.02 0.00 106.56 0.02 0.02 0.00 106.58 0.02 0.02 0.00 106.60 0.02 0.02 0.00 106.62 0.02 0.02 0.00 106.64 0.02 0.02 0.00 106.66 0.02 0.02 0.00 106.68 0.02 0.02 0.00 106.70 0.02 0.02 0.00 106.72 0.02 0.02 0.00 106.74 0.02 0.02 0.00 106.76 0.02 0.02 0.00 106.78 0.02 0.02 0.00 106.80 0.02 0.02 0.00 106.82 0.02 0.02 0.00 106.84 0.02 0.02 0.00 106.86 0.02 0.02 0.00 106.88 0.03 0.03 0.00 106.90 0.03 0.03 0.00 106.92 0.03 0.03 0.00 106.94 0.03 0.03 0.00 106.96 0.03 0.03 0.00 106.98 0.03 0.03 0.00 107.00 0.03 0.03 0.00 107.02 0.03 0.03 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 107.04 0.03 0.03 0.00 107.06 0.03 0.03 0.00 107.08 0.03 0.03 0.00 107.10 0.03 0.03 0.00 107.12 0.03 0.03 0.00 107.14 0.03 0.03 0.00 107.16 0.03 0.03 0.00 107.18 0.03 0.03 0.00 107.20 0.03 0.03 0.00 107.22 0.03 0.03 0.00 107.24 0.03 0.03 0.00 107.26 0.03 0.03 0.00 107.28 0.03 0.03 0.00 107.30 0.03 0.03 0.00 107.32 0.03 0.03 0.00 107.34 0.03 0.03 0.00 107.36 0.03 0.03 0.00 107.38 0.03 0.03 0.00 107.40 0.03 0.03 0.00 107.42 0.03 0.03 0.00 107.44 0.03 0.03 0.00 107.46 0.03 0.03 0.00 107.48 0.03 0.03 0.00 107.50 0.03 0.03 0.00 107.52 0.11 0.03 0.07 107.54 0.24 0.04 0.21 107.56 0.42 0.04 0.38 107.58 0.63 0.04 0.59 107.60 0.86 0.04 0.83 107.62 1.12 0.04 1.09 107.64 1.41 0.04 1.37 107.66 1.71 0.04 1.67 107.68 2.04 0.04 2.00 107.70 2.38 0.04 2.34 107.72 2.74 0.04 2.70 107.74 3.11 0.04 3.08 107.76 3.51 0.04 3.47 107.78 3.91 0.04 3.88 107.80 4.34 0.04 4.30 107.82 4.78 0.04 4.74 107.84 5.23 0.04 5.19 107.86 5.69 0.04 5.65 107.88 6.17 0.04 6.13 107.90 6.66 0.04 6.62 107.92 7.16 0.04 7.12 107.94 7.68 0.04 7.64 107.96 8.20 0.04 8.16 107.98 8.74 0.04 8.70 108.00 9.29 0.04 9.25 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 147HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1SW: Grassed Swale Elevation (feet) Surface (sq-ft) Wetted (sq-ft) Storage (cubic-feet) 106.00 267 267 0 106.05 276 276 14 106.10 285 286 28 106.15 295 295 42 106.20 304 305 57 106.25 314 315 73 106.30 324 325 88 106.35 334 335 105 106.40 344 345 122 106.45 354 356 139 106.50 365 366 157 106.55 376 377 176 106.60 386 388 195 106.65 397 399 214 106.70 408 410 235 106.75 420 421 255 106.80 431 433 277 106.85 442 444 298 106.90 454 456 321 106.95 466 467 344 107.00 478 479 367 107.05 490 493 392 107.10 502 506 416 107.15 515 520 442 107.20 527 533 468 107.25 540 547 495 107.30 552 561 522 107.35 565 576 550 107.40 578 590 578 107.45 592 605 608 107.50 605 620 638 107.55 618 633 668 107.60 632 647 699 107.65 645 661 731 107.70 659 675 764 107.75 673 689 797 107.80 687 703 831 107.85 701 717 866 107.90 716 732 901 107.95 730 747 938 108.00 745 761 974 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 148HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Inflow Area = 0.249 ac, 58.50% Impervious, Inflow Depth = 5.14" for 100-Year event Inflow = 1.50 cfs @ 12.09 hrs, Volume= 0.107 af Outflow = 0.71 cfs @ 12.27 hrs, Volume= 0.107 af, Atten= 53%, Lag= 11.2 min Discarded = 0.19 cfs @ 12.27 hrs, Volume= 0.099 af Primary = 0.52 cfs @ 12.27 hrs, Volume= 0.008 af Routed to Reach 4R : Post-Discharge Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 104.86' @ 12.27 hrs Surf.Area= 432 sf Storage= 1,375 cf Plug-Flow detention time= 62.6 min calculated for 0.106 af (100% of inflow) Center-of-Mass det. time= 62.6 min ( 880.6 - 818.0 ) Volume Invert Avail.Storage Storage Description #1 99.00' 898 cf 12.00'W x 36.00'L x 6.00'H Prismatoid 2,592 cf Overall - 597 cf Embedded = 1,995 cf x 45.0% Voids #2 99.00' 509 cf 6.00'D x 6.00'H Vertical Cone/Cylinder x 3 Inside #1 597 cf Overall - 3.0" Wall Thickness = 509 cf 1,407 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 99.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 104.80'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.19 cfs @ 12.27 hrs HW=104.86' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.19 cfs) Primary OutFlow Max=0.50 cfs @ 12.27 hrs HW=104.86' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir (Weir Controls 0.50 cfs @ 0.79 fps) Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 149HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.249 ac Peak Elev=104.86' Storage=1,375 cf 1.50 cfs 0.71 cfs 0.19 cfs 0.52 cfs Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Exfiltration Broad-Crested Rectangular Weir Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 150HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Wetted Storage Stage-Area-Storage Storage (cubic-feet) 1,4001,2001,0008006004002000 Surface/Horizontal/Wetted Area (sq-ft) 1,0009008007006005004003002001000 El e v a t i o n ( f e e t ) 105 104 103 102 101 100 99 Prismatoid + Vertical Cone/Cylinder Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 151HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 99.00 0.00 0.00 0.00 0.50 0.00 0 99.00 0.00 0.00 0.00 1.00 0.00 0 99.00 0.00 0.00 0.00 1.50 0.00 0 99.00 0.00 0.00 0.00 2.00 0.00 0 99.00 0.00 0.00 0.00 2.50 0.00 0 99.00 0.00 0.00 0.00 3.00 0.00 0 99.00 0.00 0.00 0.00 3.50 0.00 0 99.00 0.00 0.00 0.00 4.00 0.00 0 99.00 0.00 0.00 0.00 4.50 0.00 0 99.00 0.00 0.00 0.00 5.00 0.00 0 99.00 0.00 0.00 0.00 5.50 0.00 0 99.00 0.00 0.00 0.00 6.00 0.00 0 99.00 0.00 0.00 0.00 6.50 0.00 0 99.00 0.00 0.00 0.00 7.00 0.00 0 99.00 0.00 0.00 0.00 7.50 0.00 0 99.00 0.00 0.00 0.00 8.00 0.00 0 99.00 0.00 0.00 0.00 8.50 0.01 0 99.00 0.01 0.01 0.00 9.00 0.01 0 99.00 0.01 0.01 0.00 9.50 0.02 1 99.00 0.02 0.02 0.00 10.00 0.03 1 99.00 0.03 0.03 0.00 10.50 0.05 1 99.01 0.05 0.05 0.00 11.00 0.07 2 99.01 0.07 0.07 0.00 11.50 0.12 21 99.09 0.08 0.08 0.00 12.00 0.88 473 101.02 0.12 0.12 0.00 12.50 0.35 1,367 104.83 0.36 0.19 0.17 13.00 0.14 1,338 104.71 0.19 0.19 0.00 13.50 0.11 1,231 104.25 0.18 0.18 0.00 14.00 0.09 1,103 103.70 0.17 0.17 0.00 14.50 0.08 963 103.11 0.16 0.16 0.00 15.00 0.07 824 102.52 0.15 0.15 0.00 15.50 0.06 687 101.93 0.14 0.14 0.00 16.00 0.05 550 101.35 0.13 0.13 0.00 16.50 0.04 417 100.78 0.12 0.12 0.00 17.00 0.04 294 100.25 0.11 0.11 0.00 17.50 0.04 180 99.77 0.10 0.10 0.00 18.00 0.03 73 99.31 0.09 0.09 0.00 18.50 0.03 1 99.00 0.03 0.03 0.00 19.00 0.03 1 99.00 0.03 0.03 0.00 19.50 0.03 1 99.00 0.03 0.03 0.00 20.00 0.02 1 99.00 0.02 0.02 0.00 20.50 0.02 1 99.00 0.02 0.02 0.00 21.00 0.02 1 99.00 0.02 0.02 0.00 21.50 0.02 1 99.00 0.02 0.02 0.00 22.00 0.02 1 99.00 0.02 0.02 0.00 22.50 0.02 1 99.00 0.02 0.02 0.00 23.00 0.02 1 99.00 0.02 0.02 0.00 23.50 0.02 0 99.00 0.02 0.02 0.00 24.00 0.02 0 99.00 0.02 0.02 0.00 24.50 0.00 0 99.00 0.00 0.00 0.00 25.00 0.00 0 99.00 0.00 0.00 0.00 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 152HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 99.00 0.00 0.00 0.00 99.10 0.08 0.08 0.00 99.20 0.09 0.09 0.00 99.30 0.09 0.09 0.00 99.40 0.09 0.09 0.00 99.50 0.09 0.09 0.00 99.60 0.09 0.09 0.00 99.70 0.10 0.10 0.00 99.80 0.10 0.10 0.00 99.90 0.10 0.10 0.00 100.00 0.10 0.10 0.00 100.10 0.10 0.10 0.00 100.20 0.10 0.10 0.00 100.30 0.11 0.11 0.00 100.40 0.11 0.11 0.00 100.50 0.11 0.11 0.00 100.60 0.11 0.11 0.00 100.70 0.11 0.11 0.00 100.80 0.12 0.12 0.00 100.90 0.12 0.12 0.00 101.00 0.12 0.12 0.00 101.10 0.12 0.12 0.00 101.20 0.12 0.12 0.00 101.30 0.12 0.12 0.00 101.40 0.13 0.13 0.00 101.50 0.13 0.13 0.00 101.60 0.13 0.13 0.00 101.70 0.13 0.13 0.00 101.80 0.13 0.13 0.00 101.90 0.14 0.14 0.00 102.00 0.14 0.14 0.00 102.10 0.14 0.14 0.00 102.20 0.14 0.14 0.00 102.30 0.14 0.14 0.00 102.40 0.15 0.15 0.00 102.50 0.15 0.15 0.00 102.60 0.15 0.15 0.00 102.70 0.15 0.15 0.00 102.80 0.15 0.15 0.00 102.90 0.15 0.15 0.00 103.00 0.16 0.16 0.00 103.10 0.16 0.16 0.00 103.20 0.16 0.16 0.00 103.30 0.16 0.16 0.00 103.40 0.16 0.16 0.00 103.50 0.17 0.17 0.00 103.60 0.17 0.17 0.00 103.70 0.17 0.17 0.00 103.80 0.17 0.17 0.00 103.90 0.17 0.17 0.00 104.00 0.17 0.17 0.00 104.10 0.18 0.18 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 104.20 0.18 0.18 0.00 104.30 0.18 0.18 0.00 104.40 0.18 0.18 0.00 104.50 0.18 0.18 0.00 104.60 0.19 0.19 0.00 104.70 0.19 0.19 0.00 104.80 0.19 0.19 0.00 104.90 1.18 0.19 0.99 105.00 2.98 0.19 2.79 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 153HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 2P: (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 99.00 432 0 99.10 442 23 99.20 451 47 99.30 461 70 99.40 470 94 99.50 480 117 99.60 490 141 99.70 499 164 99.80 509 188 99.90 518 211 100.00 528 234 100.10 538 258 100.20 547 281 100.30 557 305 100.40 566 328 100.50 576 352 100.60 586 375 100.70 595 399 100.80 605 422 100.90 614 445 101.00 624 469 101.10 634 492 101.20 643 516 101.30 653 539 101.40 662 563 101.50 672 586 101.60 682 610 101.70 691 633 101.80 701 656 101.90 710 680 102.00 720 703 102.10 730 727 102.20 739 750 102.30 749 774 102.40 758 797 102.50 768 820 102.60 778 844 102.70 787 867 102.80 797 891 102.90 806 914 103.00 816 938 103.10 826 961 103.20 835 985 103.30 845 1,008 103.40 854 1,031 103.50 864 1,055 103.60 874 1,078 103.70 883 1,102 103.80 893 1,125 103.90 902 1,149 104.00 912 1,172 104.10 922 1,196 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 104.20 931 1,219 104.30 941 1,242 104.40 950 1,266 104.50 960 1,289 104.60 970 1,313 104.70 979 1,336 104.80 989 1,360 104.90 998 1,383 105.00 1,008 1,407 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 154HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB1: One (1) Solid Catch Basin with Hood Inflow Area = 0.147 ac, 53.13% Impervious, Inflow Depth = 1.59" for 100-Year event Inflow = 0.65 cfs @ 12.15 hrs, Volume= 0.020 af Outflow = 0.65 cfs @ 12.15 hrs, Volume= 0.020 af, Atten= 0%, Lag= 0.0 min Primary = 0.65 cfs @ 12.15 hrs, Volume= 0.020 af Routed to Pond 1P : (1) 14' x 6' Leaching Pit - (1) 6x6 Leach Pits, 4 feet of stone around Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 105.96' @ 12.15 hrs Flood Elev= 107.50' Device Routing Invert Outlet Devices #1 Primary 105.50'12.0" Round Culvert L= 20.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 105.50' / 105.00' S= 0.0250 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.79 sf Primary OutFlow Max=0.65 cfs @ 12.15 hrs HW=105.96' TW=99.86' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.65 cfs @ 1.83 fps) Pond CB1: One (1) Solid Catch Basin with Hood Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.147 ac Peak Elev=105.96' 12.0" Round Culvert n=0.020 L=20.0' S=0.0250 '/' 0.65 cfs 0.65 cfs Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 155HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB1: One (1) Solid Catch Basin with Hood Primary Stage-Discharge Discharge (cfs) 3210 El e v a t i o n ( f e e t ) 107 106 Culvert Pond CB1: One (1) Solid Catch Basin with Hood Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 107 106 Flood Elevation Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 156HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB1: One (1) Solid Catch Basin with Hood Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 105.50 0.00 0.50 0.00 105.50 0.00 1.00 0.00 105.50 0.00 1.50 0.00 105.50 0.00 2.00 0.00 105.50 0.00 2.50 0.00 105.50 0.00 3.00 0.00 105.50 0.00 3.50 0.00 105.50 0.00 4.00 0.00 105.50 0.00 4.50 0.00 105.50 0.00 5.00 0.00 105.50 0.00 5.50 0.00 105.50 0.00 6.00 0.00 105.50 0.00 6.50 0.00 105.50 0.00 7.00 0.00 105.50 0.00 7.50 0.00 105.50 0.00 8.00 0.00 105.50 0.00 8.50 0.00 105.50 0.00 9.00 0.00 105.50 0.00 9.50 0.00 105.50 0.00 10.00 0.00 105.50 0.00 10.50 0.00 105.50 0.00 11.00 0.00 105.50 0.00 11.50 0.00 105.50 0.00 12.00 0.00 105.50 0.00 12.50 0.18 105.73 0.18 13.00 0.05 105.62 0.05 13.50 0.03 105.59 0.03 14.00 0.02 105.58 0.02 14.50 0.01 105.56 0.01 15.00 0.01 105.54 0.01 15.50 0.00 105.52 0.00 16.00 0.00 105.50 0.00 16.50 0.00 105.50 0.00 17.00 0.00 105.50 0.00 17.50 0.00 105.50 0.00 18.00 0.00 105.50 0.00 18.50 0.00 105.50 0.00 19.00 0.00 105.50 0.00 19.50 0.00 105.50 0.00 20.00 0.00 105.50 0.00 20.50 0.00 105.50 0.00 21.00 0.00 105.50 0.00 21.50 0.00 105.50 0.00 22.00 0.00 105.50 0.00 22.50 0.00 105.50 0.00 23.00 0.00 105.50 0.00 23.50 0.00 105.50 0.00 24.00 0.00 105.50 0.00 24.50 0.00 105.50 0.00 25.00 0.00 105.50 0.00 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 157HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB1: One (1) Solid Catch Basin with Hood Elevation (feet) Primary (cfs) 105.50 0.00 105.51 0.00 105.52 0.00 105.53 0.00 105.54 0.01 105.55 0.01 105.56 0.01 105.57 0.02 105.58 0.02 105.59 0.03 105.60 0.03 105.61 0.04 105.62 0.05 105.63 0.06 105.64 0.07 105.65 0.08 105.66 0.09 105.67 0.10 105.68 0.11 105.69 0.12 105.70 0.13 105.71 0.15 105.72 0.16 105.73 0.18 105.74 0.19 105.75 0.21 105.76 0.22 105.77 0.24 105.78 0.26 105.79 0.27 105.80 0.29 105.81 0.31 105.82 0.33 105.83 0.35 105.84 0.37 105.85 0.39 105.86 0.41 105.87 0.43 105.88 0.45 105.89 0.48 105.90 0.50 105.91 0.52 105.92 0.55 105.93 0.57 105.94 0.59 105.95 0.62 105.96 0.64 105.97 0.67 105.98 0.69 105.99 0.72 106.00 0.75 106.01 0.77 Elevation (feet) Primary (cfs) 106.02 0.80 106.03 0.83 106.04 0.85 106.05 0.88 106.06 0.91 106.07 0.94 106.08 0.97 106.09 1.00 106.10 1.02 106.11 1.05 106.12 1.08 106.13 1.11 106.14 1.14 106.15 1.17 106.16 1.20 106.17 1.23 106.18 1.26 106.19 1.29 106.20 1.32 106.21 1.35 106.22 1.38 106.23 1.41 106.24 1.44 106.25 1.47 106.26 1.50 106.27 1.53 106.28 1.56 106.29 1.59 106.30 1.62 106.31 1.65 106.32 1.68 106.33 1.71 106.34 1.74 106.35 1.76 106.36 1.79 106.37 1.82 106.38 1.85 106.39 1.87 106.40 1.90 106.41 1.92 106.42 1.95 106.43 1.97 106.44 2.00 106.45 2.02 106.46 2.04 106.47 2.06 106.48 2.08 106.49 2.10 106.50 2.11 106.51 2.13 106.52 2.15 106.53 2.17 Elevation (feet) Primary (cfs) 106.54 2.19 106.55 2.21 106.56 2.23 106.57 2.25 106.58 2.27 106.59 2.29 106.60 2.31 106.61 2.33 106.62 2.35 106.63 2.37 106.64 2.39 106.65 2.41 106.66 2.43 106.67 2.44 106.68 2.46 106.69 2.48 106.70 2.50 106.71 2.52 106.72 2.53 106.73 2.55 106.74 2.57 106.75 2.59 106.76 2.60 106.77 2.62 106.78 2.64 106.79 2.65 106.80 2.67 106.81 2.69 106.82 2.70 106.83 2.72 106.84 2.74 106.85 2.75 106.86 2.77 106.87 2.78 106.88 2.80 106.89 2.82 106.90 2.83 106.91 2.85 106.92 2.86 106.93 2.88 106.94 2.89 106.95 2.91 106.96 2.93 106.97 2.94 106.98 2.96 106.99 2.97 107.00 2.99 107.01 3.00 107.02 3.02 107.03 3.03 107.04 3.04 107.05 3.06 Elevation (feet) Primary (cfs) 107.06 3.07 107.07 3.09 107.08 3.10 107.09 3.12 107.10 3.13 107.11 3.15 107.12 3.16 107.13 3.17 107.14 3.19 107.15 3.20 107.16 3.22 107.17 3.23 107.18 3.24 107.19 3.26 107.20 3.27 107.21 3.28 107.22 3.30 107.23 3.31 107.24 3.32 107.25 3.34 107.26 3.35 107.27 3.36 107.28 3.38 107.29 3.39 107.30 3.40 107.31 3.42 107.32 3.43 107.33 3.44 107.34 3.46 107.35 3.47 107.36 3.48 107.37 3.49 107.38 3.51 107.39 3.52 107.40 3.53 107.41 3.55 107.42 3.56 107.43 3.57 107.44 3.58 107.45 3.60 107.46 3.61 107.47 3.62 107.48 3.63 107.49 3.64 107.50 3.66 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 158HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB1: One (1) Solid Catch Basin with Hood Elevation (feet) Storage (acre-feet) 105.50 0.000 105.52 0.000 105.54 0.000 105.56 0.000 105.58 0.000 105.60 0.000 105.62 0.000 105.64 0.000 105.66 0.000 105.68 0.000 105.70 0.000 105.72 0.000 105.74 0.000 105.76 0.000 105.78 0.000 105.80 0.000 105.82 0.000 105.84 0.000 105.86 0.000 105.88 0.000 105.90 0.000 105.92 0.000 105.94 0.000 105.96 0.000 105.98 0.000 106.00 0.000 106.02 0.000 106.04 0.000 106.06 0.000 106.08 0.000 106.10 0.000 106.12 0.000 106.14 0.000 106.16 0.000 106.18 0.000 106.20 0.000 106.22 0.000 106.24 0.000 106.26 0.000 106.28 0.000 106.30 0.000 106.32 0.000 106.34 0.000 106.36 0.000 106.38 0.000 106.40 0.000 106.42 0.000 106.44 0.000 106.46 0.000 106.48 0.000 106.50 0.000 106.52 0.000 Elevation (feet) Storage (acre-feet) 106.54 0.000 106.56 0.000 106.58 0.000 106.60 0.000 106.62 0.000 106.64 0.000 106.66 0.000 106.68 0.000 106.70 0.000 106.72 0.000 106.74 0.000 106.76 0.000 106.78 0.000 106.80 0.000 106.82 0.000 106.84 0.000 106.86 0.000 106.88 0.000 106.90 0.000 106.92 0.000 106.94 0.000 106.96 0.000 106.98 0.000 107.00 0.000 107.02 0.000 107.04 0.000 107.06 0.000 107.08 0.000 107.10 0.000 107.12 0.000 107.14 0.000 107.16 0.000 107.18 0.000 107.20 0.000 107.22 0.000 107.24 0.000 107.26 0.000 107.28 0.000 107.30 0.000 107.32 0.000 107.34 0.000 107.36 0.000 107.38 0.000 107.40 0.000 107.42 0.000 107.44 0.000 107.46 0.000 107.48 0.000 107.50 0.000 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 159HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB2: Pool Drain and Roof Leaders Inflow Area = 0.249 ac, 58.50% Impervious, Inflow Depth = 5.14" for 100-Year event Inflow = 1.50 cfs @ 12.09 hrs, Volume= 0.107 af Outflow = 1.50 cfs @ 12.09 hrs, Volume= 0.107 af, Atten= 0%, Lag= 0.0 min Primary = 1.50 cfs @ 12.09 hrs, Volume= 0.107 af Routed to Pond 2P : (1) 36'x12' Leaching Facility - (3) 6x6 Leach Pits, 12' on center with 3' of stone around Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 111.00' @ 12.09 hrs Flood Elev= 111.00' Device Routing Invert Outlet Devices #1 Primary 110.50'6.0" Round Culvert X 4.00 L= 50.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 110.50' / 105.00' S= 0.1100 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.20 sf Primary OutFlow Max=1.49 cfs @ 12.09 hrs HW=111.00' TW=102.52' (Dynamic Tailwater) 1=Culvert (Inlet Controls 1.49 cfs @ 1.90 fps) Pond CB2: Pool Drain and Roof Leaders Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.249 ac Peak Elev=111.00' 6.0" Round Culvert x 4.00 n=0.020 L=50.0' S=0.1100 '/' 1.50 cfs 1.50 cfs Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 160HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB2: Pool Drain and Roof Leaders Primary Stage-Discharge Discharge (cfs) 10 El e v a t i o n ( f e e t ) 111 110.98 110.96 110.94 110.92 110.9 110.88 110.86 110.84 110.82 110.8 110.78 110.76 110.74 110.72 110.7 110.68 110.66 110.64 110.62 110.6 110.58 110.56 110.54 110.52 110.5 Culvert Pond CB2: Pool Drain and Roof Leaders Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 111 110.98 110.96 110.94 110.92 110.9 110.88 110.86 110.84 110.82 110.8 110.78 110.76 110.74 110.72 110.7 110.68 110.66 110.64 110.62 110.6 110.58 110.56 110.54 110.52 110.5 Flood Elevation Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 161HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB2: Pool Drain and Roof Leaders Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 110.50 0.00 0.50 0.00 110.50 0.00 1.00 0.00 110.50 0.00 1.50 0.00 110.50 0.00 2.00 0.00 110.50 0.00 2.50 0.00 110.50 0.00 3.00 0.00 110.50 0.00 3.50 0.00 110.50 0.00 4.00 0.00 110.50 0.00 4.50 0.00 110.50 0.00 5.00 0.00 110.50 0.00 5.50 0.00 110.50 0.00 6.00 0.00 110.50 0.00 6.50 0.00 110.50 0.00 7.00 0.00 110.50 0.00 7.50 0.00 110.51 0.00 8.00 0.00 110.52 0.00 8.50 0.01 110.53 0.01 9.00 0.01 110.54 0.01 9.50 0.02 110.55 0.02 10.00 0.03 110.56 0.03 10.50 0.05 110.57 0.05 11.00 0.07 110.58 0.07 11.50 0.12 110.61 0.12 12.00 0.88 110.84 0.88 12.50 0.35 110.70 0.35 13.00 0.14 110.62 0.14 13.50 0.11 110.61 0.11 14.00 0.09 110.60 0.09 14.50 0.08 110.59 0.08 15.00 0.07 110.59 0.07 15.50 0.06 110.58 0.06 16.00 0.05 110.57 0.05 16.50 0.04 110.57 0.04 17.00 0.04 110.56 0.04 17.50 0.04 110.56 0.04 18.00 0.03 110.56 0.03 18.50 0.03 110.55 0.03 19.00 0.03 110.55 0.03 19.50 0.03 110.55 0.03 20.00 0.02 110.55 0.02 20.50 0.02 110.55 0.02 21.00 0.02 110.55 0.02 21.50 0.02 110.55 0.02 22.00 0.02 110.55 0.02 22.50 0.02 110.54 0.02 23.00 0.02 110.54 0.02 23.50 0.02 110.54 0.02 24.00 0.02 110.54 0.02 24.50 0.00 110.50 0.00 25.00 0.00 110.50 0.00 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 162HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB2: Pool Drain and Roof Leaders Elevation (feet) Primary (cfs) 110.50 0.00 110.51 0.00 110.52 0.00 110.53 0.01 110.54 0.02 110.55 0.02 110.56 0.04 110.57 0.05 110.58 0.06 110.59 0.08 110.60 0.10 110.61 0.11 110.62 0.13 110.63 0.16 110.64 0.18 110.65 0.21 110.66 0.23 110.67 0.26 110.68 0.29 110.69 0.32 110.70 0.35 110.71 0.39 110.72 0.42 110.73 0.45 110.74 0.49 110.75 0.53 110.76 0.57 110.77 0.60 110.78 0.64 110.79 0.68 110.80 0.72 110.81 0.77 110.82 0.81 110.83 0.85 110.84 0.89 110.85 0.93 110.86 0.98 110.87 1.02 110.88 1.06 110.89 1.10 110.90 1.15 110.91 1.19 110.92 1.23 110.93 1.27 110.94 1.31 110.95 1.34 110.96 1.38 110.97 1.41 110.98 1.44 110.99 1.47 111.00 1.49 Type III 24-hr 100-Year Rainfall=8.50"9348.724 Long Pond Road - EASTWARD HOMES Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 163HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB2: Pool Drain and Roof Leaders Elevation (feet) Storage (acre-feet) 110.50 0.000 110.51 0.000 110.52 0.000 110.53 0.000 110.54 0.000 110.55 0.000 110.56 0.000 110.57 0.000 110.58 0.000 110.59 0.000 110.60 0.000 110.61 0.000 110.62 0.000 110.63 0.000 110.64 0.000 110.65 0.000 110.66 0.000 110.67 0.000 110.68 0.000 110.69 0.000 110.70 0.000 110.71 0.000 110.72 0.000 110.73 0.000 110.74 0.000 110.75 0.000 110.76 0.000 110.77 0.000 110.78 0.000 110.79 0.000 110.80 0.000 110.81 0.000 110.82 0.000 110.83 0.000 110.84 0.000 110.85 0.000 110.86 0.000 110.87 0.000 110.88 0.000 110.89 0.000 110.90 0.000 110.91 0.000 110.92 0.000 110.93 0.000 110.94 0.000 110.95 0.000 110.96 0.000 110.97 0.000 110.98 0.000 110.99 0.000 111.00 0.000 MAJOR STORMWATER MANAGEMENT PERMIT CASE NO. 2023-04 OWNER/APPLICANT: EASTWARD MBT LLC, TRUSTEE, EASTWARD COMPANIES BUSINESS TRUST PROPERTY: 736 LONG POND ROAD 1 Town of Brewster 2198 Main Street Brewster, MA 02631-1898 Phone: (508) 896-3701 x. 1133 STAFF REPORT TO: Planning Board FROM: Jon Idman, Town Planner RE: Major Stormwater Permit SWMP23-04 736 Long Pond Road (Map 75 Parcel 20) Applicant, Eastward Companies DATE: February 15, 2023 ______________________________________________________________________________ Recommendation The stormwater permit application meets the applicable performance standards and submission requirements set out in the town’s Stormwater Management Regulations for issuance and approval of a Major Stormwater Permit. Approval should be granted subject to the continuing obligations set out in said Regulations, including Sections 5.7, 5.8, 5.9 (Certificates of Compliance), Section 7.2 (Inspections), 8.3 (Recording of stormwater permit and O&M plan) and 8.5 therein. Major Stormwater Management Permit This project triggers a Stormwater Permit under Chapter 272 of the Brewster Code (Stormwater Management Bylaw) and according to Section 4 of the Bylaw’s supporting regulations, a Major Stormwater Permit is required because the project involves net new impervious surface of 2500 sq ft or greater. The underlying project is development of the single-family residential property. It is a currently undeveloped, ‘panhandle’ lot with access to Long Pond Road There is a wetland (a former cranberry bog) and wetland buffer zone in the northwest portion of the property. No development or site work is proposed within the wetland or within the 100’ buffer zone to the wetland. The property slopes southerly away from the wetland. The property is not located in a Zone II or the DCPC. Because the development project, including the stormwater management system, is not located within wetlands jurisdiction, the Planning Board is the stormwater permitting authority. Major Stormwater Permits are subject to review at a public meeting, including for any waivers requested. No waivers have been requested or have been identified as necessary in the case. The Applicant has provided the required application materials for a Major Stormwater Permits, including a site plan and stormwater management and hydrologic reports, as applicable, and as set out in Appendix B of the Stormwater Management Regulations. Proposed Site Plan entitled Eastward Companies, 736 Long Pond Road, Brewster, MA 02631, prepared and stamped by John M. O’Reilly, PE, PLS, J.M. O’Reilly & Associates, Inc. dated 1/27/23. The Applicant has provided construction-period BMPs in an erosion and sedimentation control plan consistent with the performance standards for Major Stormwater Permits set out in Section 6.1B of the Stormwater Management Regulations. Plan elements include straw wattles. Office of: Planning Board Planning Dept. 2 The Applicant proposes post-construction BMP’s and has provided a corresponding Operations and Maintenance Plan consistent with the performance standards for Major Stormwater Permits for new construction set out in Section 6.2B and Section 8.2 of the Stormwater Management Regulations: There are two separate stormwater systems proposed for the property. One system will collect roof run-off and direct it to subsurface leaching facilities for recharge. The other will collect run- off from the gravel driveway, treat it via water quality swales located in the panhandle portion of the lot and then convey the run-off to a subsurface leaching facility for recharge. The system meets the applicable standards in the Massachusetts Stormwater Handbook. The stormwater management system was designed under post-development conditions to handle all storms' peak discharges and runoff volume for the 2, 10, 25 and 100-year storm events. As designed, post-development volume and runoff rates are reduced to less than the pre- development conditions including for the 100-year storm; The O&M deals with long term maintenance of all post construction BMPs such as the subsurface recharge system and water quality treatment swale. The system incorporates Low Impact Development-type (LID) stormwater design elements, specifically water quality treatment swales. In addition to the state handbook stormwater standards, the system meets the treatment requirements (TSS and nutrients) set out in the Regulations. There are some scrivener’s errors on the site plan that should be and will be noted in the permit to avoid confusion: 1) the proposed driveway is gravel, not paved (the plan notes that it is alternately paved and gravel); 2) the southerly stormwater facility in the panhandle portion of the lot is also a ‘swale’ not a ‘channel’ (a swale provides water quality treatment due to its depth and construction; a channel is principally a means to convey stormwater). Brewster Stormwater Management Permit Application Form Approved 2/23/ 2022 Rev. 06/ 22/2022 Page 2 of 2 5. Type of Application (Check as applicable): Minor Stormwater Permit- Any combination or series of construction or land disturbance activities that, over a two-year period, will result in a net increase in impervious area of 500 sq.ft. to 2,500 sq.ft. and/or will result in land disturbances of 10,000 sq.ft. to 20,000 sq.ft. Major Stormwater Permit- Any alteration, disturbance, development, or redevelopment that does not meet the eligibility criteria for a Minor Stormwater Permit. SWM Permit Amendment- List existing Stormwater Management permit number/ type ____________________. Stormwater Management Certificate of Compliance (SMCC) Request- List relevant Stormwater Management permit number ________________________. 6. Brief Project Description, including any waiver requests: 7. Signatures: Applicant Date Property Owner (if different than Applicant) Date Professional Representative (as applicable) Date NOTES: Please refer to Appendix B of the Stormwater Management Regulations for detailed application submittal and supporting material requirements for Minor and Major Stormwater Management Permits, respectively. The application fee schedule is contained in Appendix C of the Regulations. Certain activities are exempt from review and permitting (See §272-6 of the Stormwater Management Bylaw). If the project is located, in whole or part, within an area subject to state or local wetlands protection law, the review and permitting authority is the Brewster Conservation Commission/ Conservation Department. No permit review shall occur nor shall review periods commence until the application is deemed complete. Post-Development Recharge Pre-Development Recharge 1Ex Existing Parcel Area 1S Half of Roof Runoff 2S Gravel Driveway & Landscape Aras 3S Undeveloped Areas of Parcel 1Dis Pre- Dev Peak Discharge 4R POST DEVELOPMENT PEAK DISCHARGE 1P One (1) 19.9' x 8.25' x 3' Leach Chamber System 2P One (1) 36.0' x 12.0' x 6' Leach Chamber System CB1 CB Roof Leader - 6" ADS Pipe CB2 CB Catch Basin At Lower Driveway Routing Diagram for 9349.736 Long Pond Road - EASTWARD HOMES - VACANT LOT Prepared by J M O'Reilly & Associates Inc, Printed 1/24/2023 HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Subcat Reach Pond Link 9349.736 Long Pond Road - EASTWARD HOMES - VACANT LOT Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 2HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.115 39 >75% Grass cover, Good, HSG A (2S) 0.125 76 Gravel roads, HSG A (2S) 0.030 98 Roof Area (1S) 2.857 30 Woods, Good, HSG A (1Ex, 3S) 9349.736 Long Pond Road - EASTWARD HOMES - VACANT LOT Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 3HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 3.097 HSG A 1Ex, 2S, 3S 0.000 HSG B 0.000 HSG C 0.000 HSG D 0.030 Other 1S Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 4HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1Ex: Existing Parcel Area Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Routed to Reach 1Dis : Pre- Dev Peak Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 2-Year Rainfall=3.60" Area (sf) CN Description 67,651 30 Woods, Good, HSG A 67,651 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1Ex: Existing Parcel Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Type III 24-hr 2-Year Rainfall=3.60" Runoff Area=67,651 sf Runoff Volume=0.000 af Runoff Depth=0.00" Tc=6.0 min CN=30 0.00 cfs Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 5HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1Ex: Existing Parcel Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.05 0.00 0.00 2.00 0.07 0.00 0.00 2.50 0.09 0.00 0.00 3.00 0.11 0.00 0.00 3.50 0.13 0.00 0.00 4.00 0.15 0.00 0.00 4.50 0.18 0.00 0.00 5.00 0.20 0.00 0.00 5.50 0.23 0.00 0.00 6.00 0.26 0.00 0.00 6.50 0.29 0.00 0.00 7.00 0.33 0.00 0.00 7.50 0.37 0.00 0.00 8.00 0.41 0.00 0.00 8.50 0.46 0.00 0.00 9.00 0.52 0.00 0.00 9.50 0.60 0.00 0.00 10.00 0.68 0.00 0.00 10.50 0.78 0.00 0.00 11.00 0.90 0.00 0.00 11.50 1.07 0.00 0.00 12.00 1.80 0.00 0.00 12.50 2.53 0.00 0.00 13.00 2.70 0.00 0.00 13.50 2.82 0.00 0.00 14.00 2.92 0.00 0.00 14.50 3.00 0.00 0.00 15.00 3.08 0.00 0.00 15.50 3.14 0.00 0.00 16.00 3.19 0.00 0.00 16.50 3.23 0.00 0.00 17.00 3.27 0.00 0.00 17.50 3.31 0.00 0.00 18.00 3.34 0.00 0.00 18.50 3.37 0.00 0.00 19.00 3.40 0.00 0.00 19.50 3.42 0.00 0.00 20.00 3.45 0.00 0.00 20.50 3.47 0.00 0.00 21.00 3.49 0.00 0.00 21.50 3.51 0.00 0.00 22.00 3.53 0.00 0.00 22.50 3.55 0.00 0.00 23.00 3.57 0.00 0.00 23.50 3.58 0.00 0.00 24.00 3.60 0.00 0.00 24.50 3.60 0.00 0.00 25.00 3.60 0.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 6HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Half of Roof Runoff Runoff = 0.11 cfs @ 12.08 hrs, Volume= 0.009 af, Depth= 3.37" Routed to Pond CB1 : Roof Leader - 6" ADS Pipe Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 2-Year Rainfall=3.60" Area (sf) CN Description * 1,325 98 Roof Area 1,325 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1S: Half of Roof Runoff Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr 2-Year Rainfall=3.60" Runoff Area=1,325 sf Runoff Volume=0.009 af Runoff Depth=3.37" Tc=6.0 min CN=98 0.11 cfs Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 7HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: Half of Roof Runoff Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.05 0.00 0.00 2.00 0.07 0.00 0.00 2.50 0.09 0.01 0.00 3.00 0.11 0.02 0.00 3.50 0.13 0.03 0.00 4.00 0.15 0.04 0.00 4.50 0.18 0.06 0.00 5.00 0.20 0.07 0.00 5.50 0.23 0.09 0.00 6.00 0.26 0.11 0.00 6.50 0.29 0.14 0.00 7.00 0.33 0.17 0.00 7.50 0.37 0.20 0.00 8.00 0.41 0.24 0.00 8.50 0.46 0.28 0.00 9.00 0.52 0.34 0.00 9.50 0.60 0.41 0.00 10.00 0.68 0.48 0.00 10.50 0.78 0.58 0.01 11.00 0.90 0.69 0.01 11.50 1.07 0.86 0.01 12.00 1.80 1.58 0.07 12.50 2.53 2.30 0.02 13.00 2.70 2.47 0.01 13.50 2.82 2.59 0.01 14.00 2.92 2.69 0.01 14.50 3.00 2.77 0.00 15.00 3.08 2.84 0.00 15.50 3.14 2.91 0.00 16.00 3.19 2.96 0.00 16.50 3.23 3.00 0.00 17.00 3.27 3.04 0.00 17.50 3.31 3.08 0.00 18.00 3.34 3.11 0.00 18.50 3.37 3.14 0.00 19.00 3.40 3.16 0.00 19.50 3.42 3.19 0.00 20.00 3.45 3.21 0.00 20.50 3.47 3.23 0.00 21.00 3.49 3.26 0.00 21.50 3.51 3.28 0.00 22.00 3.53 3.30 0.00 22.50 3.55 3.32 0.00 23.00 3.57 3.33 0.00 23.50 3.58 3.35 0.00 24.00 3.60 3.37 0.00 24.50 3.60 3.37 0.00 25.00 3.60 3.37 0.00 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 8HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Gravel Driveway & Landscape Aras Runoff = 0.09 cfs @ 12.12 hrs, Volume= 0.010 af, Depth= 0.49" Routed to Pond CB2 : Catch Basin At Lower Driveway Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 2-Year Rainfall=3.60" Area (sf) CN Description 5,465 76 Gravel roads, HSG A 5,000 39 >75% Grass cover, Good, HSG A 10,465 58 Weighted Average 10,465 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 2S: Gravel Driveway & Landscape Aras Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type III 24-hr 2-Year Rainfall=3.60" Runoff Area=10,465 sf Runoff Volume=0.010 af Runoff Depth=0.49" Tc=6.0 min CN=58 0.09 cfs Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 9HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: Gravel Driveway & Landscape Aras Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.05 0.00 0.00 2.00 0.07 0.00 0.00 2.50 0.09 0.00 0.00 3.00 0.11 0.00 0.00 3.50 0.13 0.00 0.00 4.00 0.15 0.00 0.00 4.50 0.18 0.00 0.00 5.00 0.20 0.00 0.00 5.50 0.23 0.00 0.00 6.00 0.26 0.00 0.00 6.50 0.29 0.00 0.00 7.00 0.33 0.00 0.00 7.50 0.37 0.00 0.00 8.00 0.41 0.00 0.00 8.50 0.46 0.00 0.00 9.00 0.52 0.00 0.00 9.50 0.60 0.00 0.00 10.00 0.68 0.00 0.00 10.50 0.78 0.00 0.00 11.00 0.90 0.00 0.00 11.50 1.07 0.00 0.00 12.00 1.80 0.02 0.02 12.50 2.53 0.14 0.04 13.00 2.70 0.18 0.02 13.50 2.82 0.22 0.02 14.00 2.92 0.25 0.01 14.50 3.00 0.27 0.01 15.00 3.08 0.30 0.01 15.50 3.14 0.32 0.01 16.00 3.19 0.34 0.01 16.50 3.23 0.35 0.01 17.00 3.27 0.37 0.01 17.50 3.31 0.38 0.01 18.00 3.34 0.39 0.01 18.50 3.37 0.40 0.01 19.00 3.40 0.41 0.00 19.50 3.42 0.42 0.00 20.00 3.45 0.43 0.00 20.50 3.47 0.44 0.00 21.00 3.49 0.45 0.00 21.50 3.51 0.46 0.00 22.00 3.53 0.47 0.00 22.50 3.55 0.47 0.00 23.00 3.57 0.48 0.00 23.50 3.58 0.49 0.00 24.00 3.60 0.49 0.00 24.50 3.60 0.49 0.00 25.00 3.60 0.49 0.00 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 10HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Undeveloped Areas of Parcel Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Routed to Reach 4R : POST DEVELOPMENT PEAK DISCHARGE Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 2-Year Rainfall=3.60" Area (sf) CN Description 56,801 30 Woods, Good, HSG A 56,801 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 3S: Undeveloped Areas of Parcel Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Type III 24-hr 2-Year Rainfall=3.60" Runoff Area=56,801 sf Runoff Volume=0.000 af Runoff Depth=0.00" Tc=6.0 min CN=30 0.00 cfs Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 11HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: Undeveloped Areas of Parcel Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.05 0.00 0.00 2.00 0.07 0.00 0.00 2.50 0.09 0.00 0.00 3.00 0.11 0.00 0.00 3.50 0.13 0.00 0.00 4.00 0.15 0.00 0.00 4.50 0.18 0.00 0.00 5.00 0.20 0.00 0.00 5.50 0.23 0.00 0.00 6.00 0.26 0.00 0.00 6.50 0.29 0.00 0.00 7.00 0.33 0.00 0.00 7.50 0.37 0.00 0.00 8.00 0.41 0.00 0.00 8.50 0.46 0.00 0.00 9.00 0.52 0.00 0.00 9.50 0.60 0.00 0.00 10.00 0.68 0.00 0.00 10.50 0.78 0.00 0.00 11.00 0.90 0.00 0.00 11.50 1.07 0.00 0.00 12.00 1.80 0.00 0.00 12.50 2.53 0.00 0.00 13.00 2.70 0.00 0.00 13.50 2.82 0.00 0.00 14.00 2.92 0.00 0.00 14.50 3.00 0.00 0.00 15.00 3.08 0.00 0.00 15.50 3.14 0.00 0.00 16.00 3.19 0.00 0.00 16.50 3.23 0.00 0.00 17.00 3.27 0.00 0.00 17.50 3.31 0.00 0.00 18.00 3.34 0.00 0.00 18.50 3.37 0.00 0.00 19.00 3.40 0.00 0.00 19.50 3.42 0.00 0.00 20.00 3.45 0.00 0.00 20.50 3.47 0.00 0.00 21.00 3.49 0.00 0.00 21.50 3.51 0.00 0.00 22.00 3.53 0.00 0.00 22.50 3.55 0.00 0.00 23.00 3.57 0.00 0.00 23.50 3.58 0.00 0.00 24.00 3.60 0.00 0.00 24.50 3.60 0.00 0.00 25.00 3.60 0.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 12HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 1Dis: Pre- Dev Peak Discharge Inflow Area = 1.553 ac, 0.00% Impervious, Inflow Depth = 0.00" for 2-Year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 1Dis: Pre- Dev Peak Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=1.553 ac 0.00 cfs 0.00 cfs Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 13HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 1Dis: Pre- Dev Peak Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.00 0.00 13.00 0.00 0.00 13.50 0.00 0.00 14.00 0.00 0.00 14.50 0.00 0.00 15.00 0.00 0.00 15.50 0.00 0.00 16.00 0.00 0.00 16.50 0.00 0.00 17.00 0.00 0.00 17.50 0.00 0.00 18.00 0.00 0.00 18.50 0.00 0.00 19.00 0.00 0.00 19.50 0.00 0.00 20.00 0.00 0.00 20.50 0.00 0.00 21.00 0.00 0.00 21.50 0.00 0.00 22.00 0.00 0.00 22.50 0.00 0.00 23.00 0.00 0.00 23.50 0.00 0.00 24.00 0.00 0.00 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 14HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 4R: POST DEVELOPMENT PEAK DISCHARGE Inflow Area = 1.544 ac, 0.00% Impervious, Inflow Depth = 0.00" for 2-Year event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 4R: POST DEVELOPMENT PEAK DISCHARGE Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=1.544 ac 0.00 cfs 0.00 cfs Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 15HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: POST DEVELOPMENT PEAK DISCHARGE Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.00 0.00 13.00 0.00 0.00 13.50 0.00 0.00 14.00 0.00 0.00 14.50 0.00 0.00 15.00 0.00 0.00 15.50 0.00 0.00 16.00 0.00 0.00 16.50 0.00 0.00 17.00 0.00 0.00 17.50 0.00 0.00 18.00 0.00 0.00 18.50 0.00 0.00 19.00 0.00 0.00 19.50 0.00 0.00 20.00 0.00 0.00 20.50 0.00 0.00 21.00 0.00 0.00 21.50 0.00 0.00 22.00 0.00 0.00 22.50 0.00 0.00 23.00 0.00 0.00 23.50 0.00 0.00 24.00 0.00 0.00 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 16HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Area = 0.030 ac,100.00% Impervious, Inflow Depth = 3.37" for 2-Year event Inflow = 0.11 cfs @ 12.08 hrs, Volume= 0.009 af Outflow = 0.04 cfs @ 12.35 hrs, Volume= 0.009 af, Atten= 66%, Lag= 16.0 min Discarded = 0.04 cfs @ 12.35 hrs, Volume= 0.009 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 101.48' @ 12.35 hrs Surf.Area= 164 sf Storage= 53 cf Plug-Flow detention time= 6.5 min calculated for 0.009 af (100% of inflow) Center-of-Mass det. time= 6.5 min ( 760.5 - 754.0 ) Volume Invert Avail.Storage Storage Description #1 101.00' 130 cf 8.25'W x 19.90'L x 3.00'H Prismatoid 493 cf Overall - 203 cf Embedded = 290 cf x 45.0% Voids #2 101.00' 203 cf 4.25'W x 7.95'L x 3.00'H Prismatoid x 2 Inside #1 333 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 101.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.04 cfs @ 12.35 hrs HW=101.48' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Discarded Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.030 ac Peak Elev=101.48' Storage=53 cf 0.11 cfs 0.04 cfs Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 17HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Discarded Stage-Discharge Discharge (cfs) 0.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050 El e v a t i o n ( f e e t ) 104 103 102 101 Exfiltration Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Wetted Storage Stage-Area-Storage Storage (cubic-feet) 300250200150100500 Surface/Horizontal/Wetted Area (sq-ft) 300250200150100500 El e v a t i o n ( f e e t ) 104 103 102 101 Prismatoid + Prismatoid Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 18HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 0.00 0.00 0 101.00 0.00 0.50 0.00 0 101.00 0.00 1.00 0.00 0 101.00 0.00 1.50 0.00 0 101.00 0.00 2.00 0.00 0 101.00 0.00 2.50 0.00 0 101.00 0.00 3.00 0.00 0 101.00 0.00 3.50 0.00 0 101.00 0.00 4.00 0.00 0 101.00 0.00 4.50 0.00 0 101.00 0.00 5.00 0.00 0 101.00 0.00 5.50 0.00 0 101.00 0.00 6.00 0.00 0 101.00 0.00 6.50 0.00 0 101.00 0.00 7.00 0.00 0 101.00 0.00 7.50 0.00 0 101.00 0.00 8.00 0.00 0 101.00 0.00 8.50 0.00 0 101.00 0.00 9.00 0.00 0 101.00 0.00 9.50 0.00 0 101.00 0.00 10.00 0.00 0 101.00 0.00 10.50 0.01 0 101.00 0.01 11.00 0.01 0 101.00 0.01 11.50 0.01 0 101.00 0.01 12.00 0.07 10 101.09 0.03 12.50 0.02 49 101.44 0.04 13.00 0.01 10 101.09 0.03 13.50 0.01 0 101.00 0.01 14.00 0.01 0 101.00 0.01 14.50 0.00 0 101.00 0.00 15.00 0.00 0 101.00 0.00 15.50 0.00 0 101.00 0.00 16.00 0.00 0 101.00 0.00 16.50 0.00 0 101.00 0.00 17.00 0.00 0 101.00 0.00 17.50 0.00 0 101.00 0.00 18.00 0.00 0 101.00 0.00 18.50 0.00 0 101.00 0.00 19.00 0.00 0 101.00 0.00 19.50 0.00 0 101.00 0.00 20.00 0.00 0 101.00 0.00 20.50 0.00 0 101.00 0.00 21.00 0.00 0 101.00 0.00 21.50 0.00 0 101.00 0.00 22.00 0.00 0 101.00 0.00 22.50 0.00 0 101.00 0.00 23.00 0.00 0 101.00 0.00 23.50 0.00 0 101.00 0.00 24.00 0.00 0 101.00 0.00 24.50 0.00 0 101.00 0.00 25.00 0.00 0 101.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 19HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Discarded (cfs) 101.00 0.00 101.02 0.03 101.04 0.03 101.06 0.03 101.08 0.03 101.10 0.03 101.12 0.03 101.14 0.03 101.16 0.03 101.18 0.03 101.20 0.03 101.22 0.03 101.24 0.03 101.26 0.03 101.28 0.03 101.30 0.03 101.32 0.03 101.34 0.04 101.36 0.04 101.38 0.04 101.40 0.04 101.42 0.04 101.44 0.04 101.46 0.04 101.48 0.04 101.50 0.04 101.52 0.04 101.54 0.04 101.56 0.04 101.58 0.04 101.60 0.04 101.62 0.04 101.64 0.04 101.66 0.04 101.68 0.04 101.70 0.04 101.72 0.04 101.74 0.04 101.76 0.04 101.78 0.04 101.80 0.04 101.82 0.04 101.84 0.04 101.86 0.04 101.88 0.04 101.90 0.04 101.92 0.04 101.94 0.04 101.96 0.04 101.98 0.04 102.00 0.04 102.02 0.04 Elevation (feet) Discarded (cfs) 102.04 0.04 102.06 0.04 102.08 0.04 102.10 0.04 102.12 0.04 102.14 0.04 102.16 0.04 102.18 0.04 102.20 0.04 102.22 0.04 102.24 0.04 102.26 0.05 102.28 0.05 102.30 0.05 102.32 0.05 102.34 0.05 102.36 0.05 102.38 0.05 102.40 0.05 102.42 0.05 102.44 0.05 102.46 0.05 102.48 0.05 102.50 0.05 102.52 0.05 102.54 0.05 102.56 0.05 102.58 0.05 102.60 0.05 102.62 0.05 102.64 0.05 102.66 0.05 102.68 0.05 102.70 0.05 102.72 0.05 102.74 0.05 102.76 0.05 102.78 0.05 102.80 0.05 102.82 0.05 102.84 0.05 102.86 0.05 102.88 0.05 102.90 0.05 102.92 0.05 102.94 0.05 102.96 0.05 102.98 0.05 103.00 0.05 103.02 0.05 103.04 0.05 103.06 0.05 Elevation (feet) Discarded (cfs) 103.08 0.05 103.10 0.05 103.12 0.05 103.14 0.05 103.16 0.05 103.18 0.05 103.20 0.06 103.22 0.06 103.24 0.06 103.26 0.06 103.28 0.06 103.30 0.06 103.32 0.06 103.34 0.06 103.36 0.06 103.38 0.06 103.40 0.06 103.42 0.06 103.44 0.06 103.46 0.06 103.48 0.06 103.50 0.06 103.52 0.06 103.54 0.06 103.56 0.06 103.58 0.06 103.60 0.06 103.62 0.06 103.64 0.06 103.66 0.06 103.68 0.06 103.70 0.06 103.72 0.06 103.74 0.06 103.76 0.06 103.78 0.06 103.80 0.06 103.82 0.06 103.84 0.06 103.86 0.06 103.88 0.06 103.90 0.06 103.92 0.06 103.94 0.06 103.96 0.06 103.98 0.06 104.00 0.06 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 20HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 101.00 164 0 101.05 167 6 101.10 170 11 101.15 173 17 101.20 175 22 101.25 178 28 101.30 181 33 101.35 184 39 101.40 187 44 101.45 190 50 101.50 192 56 101.55 195 61 101.60 198 67 101.65 201 72 101.70 204 78 101.75 206 83 101.80 209 89 101.85 212 94 101.90 215 100 101.95 218 105 102.00 220 111 102.05 223 117 102.10 226 122 102.15 229 128 102.20 232 133 102.25 235 139 102.30 237 144 102.35 240 150 102.40 243 155 102.45 246 161 102.50 249 167 102.55 251 172 102.60 254 178 102.65 257 183 102.70 260 189 102.75 263 194 102.80 266 200 102.85 268 205 102.90 271 211 102.95 274 217 103.00 277 222 103.05 280 228 103.10 282 233 103.15 285 239 103.20 288 244 103.25 291 250 103.30 294 255 103.35 296 261 103.40 299 267 103.45 302 272 103.50 305 278 103.55 308 283 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 103.60 311 289 103.65 313 294 103.70 316 300 103.75 319 305 103.80 322 311 103.85 325 316 103.90 327 322 103.95 330 328 104.00 333 333 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 21HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Inflow Area = 0.240 ac, 0.00% Impervious, Inflow Depth = 0.49" for 2-Year event Inflow = 0.09 cfs @ 12.12 hrs, Volume= 0.010 af Outflow = 0.08 cfs @ 12.15 hrs, Volume= 0.010 af, Atten= 3%, Lag= 1.4 min Discarded = 0.08 cfs @ 12.15 hrs, Volume= 0.010 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach 4R : POST DEVELOPMENT PEAK DISCHARGE Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 95.01' @ 12.15 hrs Surf.Area= 432 sf Storage= 3 cf Plug-Flow detention time= 0.5 min calculated for 0.010 af (100% of inflow) Center-of-Mass det. time= 0.5 min ( 916.1 - 915.6 ) Volume Invert Avail.Storage Storage Description #1 95.00' 937 cf 12.00'W x 36.00'L x 6.00'H Prismatoid 2,592 cf Overall - 509 cf Embedded = 2,083 cf x 45.0% Voids #2 95.00' 509 cf 6.00'D x 6.00'H Vertical Cone/Cylinder x 3 Inside #1 1,446 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 95.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 100.80'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.08 cfs @ 12.15 hrs HW=95.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.08 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=95.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 22HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.240 ac Peak Elev=95.01' Storage=3 cf 0.09 cfs 0.08 cfs 0.08 cfs 0.00 cfs Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 101 100 99 98 97 96 95 Exfiltration Broad-Crested Rectangular Weir Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 23HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Wetted Storage Stage-Area-Storage Storage (cubic-feet) 1,4001,2001,0008006004002000 Surface/Horizontal/Wetted Area (sq-ft) 1,0009008007006005004003002001000 El e v a t i o n ( f e e t ) 101 100 99 98 97 96 95 Prismatoid + Vertical Cone/Cylinder Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 24HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 95.00 0.00 0.00 0.00 0.50 0.00 0 95.00 0.00 0.00 0.00 1.00 0.00 0 95.00 0.00 0.00 0.00 1.50 0.00 0 95.00 0.00 0.00 0.00 2.00 0.00 0 95.00 0.00 0.00 0.00 2.50 0.00 0 95.00 0.00 0.00 0.00 3.00 0.00 0 95.00 0.00 0.00 0.00 3.50 0.00 0 95.00 0.00 0.00 0.00 4.00 0.00 0 95.00 0.00 0.00 0.00 4.50 0.00 0 95.00 0.00 0.00 0.00 5.00 0.00 0 95.00 0.00 0.00 0.00 5.50 0.00 0 95.00 0.00 0.00 0.00 6.00 0.00 0 95.00 0.00 0.00 0.00 6.50 0.00 0 95.00 0.00 0.00 0.00 7.00 0.00 0 95.00 0.00 0.00 0.00 7.50 0.00 0 95.00 0.00 0.00 0.00 8.00 0.00 0 95.00 0.00 0.00 0.00 8.50 0.00 0 95.00 0.00 0.00 0.00 9.00 0.00 0 95.00 0.00 0.00 0.00 9.50 0.00 0 95.00 0.00 0.00 0.00 10.00 0.00 0 95.00 0.00 0.00 0.00 10.50 0.00 0 95.00 0.00 0.00 0.00 11.00 0.00 0 95.00 0.00 0.00 0.00 11.50 0.00 0 95.00 0.00 0.00 0.00 12.00 0.02 0 95.00 0.01 0.01 0.00 12.50 0.04 1 95.01 0.04 0.04 0.00 13.00 0.02 1 95.00 0.02 0.02 0.00 13.50 0.02 0 95.00 0.02 0.02 0.00 14.00 0.01 0 95.00 0.01 0.01 0.00 14.50 0.01 0 95.00 0.01 0.01 0.00 15.00 0.01 0 95.00 0.01 0.01 0.00 15.50 0.01 0 95.00 0.01 0.01 0.00 16.00 0.01 0 95.00 0.01 0.01 0.00 16.50 0.01 0 95.00 0.01 0.01 0.00 17.00 0.01 0 95.00 0.01 0.01 0.00 17.50 0.01 0 95.00 0.01 0.01 0.00 18.00 0.01 0 95.00 0.01 0.01 0.00 18.50 0.01 0 95.00 0.01 0.01 0.00 19.00 0.00 0 95.00 0.00 0.00 0.00 19.50 0.00 0 95.00 0.00 0.00 0.00 20.00 0.00 0 95.00 0.00 0.00 0.00 20.50 0.00 0 95.00 0.00 0.00 0.00 21.00 0.00 0 95.00 0.00 0.00 0.00 21.50 0.00 0 95.00 0.00 0.00 0.00 22.00 0.00 0 95.00 0.00 0.00 0.00 22.50 0.00 0 95.00 0.00 0.00 0.00 23.00 0.00 0 95.00 0.00 0.00 0.00 23.50 0.00 0 95.00 0.00 0.00 0.00 24.00 0.00 0 95.00 0.00 0.00 0.00 24.50 0.00 0 95.00 0.00 0.00 0.00 25.00 0.00 0 95.00 0.00 0.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 25HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 95.00 0.00 0.00 0.00 95.10 0.08 0.08 0.00 95.20 0.09 0.09 0.00 95.30 0.09 0.09 0.00 95.40 0.09 0.09 0.00 95.50 0.09 0.09 0.00 95.60 0.09 0.09 0.00 95.70 0.10 0.10 0.00 95.80 0.10 0.10 0.00 95.90 0.10 0.10 0.00 96.00 0.10 0.10 0.00 96.10 0.10 0.10 0.00 96.20 0.10 0.10 0.00 96.30 0.11 0.11 0.00 96.40 0.11 0.11 0.00 96.50 0.11 0.11 0.00 96.60 0.11 0.11 0.00 96.70 0.11 0.11 0.00 96.80 0.12 0.12 0.00 96.90 0.12 0.12 0.00 97.00 0.12 0.12 0.00 97.10 0.12 0.12 0.00 97.20 0.12 0.12 0.00 97.30 0.12 0.12 0.00 97.40 0.13 0.13 0.00 97.50 0.13 0.13 0.00 97.60 0.13 0.13 0.00 97.70 0.13 0.13 0.00 97.80 0.13 0.13 0.00 97.90 0.14 0.14 0.00 98.00 0.14 0.14 0.00 98.10 0.14 0.14 0.00 98.20 0.14 0.14 0.00 98.30 0.14 0.14 0.00 98.40 0.15 0.15 0.00 98.50 0.15 0.15 0.00 98.60 0.15 0.15 0.00 98.70 0.15 0.15 0.00 98.80 0.15 0.15 0.00 98.90 0.15 0.15 0.00 99.00 0.16 0.16 0.00 99.10 0.16 0.16 0.00 99.20 0.16 0.16 0.00 99.30 0.16 0.16 0.00 99.40 0.16 0.16 0.00 99.50 0.17 0.17 0.00 99.60 0.17 0.17 0.00 99.70 0.17 0.17 0.00 99.80 0.17 0.17 0.00 99.90 0.17 0.17 0.00 100.00 0.17 0.17 0.00 100.10 0.18 0.18 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 100.20 0.18 0.18 0.00 100.30 0.18 0.18 0.00 100.40 0.18 0.18 0.00 100.50 0.18 0.18 0.00 100.60 0.19 0.19 0.00 100.70 0.19 0.19 0.00 100.80 0.19 0.19 0.00 100.90 1.18 0.19 0.99 101.00 2.98 0.19 2.79 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 26HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 95.00 432 0 95.10 442 24 95.20 451 48 95.30 461 72 95.40 470 96 95.50 480 121 95.60 490 145 95.70 499 169 95.80 509 193 95.90 518 217 96.00 528 241 96.10 538 265 96.20 547 289 96.30 557 313 96.40 566 337 96.50 576 362 96.60 586 386 96.70 595 410 96.80 605 434 96.90 614 458 97.00 624 482 97.10 634 506 97.20 643 530 97.30 653 554 97.40 662 579 97.50 672 603 97.60 682 627 97.70 691 651 97.80 701 675 97.90 710 699 98.00 720 723 98.10 730 747 98.20 739 771 98.30 749 795 98.40 758 820 98.50 768 844 98.60 778 868 98.70 787 892 98.80 797 916 98.90 806 940 99.00 816 964 99.10 826 988 99.20 835 1,012 99.30 845 1,037 99.40 854 1,061 99.50 864 1,085 99.60 874 1,109 99.70 883 1,133 99.80 893 1,157 99.90 902 1,181 100.00 912 1,205 100.10 922 1,229 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 100.20 931 1,253 100.30 941 1,278 100.40 950 1,302 100.50 960 1,326 100.60 970 1,350 100.70 979 1,374 100.80 989 1,398 100.90 998 1,422 101.00 1,008 1,446 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 27HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB1: Roof Leader - 6" ADS Pipe Inflow Area = 0.030 ac,100.00% Impervious, Inflow Depth = 3.37" for 2-Year event Inflow = 0.11 cfs @ 12.08 hrs, Volume= 0.009 af Outflow = 0.11 cfs @ 12.08 hrs, Volume= 0.009 af, Atten= 0%, Lag= 0.0 min Primary = 0.11 cfs @ 12.08 hrs, Volume= 0.009 af Routed to Pond 1P : One (1) 19.9' x 8.25' x 3' Leach Chamber System Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 105.11' @ 12.08 hrs Device Routing Invert Outlet Devices #1 Primary 105.00'6.0" Round Culvert X 4.00 L= 50.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 105.00' / 104.00' S= 0.0200 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.20 sf Primary OutFlow Max=0.11 cfs @ 12.08 hrs HW=105.11' TW=101.24' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.11 cfs @ 0.88 fps) Pond CB1: Roof Leader - 6" ADS Pipe Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.030 ac Peak Elev=105.11' 6.0" Round Culvert x 4.00 n=0.020 L=50.0' S=0.0200 '/' 0.11 cfs 0.11 cfs Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 28HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB1: Roof Leader - 6" ADS Pipe Primary Stage-Discharge Discharge (cfs) 10 El e v a t i o n ( f e e t ) 105.5 105.48 105.46 105.44 105.42 105.4 105.38 105.36 105.34 105.32 105.3 105.28 105.26 105.24 105.22 105.2 105.18 105.16 105.14 105.12 105.1 105.08 105.06 105.04 105.02 105 Culvert Pond CB1: Roof Leader - 6" ADS Pipe Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 105.5 105.48 105.46 105.44 105.42 105.4 105.38 105.36 105.34 105.32 105.3 105.28 105.26 105.24 105.22 105.2 105.18 105.16 105.14 105.12 105.1 105.08 105.06 105.04 105.02 105 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 29HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB1: Roof Leader - 6" ADS Pipe Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 105.00 0.00 0.50 0.00 105.00 0.00 1.00 0.00 105.00 0.00 1.50 0.00 105.00 0.00 2.00 0.00 105.01 0.00 2.50 0.00 105.01 0.00 3.00 0.00 105.01 0.00 3.50 0.00 105.01 0.00 4.00 0.00 105.01 0.00 4.50 0.00 105.01 0.00 5.00 0.00 105.01 0.00 5.50 0.00 105.01 0.00 6.00 0.00 105.01 0.00 6.50 0.00 105.01 0.00 7.00 0.00 105.02 0.00 7.50 0.00 105.02 0.00 8.00 0.00 105.02 0.00 8.50 0.00 105.02 0.00 9.00 0.00 105.02 0.00 9.50 0.00 105.02 0.00 10.00 0.00 105.02 0.00 10.50 0.01 105.03 0.01 11.00 0.01 105.03 0.01 11.50 0.01 105.04 0.01 12.00 0.07 105.08 0.07 12.50 0.02 105.05 0.02 13.00 0.01 105.03 0.01 13.50 0.01 105.03 0.01 14.00 0.01 105.03 0.01 14.50 0.00 105.02 0.00 15.00 0.00 105.02 0.00 15.50 0.00 105.02 0.00 16.00 0.00 105.02 0.00 16.50 0.00 105.02 0.00 17.00 0.00 105.02 0.00 17.50 0.00 105.02 0.00 18.00 0.00 105.02 0.00 18.50 0.00 105.01 0.00 19.00 0.00 105.01 0.00 19.50 0.00 105.01 0.00 20.00 0.00 105.01 0.00 20.50 0.00 105.01 0.00 21.00 0.00 105.01 0.00 21.50 0.00 105.01 0.00 22.00 0.00 105.01 0.00 22.50 0.00 105.01 0.00 23.00 0.00 105.01 0.00 23.50 0.00 105.01 0.00 24.00 0.00 105.01 0.00 24.50 0.00 105.00 0.00 25.00 0.00 105.00 0.00 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 30HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB1: Roof Leader - 6" ADS Pipe Elevation (feet) Primary (cfs) 105.00 0.00 105.01 0.00 105.02 0.00 105.03 0.01 105.04 0.01 105.05 0.02 105.06 0.03 105.07 0.05 105.08 0.06 105.09 0.08 105.10 0.10 105.11 0.11 105.12 0.13 105.13 0.16 105.14 0.18 105.15 0.21 105.16 0.23 105.17 0.26 105.18 0.29 105.19 0.32 105.20 0.35 105.21 0.39 105.22 0.42 105.23 0.45 105.24 0.49 105.25 0.53 105.26 0.57 105.27 0.60 105.28 0.64 105.29 0.68 105.30 0.72 105.31 0.77 105.32 0.81 105.33 0.85 105.34 0.89 105.35 0.93 105.36 0.98 105.37 1.02 105.38 1.06 105.39 1.10 105.40 1.15 105.41 1.19 105.42 1.23 105.43 1.27 105.44 1.31 105.45 1.34 105.46 1.38 105.47 1.41 105.48 1.44 105.49 1.47 105.50 1.49 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 31HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB1: Roof Leader - 6" ADS Pipe Elevation (feet) Storage (acre-feet) 105.00 0.000 105.01 0.000 105.02 0.000 105.03 0.000 105.04 0.000 105.05 0.000 105.06 0.000 105.07 0.000 105.08 0.000 105.09 0.000 105.10 0.000 105.11 0.000 105.12 0.000 105.13 0.000 105.14 0.000 105.15 0.000 105.16 0.000 105.17 0.000 105.18 0.000 105.19 0.000 105.20 0.000 105.21 0.000 105.22 0.000 105.23 0.000 105.24 0.000 105.25 0.000 105.26 0.000 105.27 0.000 105.28 0.000 105.29 0.000 105.30 0.000 105.31 0.000 105.32 0.000 105.33 0.000 105.34 0.000 105.35 0.000 105.36 0.000 105.37 0.000 105.38 0.000 105.39 0.000 105.40 0.000 105.41 0.000 105.42 0.000 105.43 0.000 105.44 0.000 105.45 0.000 105.46 0.000 105.47 0.000 105.48 0.000 105.49 0.000 105.50 0.000 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 32HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB2: Catch Basin At Lower Driveway Inflow Area = 0.240 ac, 0.00% Impervious, Inflow Depth = 0.49" for 2-Year event Inflow = 0.09 cfs @ 12.12 hrs, Volume= 0.010 af Outflow = 0.09 cfs @ 12.12 hrs, Volume= 0.010 af, Atten= 0%, Lag= 0.0 min Primary = 0.09 cfs @ 12.12 hrs, Volume= 0.010 af Routed to Pond 2P : One (1) 36.0' x 12.0' x 6' Leach Chamber System Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 105.61' @ 12.12 hrs Device Routing Invert Outlet Devices #1 Primary 105.50'12.0" Round Catch Basin X 2.00 L= 50.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 105.50' / 102.50' S= 0.0600 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.79 sf Primary OutFlow Max=0.09 cfs @ 12.12 hrs HW=105.61' TW=95.01' (Dynamic Tailwater) 1=Catch Basin (Inlet Controls 0.09 cfs @ 0.90 fps) Pond CB2: Catch Basin At Lower Driveway Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Inflow Area=0.240 ac Peak Elev=105.61' 12.0" Round Culvert x 2.00 n=0.020 L=50.0' S=0.0600 '/' 0.09 cfs 0.09 cfs Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 33HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB2: Catch Basin At Lower Driveway Primary Stage-Discharge Discharge (cfs) 43210 El e v a t i o n ( f e e t ) 106 Catch Basin Pond CB2: Catch Basin At Lower Driveway Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 106 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 34HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB2: Catch Basin At Lower Driveway Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 105.50 0.00 0.50 0.00 105.50 0.00 1.00 0.00 105.50 0.00 1.50 0.00 105.50 0.00 2.00 0.00 105.50 0.00 2.50 0.00 105.50 0.00 3.00 0.00 105.50 0.00 3.50 0.00 105.50 0.00 4.00 0.00 105.50 0.00 4.50 0.00 105.50 0.00 5.00 0.00 105.50 0.00 5.50 0.00 105.50 0.00 6.00 0.00 105.50 0.00 6.50 0.00 105.50 0.00 7.00 0.00 105.50 0.00 7.50 0.00 105.50 0.00 8.00 0.00 105.50 0.00 8.50 0.00 105.50 0.00 9.00 0.00 105.50 0.00 9.50 0.00 105.50 0.00 10.00 0.00 105.50 0.00 10.50 0.00 105.50 0.00 11.00 0.00 105.50 0.00 11.50 0.00 105.50 0.00 12.00 0.02 105.55 0.02 12.50 0.04 105.58 0.04 13.00 0.02 105.55 0.02 13.50 0.02 105.55 0.02 14.00 0.01 105.54 0.01 14.50 0.01 105.54 0.01 15.00 0.01 105.54 0.01 15.50 0.01 105.54 0.01 16.00 0.01 105.53 0.01 16.50 0.01 105.53 0.01 17.00 0.01 105.53 0.01 17.50 0.01 105.53 0.01 18.00 0.01 105.53 0.01 18.50 0.01 105.53 0.01 19.00 0.00 105.53 0.00 19.50 0.00 105.53 0.00 20.00 0.00 105.52 0.00 20.50 0.00 105.52 0.00 21.00 0.00 105.52 0.00 21.50 0.00 105.52 0.00 22.00 0.00 105.52 0.00 22.50 0.00 105.52 0.00 23.00 0.00 105.52 0.00 23.50 0.00 105.52 0.00 24.00 0.00 105.52 0.00 24.50 0.00 105.50 0.00 25.00 0.00 105.50 0.00 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 35HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB2: Catch Basin At Lower Driveway Elevation (feet) Primary (cfs) 105.50 0.00 105.51 0.00 105.52 0.00 105.53 0.01 105.54 0.01 105.55 0.02 105.56 0.03 105.57 0.03 105.58 0.04 105.59 0.06 105.60 0.07 105.61 0.08 105.62 0.10 105.63 0.12 105.64 0.13 105.65 0.15 105.66 0.17 105.67 0.20 105.68 0.22 105.69 0.24 105.70 0.27 105.71 0.30 105.72 0.32 105.73 0.35 105.74 0.38 105.75 0.41 105.76 0.44 105.77 0.48 105.78 0.51 105.79 0.55 105.80 0.58 105.81 0.62 105.82 0.66 105.83 0.70 105.84 0.74 105.85 0.78 105.86 0.82 105.87 0.86 105.88 0.91 105.89 0.95 105.90 1.00 105.91 1.04 105.92 1.09 105.93 1.14 105.94 1.19 105.95 1.24 105.96 1.29 105.97 1.34 105.98 1.39 105.99 1.44 106.00 1.49 106.01 1.55 Elevation (feet) Primary (cfs) 106.02 1.60 106.03 1.65 106.04 1.71 106.05 1.76 106.06 1.82 106.07 1.88 106.08 1.93 106.09 1.99 106.10 2.05 106.11 2.11 106.12 2.17 106.13 2.22 106.14 2.28 106.15 2.34 106.16 2.40 106.17 2.46 106.18 2.52 106.19 2.58 106.20 2.64 106.21 2.70 106.22 2.76 106.23 2.82 106.24 2.88 106.25 2.94 106.26 3.00 106.27 3.06 106.28 3.12 106.29 3.18 106.30 3.24 106.31 3.30 106.32 3.36 106.33 3.41 106.34 3.47 106.35 3.53 106.36 3.58 106.37 3.64 106.38 3.69 106.39 3.74 106.40 3.80 106.41 3.85 106.42 3.90 106.43 3.95 106.44 3.99 106.45 4.04 106.46 4.08 106.47 4.12 106.48 4.16 106.49 4.19 106.50 4.22 Type III 24-hr 2-Year Rainfall=3.60"9349.736 Long Pond Road - EASTWARD HOMES - VAC Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 36HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB2: Catch Basin At Lower Driveway Elevation (feet) Storage (acre-feet) 105.50 0.000 105.51 0.000 105.52 0.000 105.53 0.000 105.54 0.000 105.55 0.000 105.56 0.000 105.57 0.000 105.58 0.000 105.59 0.000 105.60 0.000 105.61 0.000 105.62 0.000 105.63 0.000 105.64 0.000 105.65 0.000 105.66 0.000 105.67 0.000 105.68 0.000 105.69 0.000 105.70 0.000 105.71 0.000 105.72 0.000 105.73 0.000 105.74 0.000 105.75 0.000 105.76 0.000 105.77 0.000 105.78 0.000 105.79 0.000 105.80 0.000 105.81 0.000 105.82 0.000 105.83 0.000 105.84 0.000 105.85 0.000 105.86 0.000 105.87 0.000 105.88 0.000 105.89 0.000 105.90 0.000 105.91 0.000 105.92 0.000 105.93 0.000 105.94 0.000 105.95 0.000 105.96 0.000 105.97 0.000 105.98 0.000 105.99 0.000 106.00 0.000 106.01 0.000 Elevation (feet) Storage (acre-feet) 106.02 0.000 106.03 0.000 106.04 0.000 106.05 0.000 106.06 0.000 106.07 0.000 106.08 0.000 106.09 0.000 106.10 0.000 106.11 0.000 106.12 0.000 106.13 0.000 106.14 0.000 106.15 0.000 106.16 0.000 106.17 0.000 106.18 0.000 106.19 0.000 106.20 0.000 106.21 0.000 106.22 0.000 106.23 0.000 106.24 0.000 106.25 0.000 106.26 0.000 106.27 0.000 106.28 0.000 106.29 0.000 106.30 0.000 106.31 0.000 106.32 0.000 106.33 0.000 106.34 0.000 106.35 0.000 106.36 0.000 106.37 0.000 106.38 0.000 106.39 0.000 106.40 0.000 106.41 0.000 106.42 0.000 106.43 0.000 106.44 0.000 106.45 0.000 106.46 0.000 106.47 0.000 106.48 0.000 106.49 0.000 106.50 0.000 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 37HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1Ex: Existing Parcel Area Runoff = 0.00 cfs @ 22.06 hrs, Volume= 0.002 af, Depth= 0.02" Routed to Reach 1Dis : Pre- Dev Peak Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 10-Year Rainfall=5.30" Area (sf) CN Description 67,651 30 Woods, Good, HSG A 67,651 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1Ex: Existing Parcel Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.004 0.004 0.004 0.004 0.004 0.003 0.003 0.003 0.003 0.003 0.002 0.002 0.002 0.002 0.002 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0 Type III 24-hr 10-Year Rainfall=5.30" Runoff Area=67,651 sf Runoff Volume=0.002 af Runoff Depth=0.02" Tc=6.0 min CN=30 0.00 cfs Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 38HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1Ex: Existing Parcel Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.05 0.00 0.00 1.50 0.08 0.00 0.00 2.00 0.11 0.00 0.00 2.50 0.13 0.00 0.00 3.00 0.16 0.00 0.00 3.50 0.19 0.00 0.00 4.00 0.23 0.00 0.00 4.50 0.26 0.00 0.00 5.00 0.30 0.00 0.00 5.50 0.34 0.00 0.00 6.00 0.38 0.00 0.00 6.50 0.43 0.00 0.00 7.00 0.48 0.00 0.00 7.50 0.54 0.00 0.00 8.00 0.60 0.00 0.00 8.50 0.68 0.00 0.00 9.00 0.77 0.00 0.00 9.50 0.88 0.00 0.00 10.00 1.00 0.00 0.00 10.50 1.15 0.00 0.00 11.00 1.33 0.00 0.00 11.50 1.58 0.00 0.00 12.00 2.65 0.00 0.00 12.50 3.72 0.00 0.00 13.00 3.97 0.00 0.00 13.50 4.15 0.00 0.00 14.00 4.30 0.00 0.00 14.50 4.42 0.00 0.00 15.00 4.53 0.00 0.00 15.50 4.62 0.00 0.00 16.00 4.70 0.00 0.00 16.50 4.76 0.00 0.00 17.00 4.82 0.00 0.00 17.50 4.87 0.00 0.00 18.00 4.92 0.00 0.00 18.50 4.96 0.00 0.00 19.00 5.00 0.00 0.00 19.50 5.04 0.01 0.00 20.00 5.07 0.01 0.00 20.50 5.11 0.01 0.00 21.00 5.14 0.01 0.00 21.50 5.17 0.01 0.00 22.00 5.20 0.01 0.00 22.50 5.23 0.01 0.00 23.00 5.25 0.01 0.00 23.50 5.28 0.02 0.00 24.00 5.30 0.02 0.00 24.50 5.30 0.02 0.00 25.00 5.30 0.02 0.00 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 39HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Half of Roof Runoff Runoff = 0.16 cfs @ 12.08 hrs, Volume= 0.013 af, Depth= 5.06" Routed to Pond CB1 : Roof Leader - 6" ADS Pipe Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 10-Year Rainfall=5.30" Area (sf) CN Description * 1,325 98 Roof Area 1,325 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1S: Half of Roof Runoff Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type III 24-hr 10-Year Rainfall=5.30" Runoff Area=1,325 sf Runoff Volume=0.013 af Runoff Depth=5.06" Tc=6.0 min CN=98 0.16 cfs Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 40HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: Half of Roof Runoff Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.05 0.00 0.00 1.50 0.08 0.01 0.00 2.00 0.11 0.02 0.00 2.50 0.13 0.03 0.00 3.00 0.16 0.05 0.00 3.50 0.19 0.07 0.00 4.00 0.23 0.09 0.00 4.50 0.26 0.12 0.00 5.00 0.30 0.15 0.00 5.50 0.34 0.18 0.00 6.00 0.38 0.21 0.00 6.50 0.43 0.25 0.00 7.00 0.48 0.30 0.00 7.50 0.54 0.35 0.00 8.00 0.60 0.41 0.00 8.50 0.68 0.49 0.00 9.00 0.77 0.57 0.01 9.50 0.88 0.67 0.01 10.00 1.00 0.79 0.01 10.50 1.15 0.93 0.01 11.00 1.33 1.11 0.01 11.50 1.58 1.36 0.02 12.00 2.65 2.42 0.10 12.50 3.72 3.49 0.03 13.00 3.97 3.74 0.01 13.50 4.15 3.92 0.01 14.00 4.30 4.06 0.01 14.50 4.42 4.18 0.01 15.00 4.53 4.29 0.01 15.50 4.62 4.38 0.01 16.00 4.70 4.46 0.00 16.50 4.76 4.52 0.00 17.00 4.82 4.58 0.00 17.50 4.87 4.64 0.00 18.00 4.92 4.68 0.00 18.50 4.96 4.72 0.00 19.00 5.00 4.76 0.00 19.50 5.04 4.80 0.00 20.00 5.07 4.84 0.00 20.50 5.11 4.87 0.00 21.00 5.14 4.90 0.00 21.50 5.17 4.93 0.00 22.00 5.20 4.96 0.00 22.50 5.23 4.99 0.00 23.00 5.25 5.01 0.00 23.50 5.28 5.04 0.00 24.00 5.30 5.06 0.00 24.50 5.30 5.06 0.00 25.00 5.30 5.06 0.00 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 41HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Gravel Driveway & Landscape Aras Runoff = 0.33 cfs @ 12.10 hrs, Volume= 0.027 af, Depth= 1.34" Routed to Pond CB2 : Catch Basin At Lower Driveway Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 10-Year Rainfall=5.30" Area (sf) CN Description 5,465 76 Gravel roads, HSG A 5,000 39 >75% Grass cover, Good, HSG A 10,465 58 Weighted Average 10,465 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 2S: Gravel Driveway & Landscape Aras Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 10-Year Rainfall=5.30" Runoff Area=10,465 sf Runoff Volume=0.027 af Runoff Depth=1.34" Tc=6.0 min CN=58 0.33 cfs Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 42HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: Gravel Driveway & Landscape Aras Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.05 0.00 0.00 1.50 0.08 0.00 0.00 2.00 0.11 0.00 0.00 2.50 0.13 0.00 0.00 3.00 0.16 0.00 0.00 3.50 0.19 0.00 0.00 4.00 0.23 0.00 0.00 4.50 0.26 0.00 0.00 5.00 0.30 0.00 0.00 5.50 0.34 0.00 0.00 6.00 0.38 0.00 0.00 6.50 0.43 0.00 0.00 7.00 0.48 0.00 0.00 7.50 0.54 0.00 0.00 8.00 0.60 0.00 0.00 8.50 0.68 0.00 0.00 9.00 0.77 0.00 0.00 9.50 0.88 0.00 0.00 10.00 1.00 0.00 0.00 10.50 1.15 0.00 0.00 11.00 1.33 0.00 0.00 11.50 1.58 0.00 0.00 12.00 2.65 0.17 0.15 12.50 3.72 0.54 0.11 13.00 3.97 0.65 0.05 13.50 4.15 0.74 0.04 14.00 4.30 0.80 0.03 14.50 4.42 0.86 0.03 15.00 4.53 0.92 0.03 15.50 4.62 0.97 0.02 16.00 4.70 1.01 0.02 16.50 4.76 1.04 0.02 17.00 4.82 1.07 0.01 17.50 4.87 1.10 0.01 18.00 4.92 1.12 0.01 18.50 4.96 1.15 0.01 19.00 5.00 1.17 0.01 19.50 5.04 1.19 0.01 20.00 5.07 1.21 0.01 20.50 5.11 1.23 0.01 21.00 5.14 1.25 0.01 21.50 5.17 1.26 0.01 22.00 5.20 1.28 0.01 22.50 5.23 1.29 0.01 23.00 5.25 1.31 0.01 23.50 5.28 1.32 0.01 24.00 5.30 1.34 0.01 24.50 5.30 1.34 0.00 25.00 5.30 1.34 0.00 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 43HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Undeveloped Areas of Parcel Runoff = 0.00 cfs @ 22.06 hrs, Volume= 0.002 af, Depth= 0.02" Routed to Reach 4R : POST DEVELOPMENT PEAK DISCHARGE Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 10-Year Rainfall=5.30" Area (sf) CN Description 56,801 30 Woods, Good, HSG A 56,801 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 3S: Undeveloped Areas of Parcel Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.004 0.003 0.003 0.003 0.003 0.003 0.002 0.002 0.002 0.002 0.002 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0 Type III 24-hr 10-Year Rainfall=5.30" Runoff Area=56,801 sf Runoff Volume=0.002 af Runoff Depth=0.02" Tc=6.0 min CN=30 0.00 cfs Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 44HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: Undeveloped Areas of Parcel Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.05 0.00 0.00 1.50 0.08 0.00 0.00 2.00 0.11 0.00 0.00 2.50 0.13 0.00 0.00 3.00 0.16 0.00 0.00 3.50 0.19 0.00 0.00 4.00 0.23 0.00 0.00 4.50 0.26 0.00 0.00 5.00 0.30 0.00 0.00 5.50 0.34 0.00 0.00 6.00 0.38 0.00 0.00 6.50 0.43 0.00 0.00 7.00 0.48 0.00 0.00 7.50 0.54 0.00 0.00 8.00 0.60 0.00 0.00 8.50 0.68 0.00 0.00 9.00 0.77 0.00 0.00 9.50 0.88 0.00 0.00 10.00 1.00 0.00 0.00 10.50 1.15 0.00 0.00 11.00 1.33 0.00 0.00 11.50 1.58 0.00 0.00 12.00 2.65 0.00 0.00 12.50 3.72 0.00 0.00 13.00 3.97 0.00 0.00 13.50 4.15 0.00 0.00 14.00 4.30 0.00 0.00 14.50 4.42 0.00 0.00 15.00 4.53 0.00 0.00 15.50 4.62 0.00 0.00 16.00 4.70 0.00 0.00 16.50 4.76 0.00 0.00 17.00 4.82 0.00 0.00 17.50 4.87 0.00 0.00 18.00 4.92 0.00 0.00 18.50 4.96 0.00 0.00 19.00 5.00 0.00 0.00 19.50 5.04 0.01 0.00 20.00 5.07 0.01 0.00 20.50 5.11 0.01 0.00 21.00 5.14 0.01 0.00 21.50 5.17 0.01 0.00 22.00 5.20 0.01 0.00 22.50 5.23 0.01 0.00 23.00 5.25 0.01 0.00 23.50 5.28 0.02 0.00 24.00 5.30 0.02 0.00 24.50 5.30 0.02 0.00 25.00 5.30 0.02 0.00 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 45HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 1Dis: Pre- Dev Peak Discharge Inflow Area = 1.553 ac, 0.00% Impervious, Inflow Depth = 0.02" for 10-Year event Inflow = 0.00 cfs @ 22.06 hrs, Volume= 0.002 af Outflow = 0.00 cfs @ 22.06 hrs, Volume= 0.002 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 1Dis: Pre- Dev Peak Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.004 0.004 0.004 0.004 0.004 0.003 0.003 0.003 0.003 0.003 0.002 0.002 0.002 0.002 0.002 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0 Inflow Area=1.553 ac 0.00 cfs 0.00 cfs Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 46HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 1Dis: Pre- Dev Peak Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.00 0.00 13.00 0.00 0.00 13.50 0.00 0.00 14.00 0.00 0.00 14.50 0.00 0.00 15.00 0.00 0.00 15.50 0.00 0.00 16.00 0.00 0.00 16.50 0.00 0.00 17.00 0.00 0.00 17.50 0.00 0.00 18.00 0.00 0.00 18.50 0.00 0.00 19.00 0.00 0.00 19.50 0.00 0.00 20.00 0.00 0.00 20.50 0.00 0.00 21.00 0.00 0.00 21.50 0.00 0.00 22.00 0.00 0.00 22.50 0.00 0.00 23.00 0.00 0.00 23.50 0.00 0.00 24.00 0.00 0.00 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 47HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 4R: POST DEVELOPMENT PEAK DISCHARGE Inflow Area = 1.544 ac, 0.00% Impervious, Inflow Depth = 0.01" for 10-Year event Inflow = 0.00 cfs @ 22.06 hrs, Volume= 0.002 af Outflow = 0.00 cfs @ 22.06 hrs, Volume= 0.002 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 4R: POST DEVELOPMENT PEAK DISCHARGE Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.004 0.003 0.003 0.003 0.003 0.003 0.002 0.002 0.002 0.002 0.002 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0 Inflow Area=1.544 ac 0.00 cfs 0.00 cfs Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 48HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: POST DEVELOPMENT PEAK DISCHARGE Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.00 0.00 13.00 0.00 0.00 13.50 0.00 0.00 14.00 0.00 0.00 14.50 0.00 0.00 15.00 0.00 0.00 15.50 0.00 0.00 16.00 0.00 0.00 16.50 0.00 0.00 17.00 0.00 0.00 17.50 0.00 0.00 18.00 0.00 0.00 18.50 0.00 0.00 19.00 0.00 0.00 19.50 0.00 0.00 20.00 0.00 0.00 20.50 0.00 0.00 21.00 0.00 0.00 21.50 0.00 0.00 22.00 0.00 0.00 22.50 0.00 0.00 23.00 0.00 0.00 23.50 0.00 0.00 24.00 0.00 0.00 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 49HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Area = 0.030 ac,100.00% Impervious, Inflow Depth = 5.06" for 10-Year event Inflow = 0.16 cfs @ 12.08 hrs, Volume= 0.013 af Outflow = 0.04 cfs @ 12.43 hrs, Volume= 0.013 af, Atten= 73%, Lag= 21.0 min Discarded = 0.04 cfs @ 12.43 hrs, Volume= 0.013 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 101.99' @ 12.43 hrs Surf.Area= 164 sf Storage= 110 cf Plug-Flow detention time= 13.2 min calculated for 0.013 af (100% of inflow) Center-of-Mass det. time= 13.2 min ( 760.3 - 747.1 ) Volume Invert Avail.Storage Storage Description #1 101.00' 130 cf 8.25'W x 19.90'L x 3.00'H Prismatoid 493 cf Overall - 203 cf Embedded = 290 cf x 45.0% Voids #2 101.00' 203 cf 4.25'W x 7.95'L x 3.00'H Prismatoid x 2 Inside #1 333 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 101.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.04 cfs @ 12.43 hrs HW=101.99' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Discarded Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.030 ac Peak Elev=101.99' Storage=110 cf 0.16 cfs 0.04 cfs Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 50HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Discarded Stage-Discharge Discharge (cfs) 0.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050 El e v a t i o n ( f e e t ) 104 103 102 101 Exfiltration Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Wetted Storage Stage-Area-Storage Storage (cubic-feet) 300250200150100500 Surface/Horizontal/Wetted Area (sq-ft) 300250200150100500 El e v a t i o n ( f e e t ) 104 103 102 101 Prismatoid + Prismatoid Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 51HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 0.00 0.00 0 101.00 0.00 0.50 0.00 0 101.00 0.00 1.00 0.00 0 101.00 0.00 1.50 0.00 0 101.00 0.00 2.00 0.00 0 101.00 0.00 2.50 0.00 0 101.00 0.00 3.00 0.00 0 101.00 0.00 3.50 0.00 0 101.00 0.00 4.00 0.00 0 101.00 0.00 4.50 0.00 0 101.00 0.00 5.00 0.00 0 101.00 0.00 5.50 0.00 0 101.00 0.00 6.00 0.00 0 101.00 0.00 6.50 0.00 0 101.00 0.00 7.00 0.00 0 101.00 0.00 7.50 0.00 0 101.00 0.00 8.00 0.00 0 101.00 0.00 8.50 0.00 0 101.00 0.00 9.00 0.01 0 101.00 0.01 9.50 0.01 0 101.00 0.01 10.00 0.01 0 101.00 0.01 10.50 0.01 0 101.00 0.01 11.00 0.01 0 101.00 0.01 11.50 0.02 1 101.01 0.02 12.00 0.10 28 101.25 0.03 12.50 0.03 109 101.98 0.04 13.00 0.01 70 101.63 0.04 13.50 0.01 25 101.23 0.03 14.00 0.01 0 101.00 0.01 14.50 0.01 0 101.00 0.01 15.00 0.01 0 101.00 0.01 15.50 0.01 0 101.00 0.01 16.00 0.00 0 101.00 0.00 16.50 0.00 0 101.00 0.00 17.00 0.00 0 101.00 0.00 17.50 0.00 0 101.00 0.00 18.00 0.00 0 101.00 0.00 18.50 0.00 0 101.00 0.00 19.00 0.00 0 101.00 0.00 19.50 0.00 0 101.00 0.00 20.00 0.00 0 101.00 0.00 20.50 0.00 0 101.00 0.00 21.00 0.00 0 101.00 0.00 21.50 0.00 0 101.00 0.00 22.00 0.00 0 101.00 0.00 22.50 0.00 0 101.00 0.00 23.00 0.00 0 101.00 0.00 23.50 0.00 0 101.00 0.00 24.00 0.00 0 101.00 0.00 24.50 0.00 0 101.00 0.00 25.00 0.00 0 101.00 0.00 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 52HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Discarded (cfs) 101.00 0.00 101.02 0.03 101.04 0.03 101.06 0.03 101.08 0.03 101.10 0.03 101.12 0.03 101.14 0.03 101.16 0.03 101.18 0.03 101.20 0.03 101.22 0.03 101.24 0.03 101.26 0.03 101.28 0.03 101.30 0.03 101.32 0.03 101.34 0.04 101.36 0.04 101.38 0.04 101.40 0.04 101.42 0.04 101.44 0.04 101.46 0.04 101.48 0.04 101.50 0.04 101.52 0.04 101.54 0.04 101.56 0.04 101.58 0.04 101.60 0.04 101.62 0.04 101.64 0.04 101.66 0.04 101.68 0.04 101.70 0.04 101.72 0.04 101.74 0.04 101.76 0.04 101.78 0.04 101.80 0.04 101.82 0.04 101.84 0.04 101.86 0.04 101.88 0.04 101.90 0.04 101.92 0.04 101.94 0.04 101.96 0.04 101.98 0.04 102.00 0.04 102.02 0.04 Elevation (feet) Discarded (cfs) 102.04 0.04 102.06 0.04 102.08 0.04 102.10 0.04 102.12 0.04 102.14 0.04 102.16 0.04 102.18 0.04 102.20 0.04 102.22 0.04 102.24 0.04 102.26 0.05 102.28 0.05 102.30 0.05 102.32 0.05 102.34 0.05 102.36 0.05 102.38 0.05 102.40 0.05 102.42 0.05 102.44 0.05 102.46 0.05 102.48 0.05 102.50 0.05 102.52 0.05 102.54 0.05 102.56 0.05 102.58 0.05 102.60 0.05 102.62 0.05 102.64 0.05 102.66 0.05 102.68 0.05 102.70 0.05 102.72 0.05 102.74 0.05 102.76 0.05 102.78 0.05 102.80 0.05 102.82 0.05 102.84 0.05 102.86 0.05 102.88 0.05 102.90 0.05 102.92 0.05 102.94 0.05 102.96 0.05 102.98 0.05 103.00 0.05 103.02 0.05 103.04 0.05 103.06 0.05 Elevation (feet) Discarded (cfs) 103.08 0.05 103.10 0.05 103.12 0.05 103.14 0.05 103.16 0.05 103.18 0.05 103.20 0.06 103.22 0.06 103.24 0.06 103.26 0.06 103.28 0.06 103.30 0.06 103.32 0.06 103.34 0.06 103.36 0.06 103.38 0.06 103.40 0.06 103.42 0.06 103.44 0.06 103.46 0.06 103.48 0.06 103.50 0.06 103.52 0.06 103.54 0.06 103.56 0.06 103.58 0.06 103.60 0.06 103.62 0.06 103.64 0.06 103.66 0.06 103.68 0.06 103.70 0.06 103.72 0.06 103.74 0.06 103.76 0.06 103.78 0.06 103.80 0.06 103.82 0.06 103.84 0.06 103.86 0.06 103.88 0.06 103.90 0.06 103.92 0.06 103.94 0.06 103.96 0.06 103.98 0.06 104.00 0.06 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 53HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 101.00 164 0 101.05 167 6 101.10 170 11 101.15 173 17 101.20 175 22 101.25 178 28 101.30 181 33 101.35 184 39 101.40 187 44 101.45 190 50 101.50 192 56 101.55 195 61 101.60 198 67 101.65 201 72 101.70 204 78 101.75 206 83 101.80 209 89 101.85 212 94 101.90 215 100 101.95 218 105 102.00 220 111 102.05 223 117 102.10 226 122 102.15 229 128 102.20 232 133 102.25 235 139 102.30 237 144 102.35 240 150 102.40 243 155 102.45 246 161 102.50 249 167 102.55 251 172 102.60 254 178 102.65 257 183 102.70 260 189 102.75 263 194 102.80 266 200 102.85 268 205 102.90 271 211 102.95 274 217 103.00 277 222 103.05 280 228 103.10 282 233 103.15 285 239 103.20 288 244 103.25 291 250 103.30 294 255 103.35 296 261 103.40 299 267 103.45 302 272 103.50 305 278 103.55 308 283 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 103.60 311 289 103.65 313 294 103.70 316 300 103.75 319 305 103.80 322 311 103.85 325 316 103.90 327 322 103.95 330 328 104.00 333 333 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 54HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Inflow Area = 0.240 ac, 0.00% Impervious, Inflow Depth = 1.34" for 10-Year event Inflow = 0.33 cfs @ 12.10 hrs, Volume= 0.027 af Outflow = 0.10 cfs @ 12.51 hrs, Volume= 0.027 af, Atten= 70%, Lag= 24.9 min Discarded = 0.10 cfs @ 12.51 hrs, Volume= 0.027 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach 4R : POST DEVELOPMENT PEAK DISCHARGE Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 95.89' @ 12.51 hrs Surf.Area= 432 sf Storage= 214 cf Plug-Flow detention time= 12.0 min calculated for 0.027 af (100% of inflow) Center-of-Mass det. time= 12.0 min ( 889.2 - 877.3 ) Volume Invert Avail.Storage Storage Description #1 95.00' 937 cf 12.00'W x 36.00'L x 6.00'H Prismatoid 2,592 cf Overall - 509 cf Embedded = 2,083 cf x 45.0% Voids #2 95.00' 509 cf 6.00'D x 6.00'H Vertical Cone/Cylinder x 3 Inside #1 1,446 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 95.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 100.80'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.10 cfs @ 12.51 hrs HW=95.89' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.10 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=95.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 55HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.240 ac Peak Elev=95.89' Storage=214 cf 0.33 cfs 0.10 cfs 0.10 cfs 0.00 cfs Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 101 100 99 98 97 96 95 Exfiltration Broad-Crested Rectangular Weir Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 56HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Wetted Storage Stage-Area-Storage Storage (cubic-feet) 1,4001,2001,0008006004002000 Surface/Horizontal/Wetted Area (sq-ft) 1,0009008007006005004003002001000 El e v a t i o n ( f e e t ) 101 100 99 98 97 96 95 Prismatoid + Vertical Cone/Cylinder Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 57HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 95.00 0.00 0.00 0.00 0.50 0.00 0 95.00 0.00 0.00 0.00 1.00 0.00 0 95.00 0.00 0.00 0.00 1.50 0.00 0 95.00 0.00 0.00 0.00 2.00 0.00 0 95.00 0.00 0.00 0.00 2.50 0.00 0 95.00 0.00 0.00 0.00 3.00 0.00 0 95.00 0.00 0.00 0.00 3.50 0.00 0 95.00 0.00 0.00 0.00 4.00 0.00 0 95.00 0.00 0.00 0.00 4.50 0.00 0 95.00 0.00 0.00 0.00 5.00 0.00 0 95.00 0.00 0.00 0.00 5.50 0.00 0 95.00 0.00 0.00 0.00 6.00 0.00 0 95.00 0.00 0.00 0.00 6.50 0.00 0 95.00 0.00 0.00 0.00 7.00 0.00 0 95.00 0.00 0.00 0.00 7.50 0.00 0 95.00 0.00 0.00 0.00 8.00 0.00 0 95.00 0.00 0.00 0.00 8.50 0.00 0 95.00 0.00 0.00 0.00 9.00 0.00 0 95.00 0.00 0.00 0.00 9.50 0.00 0 95.00 0.00 0.00 0.00 10.00 0.00 0 95.00 0.00 0.00 0.00 10.50 0.00 0 95.00 0.00 0.00 0.00 11.00 0.00 0 95.00 0.00 0.00 0.00 11.50 0.00 0 95.00 0.00 0.00 0.00 12.00 0.15 9 95.04 0.08 0.08 0.00 12.50 0.11 214 95.89 0.10 0.10 0.00 13.00 0.05 151 95.63 0.09 0.09 0.00 13.50 0.04 61 95.25 0.09 0.09 0.00 14.00 0.03 1 95.00 0.03 0.03 0.00 14.50 0.03 1 95.00 0.03 0.03 0.00 15.00 0.03 1 95.00 0.03 0.03 0.00 15.50 0.02 1 95.00 0.02 0.02 0.00 16.00 0.02 1 95.00 0.02 0.02 0.00 16.50 0.02 0 95.00 0.02 0.02 0.00 17.00 0.01 0 95.00 0.01 0.01 0.00 17.50 0.01 0 95.00 0.01 0.01 0.00 18.00 0.01 0 95.00 0.01 0.01 0.00 18.50 0.01 0 95.00 0.01 0.01 0.00 19.00 0.01 0 95.00 0.01 0.01 0.00 19.50 0.01 0 95.00 0.01 0.01 0.00 20.00 0.01 0 95.00 0.01 0.01 0.00 20.50 0.01 0 95.00 0.01 0.01 0.00 21.00 0.01 0 95.00 0.01 0.01 0.00 21.50 0.01 0 95.00 0.01 0.01 0.00 22.00 0.01 0 95.00 0.01 0.01 0.00 22.50 0.01 0 95.00 0.01 0.01 0.00 23.00 0.01 0 95.00 0.01 0.01 0.00 23.50 0.01 0 95.00 0.01 0.01 0.00 24.00 0.01 0 95.00 0.01 0.01 0.00 24.50 0.00 0 95.00 0.00 0.00 0.00 25.00 0.00 0 95.00 0.00 0.00 0.00 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 58HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 95.00 0.00 0.00 0.00 95.10 0.08 0.08 0.00 95.20 0.09 0.09 0.00 95.30 0.09 0.09 0.00 95.40 0.09 0.09 0.00 95.50 0.09 0.09 0.00 95.60 0.09 0.09 0.00 95.70 0.10 0.10 0.00 95.80 0.10 0.10 0.00 95.90 0.10 0.10 0.00 96.00 0.10 0.10 0.00 96.10 0.10 0.10 0.00 96.20 0.10 0.10 0.00 96.30 0.11 0.11 0.00 96.40 0.11 0.11 0.00 96.50 0.11 0.11 0.00 96.60 0.11 0.11 0.00 96.70 0.11 0.11 0.00 96.80 0.12 0.12 0.00 96.90 0.12 0.12 0.00 97.00 0.12 0.12 0.00 97.10 0.12 0.12 0.00 97.20 0.12 0.12 0.00 97.30 0.12 0.12 0.00 97.40 0.13 0.13 0.00 97.50 0.13 0.13 0.00 97.60 0.13 0.13 0.00 97.70 0.13 0.13 0.00 97.80 0.13 0.13 0.00 97.90 0.14 0.14 0.00 98.00 0.14 0.14 0.00 98.10 0.14 0.14 0.00 98.20 0.14 0.14 0.00 98.30 0.14 0.14 0.00 98.40 0.15 0.15 0.00 98.50 0.15 0.15 0.00 98.60 0.15 0.15 0.00 98.70 0.15 0.15 0.00 98.80 0.15 0.15 0.00 98.90 0.15 0.15 0.00 99.00 0.16 0.16 0.00 99.10 0.16 0.16 0.00 99.20 0.16 0.16 0.00 99.30 0.16 0.16 0.00 99.40 0.16 0.16 0.00 99.50 0.17 0.17 0.00 99.60 0.17 0.17 0.00 99.70 0.17 0.17 0.00 99.80 0.17 0.17 0.00 99.90 0.17 0.17 0.00 100.00 0.17 0.17 0.00 100.10 0.18 0.18 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 100.20 0.18 0.18 0.00 100.30 0.18 0.18 0.00 100.40 0.18 0.18 0.00 100.50 0.18 0.18 0.00 100.60 0.19 0.19 0.00 100.70 0.19 0.19 0.00 100.80 0.19 0.19 0.00 100.90 1.18 0.19 0.99 101.00 2.98 0.19 2.79 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 59HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 95.00 432 0 95.10 442 24 95.20 451 48 95.30 461 72 95.40 470 96 95.50 480 121 95.60 490 145 95.70 499 169 95.80 509 193 95.90 518 217 96.00 528 241 96.10 538 265 96.20 547 289 96.30 557 313 96.40 566 337 96.50 576 362 96.60 586 386 96.70 595 410 96.80 605 434 96.90 614 458 97.00 624 482 97.10 634 506 97.20 643 530 97.30 653 554 97.40 662 579 97.50 672 603 97.60 682 627 97.70 691 651 97.80 701 675 97.90 710 699 98.00 720 723 98.10 730 747 98.20 739 771 98.30 749 795 98.40 758 820 98.50 768 844 98.60 778 868 98.70 787 892 98.80 797 916 98.90 806 940 99.00 816 964 99.10 826 988 99.20 835 1,012 99.30 845 1,037 99.40 854 1,061 99.50 864 1,085 99.60 874 1,109 99.70 883 1,133 99.80 893 1,157 99.90 902 1,181 100.00 912 1,205 100.10 922 1,229 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 100.20 931 1,253 100.30 941 1,278 100.40 950 1,302 100.50 960 1,326 100.60 970 1,350 100.70 979 1,374 100.80 989 1,398 100.90 998 1,422 101.00 1,008 1,446 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 60HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB1: Roof Leader - 6" ADS Pipe Inflow Area = 0.030 ac,100.00% Impervious, Inflow Depth = 5.06" for 10-Year event Inflow = 0.16 cfs @ 12.08 hrs, Volume= 0.013 af Outflow = 0.16 cfs @ 12.08 hrs, Volume= 0.013 af, Atten= 0%, Lag= 0.0 min Primary = 0.16 cfs @ 12.08 hrs, Volume= 0.013 af Routed to Pond 1P : One (1) 19.9' x 8.25' x 3' Leach Chamber System Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 105.13' @ 12.08 hrs Device Routing Invert Outlet Devices #1 Primary 105.00'6.0" Round Culvert X 4.00 L= 50.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 105.00' / 104.00' S= 0.0200 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.20 sf Primary OutFlow Max=0.16 cfs @ 12.08 hrs HW=105.13' TW=101.52' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.16 cfs @ 0.97 fps) Pond CB1: Roof Leader - 6" ADS Pipe Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.030 ac Peak Elev=105.13' 6.0" Round Culvert x 4.00 n=0.020 L=50.0' S=0.0200 '/' 0.16 cfs 0.16 cfs Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 61HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB1: Roof Leader - 6" ADS Pipe Primary Stage-Discharge Discharge (cfs) 10 El e v a t i o n ( f e e t ) 105.5 105.48 105.46 105.44 105.42 105.4 105.38 105.36 105.34 105.32 105.3 105.28 105.26 105.24 105.22 105.2 105.18 105.16 105.14 105.12 105.1 105.08 105.06 105.04 105.02 105 Culvert Pond CB1: Roof Leader - 6" ADS Pipe Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 105.5 105.48 105.46 105.44 105.42 105.4 105.38 105.36 105.34 105.32 105.3 105.28 105.26 105.24 105.22 105.2 105.18 105.16 105.14 105.12 105.1 105.08 105.06 105.04 105.02 105 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 62HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB1: Roof Leader - 6" ADS Pipe Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 105.00 0.00 0.50 0.00 105.00 0.00 1.00 0.00 105.00 0.00 1.50 0.00 105.01 0.00 2.00 0.00 105.01 0.00 2.50 0.00 105.01 0.00 3.00 0.00 105.01 0.00 3.50 0.00 105.01 0.00 4.00 0.00 105.01 0.00 4.50 0.00 105.01 0.00 5.00 0.00 105.02 0.00 5.50 0.00 105.02 0.00 6.00 0.00 105.02 0.00 6.50 0.00 105.02 0.00 7.00 0.00 105.02 0.00 7.50 0.00 105.02 0.00 8.00 0.00 105.02 0.00 8.50 0.00 105.02 0.00 9.00 0.01 105.03 0.01 9.50 0.01 105.03 0.01 10.00 0.01 105.03 0.01 10.50 0.01 105.03 0.01 11.00 0.01 105.04 0.01 11.50 0.02 105.04 0.02 12.00 0.10 105.10 0.10 12.50 0.03 105.06 0.03 13.00 0.01 105.04 0.01 13.50 0.01 105.03 0.01 14.00 0.01 105.03 0.01 14.50 0.01 105.03 0.01 15.00 0.01 105.03 0.01 15.50 0.01 105.02 0.01 16.00 0.00 105.02 0.00 16.50 0.00 105.02 0.00 17.00 0.00 105.02 0.00 17.50 0.00 105.02 0.00 18.00 0.00 105.02 0.00 18.50 0.00 105.02 0.00 19.00 0.00 105.02 0.00 19.50 0.00 105.02 0.00 20.00 0.00 105.02 0.00 20.50 0.00 105.02 0.00 21.00 0.00 105.02 0.00 21.50 0.00 105.02 0.00 22.00 0.00 105.01 0.00 22.50 0.00 105.01 0.00 23.00 0.00 105.01 0.00 23.50 0.00 105.01 0.00 24.00 0.00 105.01 0.00 24.50 0.00 105.00 0.00 25.00 0.00 105.00 0.00 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 63HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB1: Roof Leader - 6" ADS Pipe Elevation (feet) Primary (cfs) 105.00 0.00 105.01 0.00 105.02 0.00 105.03 0.01 105.04 0.01 105.05 0.02 105.06 0.03 105.07 0.05 105.08 0.06 105.09 0.08 105.10 0.10 105.11 0.11 105.12 0.13 105.13 0.16 105.14 0.18 105.15 0.21 105.16 0.23 105.17 0.26 105.18 0.29 105.19 0.32 105.20 0.35 105.21 0.39 105.22 0.42 105.23 0.45 105.24 0.49 105.25 0.53 105.26 0.57 105.27 0.60 105.28 0.64 105.29 0.68 105.30 0.72 105.31 0.77 105.32 0.81 105.33 0.85 105.34 0.89 105.35 0.93 105.36 0.98 105.37 1.02 105.38 1.06 105.39 1.10 105.40 1.15 105.41 1.19 105.42 1.23 105.43 1.27 105.44 1.31 105.45 1.34 105.46 1.38 105.47 1.41 105.48 1.44 105.49 1.47 105.50 1.49 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 64HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB1: Roof Leader - 6" ADS Pipe Elevation (feet) Storage (acre-feet) 105.00 0.000 105.01 0.000 105.02 0.000 105.03 0.000 105.04 0.000 105.05 0.000 105.06 0.000 105.07 0.000 105.08 0.000 105.09 0.000 105.10 0.000 105.11 0.000 105.12 0.000 105.13 0.000 105.14 0.000 105.15 0.000 105.16 0.000 105.17 0.000 105.18 0.000 105.19 0.000 105.20 0.000 105.21 0.000 105.22 0.000 105.23 0.000 105.24 0.000 105.25 0.000 105.26 0.000 105.27 0.000 105.28 0.000 105.29 0.000 105.30 0.000 105.31 0.000 105.32 0.000 105.33 0.000 105.34 0.000 105.35 0.000 105.36 0.000 105.37 0.000 105.38 0.000 105.39 0.000 105.40 0.000 105.41 0.000 105.42 0.000 105.43 0.000 105.44 0.000 105.45 0.000 105.46 0.000 105.47 0.000 105.48 0.000 105.49 0.000 105.50 0.000 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 65HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB2: Catch Basin At Lower Driveway Inflow Area = 0.240 ac, 0.00% Impervious, Inflow Depth = 1.34" for 10-Year event Inflow = 0.33 cfs @ 12.10 hrs, Volume= 0.027 af Outflow = 0.33 cfs @ 12.10 hrs, Volume= 0.027 af, Atten= 0%, Lag= 0.0 min Primary = 0.33 cfs @ 12.10 hrs, Volume= 0.027 af Routed to Pond 2P : One (1) 36.0' x 12.0' x 6' Leach Chamber System Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 105.72' @ 12.10 hrs Device Routing Invert Outlet Devices #1 Primary 105.50'12.0" Round Catch Basin X 2.00 L= 50.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 105.50' / 102.50' S= 0.0600 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.79 sf Primary OutFlow Max=0.33 cfs @ 12.10 hrs HW=105.72' TW=95.30' (Dynamic Tailwater) 1=Catch Basin (Inlet Controls 0.33 cfs @ 1.27 fps) Pond CB2: Catch Basin At Lower Driveway Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.240 ac Peak Elev=105.72' 12.0" Round Culvert x 2.00 n=0.020 L=50.0' S=0.0600 '/' 0.33 cfs 0.33 cfs Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 66HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB2: Catch Basin At Lower Driveway Primary Stage-Discharge Discharge (cfs) 43210 El e v a t i o n ( f e e t ) 106 Catch Basin Pond CB2: Catch Basin At Lower Driveway Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 106 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 67HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB2: Catch Basin At Lower Driveway Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 105.50 0.00 0.50 0.00 105.50 0.00 1.00 0.00 105.50 0.00 1.50 0.00 105.50 0.00 2.00 0.00 105.50 0.00 2.50 0.00 105.50 0.00 3.00 0.00 105.50 0.00 3.50 0.00 105.50 0.00 4.00 0.00 105.50 0.00 4.50 0.00 105.50 0.00 5.00 0.00 105.50 0.00 5.50 0.00 105.50 0.00 6.00 0.00 105.50 0.00 6.50 0.00 105.50 0.00 7.00 0.00 105.50 0.00 7.50 0.00 105.50 0.00 8.00 0.00 105.50 0.00 8.50 0.00 105.50 0.00 9.00 0.00 105.50 0.00 9.50 0.00 105.50 0.00 10.00 0.00 105.50 0.00 10.50 0.00 105.50 0.00 11.00 0.00 105.50 0.00 11.50 0.00 105.52 0.00 12.00 0.15 105.65 0.15 12.50 0.11 105.62 0.11 13.00 0.05 105.58 0.05 13.50 0.04 105.57 0.04 14.00 0.03 105.57 0.03 14.50 0.03 105.56 0.03 15.00 0.03 105.56 0.03 15.50 0.02 105.56 0.02 16.00 0.02 105.55 0.02 16.50 0.02 105.55 0.02 17.00 0.01 105.55 0.01 17.50 0.01 105.54 0.01 18.00 0.01 105.54 0.01 18.50 0.01 105.54 0.01 19.00 0.01 105.54 0.01 19.50 0.01 105.54 0.01 20.00 0.01 105.54 0.01 20.50 0.01 105.54 0.01 21.00 0.01 105.53 0.01 21.50 0.01 105.53 0.01 22.00 0.01 105.53 0.01 22.50 0.01 105.53 0.01 23.00 0.01 105.53 0.01 23.50 0.01 105.53 0.01 24.00 0.01 105.53 0.01 24.50 0.00 105.50 0.00 25.00 0.00 105.50 0.00 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 68HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB2: Catch Basin At Lower Driveway Elevation (feet) Primary (cfs) 105.50 0.00 105.51 0.00 105.52 0.00 105.53 0.01 105.54 0.01 105.55 0.02 105.56 0.03 105.57 0.03 105.58 0.04 105.59 0.06 105.60 0.07 105.61 0.08 105.62 0.10 105.63 0.12 105.64 0.13 105.65 0.15 105.66 0.17 105.67 0.20 105.68 0.22 105.69 0.24 105.70 0.27 105.71 0.30 105.72 0.32 105.73 0.35 105.74 0.38 105.75 0.41 105.76 0.44 105.77 0.48 105.78 0.51 105.79 0.55 105.80 0.58 105.81 0.62 105.82 0.66 105.83 0.70 105.84 0.74 105.85 0.78 105.86 0.82 105.87 0.86 105.88 0.91 105.89 0.95 105.90 1.00 105.91 1.04 105.92 1.09 105.93 1.14 105.94 1.19 105.95 1.24 105.96 1.29 105.97 1.34 105.98 1.39 105.99 1.44 106.00 1.49 106.01 1.55 Elevation (feet) Primary (cfs) 106.02 1.60 106.03 1.65 106.04 1.71 106.05 1.76 106.06 1.82 106.07 1.88 106.08 1.93 106.09 1.99 106.10 2.05 106.11 2.11 106.12 2.17 106.13 2.22 106.14 2.28 106.15 2.34 106.16 2.40 106.17 2.46 106.18 2.52 106.19 2.58 106.20 2.64 106.21 2.70 106.22 2.76 106.23 2.82 106.24 2.88 106.25 2.94 106.26 3.00 106.27 3.06 106.28 3.12 106.29 3.18 106.30 3.24 106.31 3.30 106.32 3.36 106.33 3.41 106.34 3.47 106.35 3.53 106.36 3.58 106.37 3.64 106.38 3.69 106.39 3.74 106.40 3.80 106.41 3.85 106.42 3.90 106.43 3.95 106.44 3.99 106.45 4.04 106.46 4.08 106.47 4.12 106.48 4.16 106.49 4.19 106.50 4.22 Type III 24-hr 10-Year Rainfall=5.30"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 69HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB2: Catch Basin At Lower Driveway Elevation (feet) Storage (acre-feet) 105.50 0.000 105.51 0.000 105.52 0.000 105.53 0.000 105.54 0.000 105.55 0.000 105.56 0.000 105.57 0.000 105.58 0.000 105.59 0.000 105.60 0.000 105.61 0.000 105.62 0.000 105.63 0.000 105.64 0.000 105.65 0.000 105.66 0.000 105.67 0.000 105.68 0.000 105.69 0.000 105.70 0.000 105.71 0.000 105.72 0.000 105.73 0.000 105.74 0.000 105.75 0.000 105.76 0.000 105.77 0.000 105.78 0.000 105.79 0.000 105.80 0.000 105.81 0.000 105.82 0.000 105.83 0.000 105.84 0.000 105.85 0.000 105.86 0.000 105.87 0.000 105.88 0.000 105.89 0.000 105.90 0.000 105.91 0.000 105.92 0.000 105.93 0.000 105.94 0.000 105.95 0.000 105.96 0.000 105.97 0.000 105.98 0.000 105.99 0.000 106.00 0.000 106.01 0.000 Elevation (feet) Storage (acre-feet) 106.02 0.000 106.03 0.000 106.04 0.000 106.05 0.000 106.06 0.000 106.07 0.000 106.08 0.000 106.09 0.000 106.10 0.000 106.11 0.000 106.12 0.000 106.13 0.000 106.14 0.000 106.15 0.000 106.16 0.000 106.17 0.000 106.18 0.000 106.19 0.000 106.20 0.000 106.21 0.000 106.22 0.000 106.23 0.000 106.24 0.000 106.25 0.000 106.26 0.000 106.27 0.000 106.28 0.000 106.29 0.000 106.30 0.000 106.31 0.000 106.32 0.000 106.33 0.000 106.34 0.000 106.35 0.000 106.36 0.000 106.37 0.000 106.38 0.000 106.39 0.000 106.40 0.000 106.41 0.000 106.42 0.000 106.43 0.000 106.44 0.000 106.45 0.000 106.46 0.000 106.47 0.000 106.48 0.000 106.49 0.000 106.50 0.000 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 70HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1Ex: Existing Parcel Area Runoff = 0.03 cfs @ 14.90 hrs, Volume= 0.017 af, Depth= 0.13" Routed to Reach 1Dis : Pre- Dev Peak Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 25-Year Rainfall=6.50" Area (sf) CN Description 67,651 30 Woods, Good, HSG A 67,651 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1Ex: Existing Parcel Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Type III 24-hr 25-Year Rainfall=6.50" Runoff Area=67,651 sf Runoff Volume=0.017 af Runoff Depth=0.13" Tc=6.0 min CN=30 0.03 cfs Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 71HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1Ex: Existing Parcel Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.07 0.00 0.00 1.50 0.10 0.00 0.00 2.00 0.13 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.20 0.00 0.00 3.50 0.24 0.00 0.00 4.00 0.28 0.00 0.00 4.50 0.32 0.00 0.00 5.00 0.37 0.00 0.00 5.50 0.42 0.00 0.00 6.00 0.47 0.00 0.00 6.50 0.52 0.00 0.00 7.00 0.59 0.00 0.00 7.50 0.66 0.00 0.00 8.00 0.74 0.00 0.00 8.50 0.83 0.00 0.00 9.00 0.95 0.00 0.00 9.50 1.08 0.00 0.00 10.00 1.23 0.00 0.00 10.50 1.41 0.00 0.00 11.00 1.63 0.00 0.00 11.50 1.94 0.00 0.00 12.00 3.25 0.00 0.00 12.50 4.56 0.00 0.00 13.00 4.87 0.00 0.01 13.50 5.09 0.01 0.02 14.00 5.27 0.02 0.02 14.50 5.42 0.02 0.03 15.00 5.55 0.03 0.03 15.50 5.67 0.04 0.03 16.00 5.76 0.05 0.02 16.50 5.84 0.06 0.02 17.00 5.91 0.06 0.02 17.50 5.98 0.07 0.02 18.00 6.03 0.08 0.02 18.50 6.08 0.08 0.02 19.00 6.13 0.09 0.02 19.50 6.18 0.09 0.02 20.00 6.22 0.10 0.02 20.50 6.26 0.10 0.02 21.00 6.30 0.11 0.02 21.50 6.34 0.11 0.01 22.00 6.37 0.12 0.01 22.50 6.41 0.12 0.01 23.00 6.44 0.13 0.01 23.50 6.47 0.13 0.01 24.00 6.50 0.13 0.01 24.50 6.50 0.13 0.00 25.00 6.50 0.13 0.00 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 72HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Half of Roof Runoff Runoff = 0.19 cfs @ 12.08 hrs, Volume= 0.016 af, Depth= 6.26" Routed to Pond CB1 : Roof Leader - 6" ADS Pipe Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 25-Year Rainfall=6.50" Area (sf) CN Description * 1,325 98 Roof Area 1,325 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1S: Half of Roof Runoff Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type III 24-hr 25-Year Rainfall=6.50" Runoff Area=1,325 sf Runoff Volume=0.016 af Runoff Depth=6.26" Tc=6.0 min CN=98 0.19 cfs Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 73HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: Half of Roof Runoff Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.07 0.00 0.00 1.50 0.10 0.01 0.00 2.00 0.13 0.03 0.00 2.50 0.16 0.05 0.00 3.00 0.20 0.07 0.00 3.50 0.24 0.10 0.00 4.00 0.28 0.13 0.00 4.50 0.32 0.16 0.00 5.00 0.37 0.20 0.00 5.50 0.42 0.24 0.00 6.00 0.47 0.29 0.00 6.50 0.52 0.34 0.00 7.00 0.59 0.40 0.00 7.50 0.66 0.47 0.00 8.00 0.74 0.54 0.00 8.50 0.83 0.63 0.01 9.00 0.95 0.74 0.01 9.50 1.08 0.87 0.01 10.00 1.23 1.01 0.01 10.50 1.41 1.19 0.01 11.00 1.63 1.40 0.01 11.50 1.94 1.71 0.02 12.00 3.25 3.02 0.12 12.50 4.56 4.33 0.04 13.00 4.87 4.64 0.02 13.50 5.09 4.86 0.01 14.00 5.27 5.03 0.01 14.50 5.42 5.18 0.01 15.00 5.55 5.32 0.01 15.50 5.67 5.43 0.01 16.00 5.76 5.52 0.01 16.50 5.84 5.60 0.00 17.00 5.91 5.67 0.00 17.50 5.98 5.74 0.00 18.00 6.03 5.79 0.00 18.50 6.08 5.84 0.00 19.00 6.13 5.89 0.00 19.50 6.18 5.94 0.00 20.00 6.22 5.98 0.00 20.50 6.26 6.02 0.00 21.00 6.30 6.06 0.00 21.50 6.34 6.10 0.00 22.00 6.37 6.14 0.00 22.50 6.41 6.17 0.00 23.00 6.44 6.20 0.00 23.50 6.47 6.23 0.00 24.00 6.50 6.26 0.00 24.50 6.50 6.26 0.00 25.00 6.50 6.26 0.00 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 74HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Gravel Driveway & Landscape Aras Runoff = 0.55 cfs @ 12.10 hrs, Volume= 0.042 af, Depth= 2.08" Routed to Pond CB2 : Catch Basin At Lower Driveway Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 25-Year Rainfall=6.50" Area (sf) CN Description 5,465 76 Gravel roads, HSG A 5,000 39 >75% Grass cover, Good, HSG A 10,465 58 Weighted Average 10,465 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 2S: Gravel Driveway & Landscape Aras Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr 25-Year Rainfall=6.50" Runoff Area=10,465 sf Runoff Volume=0.042 af Runoff Depth=2.08" Tc=6.0 min CN=58 0.55 cfs Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 75HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: Gravel Driveway & Landscape Aras Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.07 0.00 0.00 1.50 0.10 0.00 0.00 2.00 0.13 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.20 0.00 0.00 3.50 0.24 0.00 0.00 4.00 0.28 0.00 0.00 4.50 0.32 0.00 0.00 5.00 0.37 0.00 0.00 5.50 0.42 0.00 0.00 6.00 0.47 0.00 0.00 6.50 0.52 0.00 0.00 7.00 0.59 0.00 0.00 7.50 0.66 0.00 0.00 8.00 0.74 0.00 0.00 8.50 0.83 0.00 0.00 9.00 0.95 0.00 0.00 9.50 1.08 0.00 0.00 10.00 1.23 0.00 0.00 10.50 1.41 0.00 0.00 11.00 1.63 0.00 0.00 11.50 1.94 0.03 0.02 12.00 3.25 0.36 0.28 12.50 4.56 0.94 0.16 13.00 4.87 1.10 0.07 13.50 5.09 1.22 0.06 14.00 5.27 1.32 0.05 14.50 5.42 1.41 0.04 15.00 5.55 1.48 0.04 15.50 5.67 1.55 0.03 16.00 5.76 1.61 0.03 16.50 5.84 1.66 0.02 17.00 5.91 1.70 0.02 17.50 5.98 1.74 0.02 18.00 6.03 1.78 0.02 18.50 6.08 1.81 0.02 19.00 6.13 1.84 0.01 19.50 6.18 1.87 0.01 20.00 6.22 1.90 0.01 20.50 6.26 1.92 0.01 21.00 6.30 1.95 0.01 21.50 6.34 1.97 0.01 22.00 6.37 1.99 0.01 22.50 6.41 2.02 0.01 23.00 6.44 2.04 0.01 23.50 6.47 2.06 0.01 24.00 6.50 2.08 0.01 24.50 6.50 2.08 0.00 25.00 6.50 2.08 0.00 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 76HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Undeveloped Areas of Parcel Runoff = 0.02 cfs @ 14.90 hrs, Volume= 0.015 af, Depth= 0.13" Routed to Reach 4R : POST DEVELOPMENT PEAK DISCHARGE Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 25-Year Rainfall=6.50" Area (sf) CN Description 56,801 30 Woods, Good, HSG A 56,801 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 3S: Undeveloped Areas of Parcel Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.025 0.024 0.023 0.022 0.021 0.02 0.019 0.018 0.017 0.016 0.015 0.014 0.013 0.012 0.011 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0 Type III 24-hr 25-Year Rainfall=6.50" Runoff Area=56,801 sf Runoff Volume=0.015 af Runoff Depth=0.13" Tc=6.0 min CN=30 0.02 cfs Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 77HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: Undeveloped Areas of Parcel Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.07 0.00 0.00 1.50 0.10 0.00 0.00 2.00 0.13 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.20 0.00 0.00 3.50 0.24 0.00 0.00 4.00 0.28 0.00 0.00 4.50 0.32 0.00 0.00 5.00 0.37 0.00 0.00 5.50 0.42 0.00 0.00 6.00 0.47 0.00 0.00 6.50 0.52 0.00 0.00 7.00 0.59 0.00 0.00 7.50 0.66 0.00 0.00 8.00 0.74 0.00 0.00 8.50 0.83 0.00 0.00 9.00 0.95 0.00 0.00 9.50 1.08 0.00 0.00 10.00 1.23 0.00 0.00 10.50 1.41 0.00 0.00 11.00 1.63 0.00 0.00 11.50 1.94 0.00 0.00 12.00 3.25 0.00 0.00 12.50 4.56 0.00 0.00 13.00 4.87 0.00 0.01 13.50 5.09 0.01 0.02 14.00 5.27 0.02 0.02 14.50 5.42 0.02 0.02 15.00 5.55 0.03 0.02 15.50 5.67 0.04 0.02 16.00 5.76 0.05 0.02 16.50 5.84 0.06 0.02 17.00 5.91 0.06 0.02 17.50 5.98 0.07 0.02 18.00 6.03 0.08 0.02 18.50 6.08 0.08 0.01 19.00 6.13 0.09 0.01 19.50 6.18 0.09 0.01 20.00 6.22 0.10 0.01 20.50 6.26 0.10 0.01 21.00 6.30 0.11 0.01 21.50 6.34 0.11 0.01 22.00 6.37 0.12 0.01 22.50 6.41 0.12 0.01 23.00 6.44 0.13 0.01 23.50 6.47 0.13 0.01 24.00 6.50 0.13 0.01 24.50 6.50 0.13 0.00 25.00 6.50 0.13 0.00 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 78HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 1Dis: Pre- Dev Peak Discharge Inflow Area = 1.553 ac, 0.00% Impervious, Inflow Depth = 0.13" for 25-Year event Inflow = 0.03 cfs @ 14.90 hrs, Volume= 0.017 af Outflow = 0.03 cfs @ 14.90 hrs, Volume= 0.017 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 1Dis: Pre- Dev Peak Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Inflow Area=1.553 ac 0.03 cfs 0.03 cfs Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 79HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 1Dis: Pre- Dev Peak Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.00 0.00 13.00 0.01 0.01 13.50 0.02 0.02 14.00 0.02 0.02 14.50 0.03 0.03 15.00 0.03 0.03 15.50 0.03 0.03 16.00 0.02 0.02 16.50 0.02 0.02 17.00 0.02 0.02 17.50 0.02 0.02 18.00 0.02 0.02 18.50 0.02 0.02 19.00 0.02 0.02 19.50 0.02 0.02 20.00 0.02 0.02 20.50 0.02 0.02 21.00 0.02 0.02 21.50 0.01 0.01 22.00 0.01 0.01 22.50 0.01 0.01 23.00 0.01 0.01 23.50 0.01 0.01 24.00 0.01 0.01 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 80HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 4R: POST DEVELOPMENT PEAK DISCHARGE Inflow Area = 1.544 ac, 0.00% Impervious, Inflow Depth = 0.11" for 25-Year event Inflow = 0.02 cfs @ 14.90 hrs, Volume= 0.015 af Outflow = 0.02 cfs @ 14.90 hrs, Volume= 0.015 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 4R: POST DEVELOPMENT PEAK DISCHARGE Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Inflow Area=1.544 ac 0.02 cfs 0.02 cfs Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 81HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: POST DEVELOPMENT PEAK DISCHARGE Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.00 0.00 13.00 0.01 0.01 13.50 0.02 0.02 14.00 0.02 0.02 14.50 0.02 0.02 15.00 0.02 0.02 15.50 0.02 0.02 16.00 0.02 0.02 16.50 0.02 0.02 17.00 0.02 0.02 17.50 0.02 0.02 18.00 0.02 0.02 18.50 0.01 0.01 19.00 0.01 0.01 19.50 0.01 0.01 20.00 0.01 0.01 20.50 0.01 0.01 21.00 0.01 0.01 21.50 0.01 0.01 22.00 0.01 0.01 22.50 0.01 0.01 23.00 0.01 0.01 23.50 0.01 0.01 24.00 0.01 0.01 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 82HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Area = 0.030 ac,100.00% Impervious, Inflow Depth = 6.26" for 25-Year event Inflow = 0.19 cfs @ 12.08 hrs, Volume= 0.016 af Outflow = 0.05 cfs @ 12.46 hrs, Volume= 0.016 af, Atten= 76%, Lag= 22.8 min Discarded = 0.05 cfs @ 12.46 hrs, Volume= 0.016 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 102.38' @ 12.46 hrs Surf.Area= 164 sf Storage= 153 cf Plug-Flow detention time= 18.0 min calculated for 0.016 af (100% of inflow) Center-of-Mass det. time= 18.0 min ( 761.9 - 744.0 ) Volume Invert Avail.Storage Storage Description #1 101.00' 130 cf 8.25'W x 19.90'L x 3.00'H Prismatoid 493 cf Overall - 203 cf Embedded = 290 cf x 45.0% Voids #2 101.00' 203 cf 4.25'W x 7.95'L x 3.00'H Prismatoid x 2 Inside #1 333 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 101.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.05 cfs @ 12.46 hrs HW=102.38' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.05 cfs) Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Discarded Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.030 ac Peak Elev=102.38' Storage=153 cf 0.19 cfs 0.05 cfs Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 83HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Discarded Stage-Discharge Discharge (cfs) 0.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050 El e v a t i o n ( f e e t ) 104 103 102 101 Exfiltration Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Wetted Storage Stage-Area-Storage Storage (cubic-feet) 300250200150100500 Surface/Horizontal/Wetted Area (sq-ft) 300250200150100500 El e v a t i o n ( f e e t ) 104 103 102 101 Prismatoid + Prismatoid Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 84HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 0.00 0.00 0 101.00 0.00 0.50 0.00 0 101.00 0.00 1.00 0.00 0 101.00 0.00 1.50 0.00 0 101.00 0.00 2.00 0.00 0 101.00 0.00 2.50 0.00 0 101.00 0.00 3.00 0.00 0 101.00 0.00 3.50 0.00 0 101.00 0.00 4.00 0.00 0 101.00 0.00 4.50 0.00 0 101.00 0.00 5.00 0.00 0 101.00 0.00 5.50 0.00 0 101.00 0.00 6.00 0.00 0 101.00 0.00 6.50 0.00 0 101.00 0.00 7.00 0.00 0 101.00 0.00 7.50 0.00 0 101.00 0.00 8.00 0.00 0 101.00 0.00 8.50 0.01 0 101.00 0.01 9.00 0.01 0 101.00 0.01 9.50 0.01 0 101.00 0.01 10.00 0.01 0 101.00 0.01 10.50 0.01 0 101.00 0.01 11.00 0.01 0 101.00 0.01 11.50 0.02 1 101.01 0.02 12.00 0.12 43 101.39 0.04 12.50 0.04 153 102.38 0.05 13.00 0.02 113 102.02 0.04 13.50 0.01 66 101.59 0.04 14.00 0.01 22 101.20 0.03 14.50 0.01 0 101.00 0.01 15.00 0.01 0 101.00 0.01 15.50 0.01 0 101.00 0.01 16.00 0.01 0 101.00 0.01 16.50 0.00 0 101.00 0.00 17.00 0.00 0 101.00 0.00 17.50 0.00 0 101.00 0.00 18.00 0.00 0 101.00 0.00 18.50 0.00 0 101.00 0.00 19.00 0.00 0 101.00 0.00 19.50 0.00 0 101.00 0.00 20.00 0.00 0 101.00 0.00 20.50 0.00 0 101.00 0.00 21.00 0.00 0 101.00 0.00 21.50 0.00 0 101.00 0.00 22.00 0.00 0 101.00 0.00 22.50 0.00 0 101.00 0.00 23.00 0.00 0 101.00 0.00 23.50 0.00 0 101.00 0.00 24.00 0.00 0 101.00 0.00 24.50 0.00 0 101.00 0.00 25.00 0.00 0 101.00 0.00 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 85HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Discarded (cfs) 101.00 0.00 101.02 0.03 101.04 0.03 101.06 0.03 101.08 0.03 101.10 0.03 101.12 0.03 101.14 0.03 101.16 0.03 101.18 0.03 101.20 0.03 101.22 0.03 101.24 0.03 101.26 0.03 101.28 0.03 101.30 0.03 101.32 0.03 101.34 0.04 101.36 0.04 101.38 0.04 101.40 0.04 101.42 0.04 101.44 0.04 101.46 0.04 101.48 0.04 101.50 0.04 101.52 0.04 101.54 0.04 101.56 0.04 101.58 0.04 101.60 0.04 101.62 0.04 101.64 0.04 101.66 0.04 101.68 0.04 101.70 0.04 101.72 0.04 101.74 0.04 101.76 0.04 101.78 0.04 101.80 0.04 101.82 0.04 101.84 0.04 101.86 0.04 101.88 0.04 101.90 0.04 101.92 0.04 101.94 0.04 101.96 0.04 101.98 0.04 102.00 0.04 102.02 0.04 Elevation (feet) Discarded (cfs) 102.04 0.04 102.06 0.04 102.08 0.04 102.10 0.04 102.12 0.04 102.14 0.04 102.16 0.04 102.18 0.04 102.20 0.04 102.22 0.04 102.24 0.04 102.26 0.05 102.28 0.05 102.30 0.05 102.32 0.05 102.34 0.05 102.36 0.05 102.38 0.05 102.40 0.05 102.42 0.05 102.44 0.05 102.46 0.05 102.48 0.05 102.50 0.05 102.52 0.05 102.54 0.05 102.56 0.05 102.58 0.05 102.60 0.05 102.62 0.05 102.64 0.05 102.66 0.05 102.68 0.05 102.70 0.05 102.72 0.05 102.74 0.05 102.76 0.05 102.78 0.05 102.80 0.05 102.82 0.05 102.84 0.05 102.86 0.05 102.88 0.05 102.90 0.05 102.92 0.05 102.94 0.05 102.96 0.05 102.98 0.05 103.00 0.05 103.02 0.05 103.04 0.05 103.06 0.05 Elevation (feet) Discarded (cfs) 103.08 0.05 103.10 0.05 103.12 0.05 103.14 0.05 103.16 0.05 103.18 0.05 103.20 0.06 103.22 0.06 103.24 0.06 103.26 0.06 103.28 0.06 103.30 0.06 103.32 0.06 103.34 0.06 103.36 0.06 103.38 0.06 103.40 0.06 103.42 0.06 103.44 0.06 103.46 0.06 103.48 0.06 103.50 0.06 103.52 0.06 103.54 0.06 103.56 0.06 103.58 0.06 103.60 0.06 103.62 0.06 103.64 0.06 103.66 0.06 103.68 0.06 103.70 0.06 103.72 0.06 103.74 0.06 103.76 0.06 103.78 0.06 103.80 0.06 103.82 0.06 103.84 0.06 103.86 0.06 103.88 0.06 103.90 0.06 103.92 0.06 103.94 0.06 103.96 0.06 103.98 0.06 104.00 0.06 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 86HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 101.00 164 0 101.05 167 6 101.10 170 11 101.15 173 17 101.20 175 22 101.25 178 28 101.30 181 33 101.35 184 39 101.40 187 44 101.45 190 50 101.50 192 56 101.55 195 61 101.60 198 67 101.65 201 72 101.70 204 78 101.75 206 83 101.80 209 89 101.85 212 94 101.90 215 100 101.95 218 105 102.00 220 111 102.05 223 117 102.10 226 122 102.15 229 128 102.20 232 133 102.25 235 139 102.30 237 144 102.35 240 150 102.40 243 155 102.45 246 161 102.50 249 167 102.55 251 172 102.60 254 178 102.65 257 183 102.70 260 189 102.75 263 194 102.80 266 200 102.85 268 205 102.90 271 211 102.95 274 217 103.00 277 222 103.05 280 228 103.10 282 233 103.15 285 239 103.20 288 244 103.25 291 250 103.30 294 255 103.35 296 261 103.40 299 267 103.45 302 272 103.50 305 278 103.55 308 283 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 103.60 311 289 103.65 313 294 103.70 316 300 103.75 319 305 103.80 322 311 103.85 325 316 103.90 327 322 103.95 330 328 104.00 333 333 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 87HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Inflow Area = 0.240 ac, 0.00% Impervious, Inflow Depth = 2.08" for 25-Year event Inflow = 0.55 cfs @ 12.10 hrs, Volume= 0.042 af Outflow = 0.12 cfs @ 12.56 hrs, Volume= 0.042 af, Atten= 79%, Lag= 28.1 min Discarded = 0.12 cfs @ 12.56 hrs, Volume= 0.042 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach 4R : POST DEVELOPMENT PEAK DISCHARGE Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 96.91' @ 12.56 hrs Surf.Area= 432 sf Storage= 461 cf Plug-Flow detention time= 27.9 min calculated for 0.042 af (100% of inflow) Center-of-Mass det. time= 27.8 min ( 890.9 - 863.0 ) Volume Invert Avail.Storage Storage Description #1 95.00' 937 cf 12.00'W x 36.00'L x 6.00'H Prismatoid 2,592 cf Overall - 509 cf Embedded = 2,083 cf x 45.0% Voids #2 95.00' 509 cf 6.00'D x 6.00'H Vertical Cone/Cylinder x 3 Inside #1 1,446 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 95.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 100.80'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.12 cfs @ 12.56 hrs HW=96.91' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.12 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=95.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 88HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.240 ac Peak Elev=96.91' Storage=461 cf 0.55 cfs 0.12 cfs 0.12 cfs 0.00 cfs Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 101 100 99 98 97 96 95 Exfiltration Broad-Crested Rectangular Weir Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 89HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Wetted Storage Stage-Area-Storage Storage (cubic-feet) 1,4001,2001,0008006004002000 Surface/Horizontal/Wetted Area (sq-ft) 1,0009008007006005004003002001000 El e v a t i o n ( f e e t ) 101 100 99 98 97 96 95 Prismatoid + Vertical Cone/Cylinder Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 90HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 95.00 0.00 0.00 0.00 0.50 0.00 0 95.00 0.00 0.00 0.00 1.00 0.00 0 95.00 0.00 0.00 0.00 1.50 0.00 0 95.00 0.00 0.00 0.00 2.00 0.00 0 95.00 0.00 0.00 0.00 2.50 0.00 0 95.00 0.00 0.00 0.00 3.00 0.00 0 95.00 0.00 0.00 0.00 3.50 0.00 0 95.00 0.00 0.00 0.00 4.00 0.00 0 95.00 0.00 0.00 0.00 4.50 0.00 0 95.00 0.00 0.00 0.00 5.00 0.00 0 95.00 0.00 0.00 0.00 5.50 0.00 0 95.00 0.00 0.00 0.00 6.00 0.00 0 95.00 0.00 0.00 0.00 6.50 0.00 0 95.00 0.00 0.00 0.00 7.00 0.00 0 95.00 0.00 0.00 0.00 7.50 0.00 0 95.00 0.00 0.00 0.00 8.00 0.00 0 95.00 0.00 0.00 0.00 8.50 0.00 0 95.00 0.00 0.00 0.00 9.00 0.00 0 95.00 0.00 0.00 0.00 9.50 0.00 0 95.00 0.00 0.00 0.00 10.00 0.00 0 95.00 0.00 0.00 0.00 10.50 0.00 0 95.00 0.00 0.00 0.00 11.00 0.00 0 95.00 0.00 0.00 0.00 11.50 0.02 1 95.00 0.02 0.02 0.00 12.00 0.28 51 95.21 0.09 0.09 0.00 12.50 0.16 456 96.89 0.12 0.12 0.00 13.00 0.07 412 96.71 0.11 0.11 0.00 13.50 0.06 321 96.33 0.11 0.11 0.00 14.00 0.05 226 95.94 0.10 0.10 0.00 14.50 0.04 130 95.54 0.09 0.09 0.00 15.00 0.04 38 95.16 0.09 0.09 0.00 15.50 0.03 1 95.00 0.03 0.03 0.00 16.00 0.03 1 95.00 0.03 0.03 0.00 16.50 0.02 1 95.00 0.02 0.02 0.00 17.00 0.02 1 95.00 0.02 0.02 0.00 17.50 0.02 1 95.00 0.02 0.02 0.00 18.00 0.02 0 95.00 0.02 0.02 0.00 18.50 0.02 0 95.00 0.02 0.02 0.00 19.00 0.01 0 95.00 0.01 0.01 0.00 19.50 0.01 0 95.00 0.01 0.01 0.00 20.00 0.01 0 95.00 0.01 0.01 0.00 20.50 0.01 0 95.00 0.01 0.01 0.00 21.00 0.01 0 95.00 0.01 0.01 0.00 21.50 0.01 0 95.00 0.01 0.01 0.00 22.00 0.01 0 95.00 0.01 0.01 0.00 22.50 0.01 0 95.00 0.01 0.01 0.00 23.00 0.01 0 95.00 0.01 0.01 0.00 23.50 0.01 0 95.00 0.01 0.01 0.00 24.00 0.01 0 95.00 0.01 0.01 0.00 24.50 0.00 0 95.00 0.00 0.00 0.00 25.00 0.00 0 95.00 0.00 0.00 0.00 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 91HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 95.00 0.00 0.00 0.00 95.10 0.08 0.08 0.00 95.20 0.09 0.09 0.00 95.30 0.09 0.09 0.00 95.40 0.09 0.09 0.00 95.50 0.09 0.09 0.00 95.60 0.09 0.09 0.00 95.70 0.10 0.10 0.00 95.80 0.10 0.10 0.00 95.90 0.10 0.10 0.00 96.00 0.10 0.10 0.00 96.10 0.10 0.10 0.00 96.20 0.10 0.10 0.00 96.30 0.11 0.11 0.00 96.40 0.11 0.11 0.00 96.50 0.11 0.11 0.00 96.60 0.11 0.11 0.00 96.70 0.11 0.11 0.00 96.80 0.12 0.12 0.00 96.90 0.12 0.12 0.00 97.00 0.12 0.12 0.00 97.10 0.12 0.12 0.00 97.20 0.12 0.12 0.00 97.30 0.12 0.12 0.00 97.40 0.13 0.13 0.00 97.50 0.13 0.13 0.00 97.60 0.13 0.13 0.00 97.70 0.13 0.13 0.00 97.80 0.13 0.13 0.00 97.90 0.14 0.14 0.00 98.00 0.14 0.14 0.00 98.10 0.14 0.14 0.00 98.20 0.14 0.14 0.00 98.30 0.14 0.14 0.00 98.40 0.15 0.15 0.00 98.50 0.15 0.15 0.00 98.60 0.15 0.15 0.00 98.70 0.15 0.15 0.00 98.80 0.15 0.15 0.00 98.90 0.15 0.15 0.00 99.00 0.16 0.16 0.00 99.10 0.16 0.16 0.00 99.20 0.16 0.16 0.00 99.30 0.16 0.16 0.00 99.40 0.16 0.16 0.00 99.50 0.17 0.17 0.00 99.60 0.17 0.17 0.00 99.70 0.17 0.17 0.00 99.80 0.17 0.17 0.00 99.90 0.17 0.17 0.00 100.00 0.17 0.17 0.00 100.10 0.18 0.18 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 100.20 0.18 0.18 0.00 100.30 0.18 0.18 0.00 100.40 0.18 0.18 0.00 100.50 0.18 0.18 0.00 100.60 0.19 0.19 0.00 100.70 0.19 0.19 0.00 100.80 0.19 0.19 0.00 100.90 1.18 0.19 0.99 101.00 2.98 0.19 2.79 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 92HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 95.00 432 0 95.10 442 24 95.20 451 48 95.30 461 72 95.40 470 96 95.50 480 121 95.60 490 145 95.70 499 169 95.80 509 193 95.90 518 217 96.00 528 241 96.10 538 265 96.20 547 289 96.30 557 313 96.40 566 337 96.50 576 362 96.60 586 386 96.70 595 410 96.80 605 434 96.90 614 458 97.00 624 482 97.10 634 506 97.20 643 530 97.30 653 554 97.40 662 579 97.50 672 603 97.60 682 627 97.70 691 651 97.80 701 675 97.90 710 699 98.00 720 723 98.10 730 747 98.20 739 771 98.30 749 795 98.40 758 820 98.50 768 844 98.60 778 868 98.70 787 892 98.80 797 916 98.90 806 940 99.00 816 964 99.10 826 988 99.20 835 1,012 99.30 845 1,037 99.40 854 1,061 99.50 864 1,085 99.60 874 1,109 99.70 883 1,133 99.80 893 1,157 99.90 902 1,181 100.00 912 1,205 100.10 922 1,229 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 100.20 931 1,253 100.30 941 1,278 100.40 950 1,302 100.50 960 1,326 100.60 970 1,350 100.70 979 1,374 100.80 989 1,398 100.90 998 1,422 101.00 1,008 1,446 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 93HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB1: Roof Leader - 6" ADS Pipe Inflow Area = 0.030 ac,100.00% Impervious, Inflow Depth = 6.26" for 25-Year event Inflow = 0.19 cfs @ 12.08 hrs, Volume= 0.016 af Outflow = 0.19 cfs @ 12.08 hrs, Volume= 0.016 af, Atten= 0%, Lag= 0.0 min Primary = 0.19 cfs @ 12.08 hrs, Volume= 0.016 af Routed to Pond 1P : One (1) 19.9' x 8.25' x 3' Leach Chamber System Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 105.15' @ 12.08 hrs Device Routing Invert Outlet Devices #1 Primary 105.00'6.0" Round Culvert X 4.00 L= 50.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 105.00' / 104.00' S= 0.0200 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.20 sf Primary OutFlow Max=0.19 cfs @ 12.08 hrs HW=105.15' TW=101.73' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.19 cfs @ 1.02 fps) Pond CB1: Roof Leader - 6" ADS Pipe Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.030 ac Peak Elev=105.15' 6.0" Round Culvert x 4.00 n=0.020 L=50.0' S=0.0200 '/' 0.19 cfs 0.19 cfs Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 94HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB1: Roof Leader - 6" ADS Pipe Primary Stage-Discharge Discharge (cfs) 10 El e v a t i o n ( f e e t ) 105.5 105.48 105.46 105.44 105.42 105.4 105.38 105.36 105.34 105.32 105.3 105.28 105.26 105.24 105.22 105.2 105.18 105.16 105.14 105.12 105.1 105.08 105.06 105.04 105.02 105 Culvert Pond CB1: Roof Leader - 6" ADS Pipe Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 105.5 105.48 105.46 105.44 105.42 105.4 105.38 105.36 105.34 105.32 105.3 105.28 105.26 105.24 105.22 105.2 105.18 105.16 105.14 105.12 105.1 105.08 105.06 105.04 105.02 105 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 95HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB1: Roof Leader - 6" ADS Pipe Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 105.00 0.00 0.50 0.00 105.00 0.00 1.00 0.00 105.01 0.00 1.50 0.00 105.01 0.00 2.00 0.00 105.01 0.00 2.50 0.00 105.01 0.00 3.00 0.00 105.01 0.00 3.50 0.00 105.01 0.00 4.00 0.00 105.02 0.00 4.50 0.00 105.02 0.00 5.00 0.00 105.02 0.00 5.50 0.00 105.02 0.00 6.00 0.00 105.02 0.00 6.50 0.00 105.02 0.00 7.00 0.00 105.02 0.00 7.50 0.00 105.02 0.00 8.00 0.00 105.02 0.00 8.50 0.01 105.03 0.01 9.00 0.01 105.03 0.01 9.50 0.01 105.03 0.01 10.00 0.01 105.03 0.01 10.50 0.01 105.04 0.01 11.00 0.01 105.04 0.01 11.50 0.02 105.05 0.02 12.00 0.12 105.11 0.12 12.50 0.04 105.06 0.04 13.00 0.02 105.04 0.02 13.50 0.01 105.04 0.01 14.00 0.01 105.03 0.01 14.50 0.01 105.03 0.01 15.00 0.01 105.03 0.01 15.50 0.01 105.03 0.01 16.00 0.01 105.03 0.01 16.50 0.00 105.02 0.00 17.00 0.00 105.02 0.00 17.50 0.00 105.02 0.00 18.00 0.00 105.02 0.00 18.50 0.00 105.02 0.00 19.00 0.00 105.02 0.00 19.50 0.00 105.02 0.00 20.00 0.00 105.02 0.00 20.50 0.00 105.02 0.00 21.00 0.00 105.02 0.00 21.50 0.00 105.02 0.00 22.00 0.00 105.02 0.00 22.50 0.00 105.02 0.00 23.00 0.00 105.02 0.00 23.50 0.00 105.02 0.00 24.00 0.00 105.01 0.00 24.50 0.00 105.00 0.00 25.00 0.00 105.00 0.00 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 96HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB1: Roof Leader - 6" ADS Pipe Elevation (feet) Primary (cfs) 105.00 0.00 105.01 0.00 105.02 0.00 105.03 0.01 105.04 0.01 105.05 0.02 105.06 0.03 105.07 0.05 105.08 0.06 105.09 0.08 105.10 0.10 105.11 0.11 105.12 0.13 105.13 0.16 105.14 0.18 105.15 0.21 105.16 0.23 105.17 0.26 105.18 0.29 105.19 0.32 105.20 0.35 105.21 0.39 105.22 0.42 105.23 0.45 105.24 0.49 105.25 0.53 105.26 0.57 105.27 0.60 105.28 0.64 105.29 0.68 105.30 0.72 105.31 0.77 105.32 0.81 105.33 0.85 105.34 0.89 105.35 0.93 105.36 0.98 105.37 1.02 105.38 1.06 105.39 1.10 105.40 1.15 105.41 1.19 105.42 1.23 105.43 1.27 105.44 1.31 105.45 1.34 105.46 1.38 105.47 1.41 105.48 1.44 105.49 1.47 105.50 1.49 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 97HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB1: Roof Leader - 6" ADS Pipe Elevation (feet) Storage (acre-feet) 105.00 0.000 105.01 0.000 105.02 0.000 105.03 0.000 105.04 0.000 105.05 0.000 105.06 0.000 105.07 0.000 105.08 0.000 105.09 0.000 105.10 0.000 105.11 0.000 105.12 0.000 105.13 0.000 105.14 0.000 105.15 0.000 105.16 0.000 105.17 0.000 105.18 0.000 105.19 0.000 105.20 0.000 105.21 0.000 105.22 0.000 105.23 0.000 105.24 0.000 105.25 0.000 105.26 0.000 105.27 0.000 105.28 0.000 105.29 0.000 105.30 0.000 105.31 0.000 105.32 0.000 105.33 0.000 105.34 0.000 105.35 0.000 105.36 0.000 105.37 0.000 105.38 0.000 105.39 0.000 105.40 0.000 105.41 0.000 105.42 0.000 105.43 0.000 105.44 0.000 105.45 0.000 105.46 0.000 105.47 0.000 105.48 0.000 105.49 0.000 105.50 0.000 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 98HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB2: Catch Basin At Lower Driveway Inflow Area = 0.240 ac, 0.00% Impervious, Inflow Depth = 2.08" for 25-Year event Inflow = 0.55 cfs @ 12.10 hrs, Volume= 0.042 af Outflow = 0.55 cfs @ 12.10 hrs, Volume= 0.042 af, Atten= 0%, Lag= 0.0 min Primary = 0.55 cfs @ 12.10 hrs, Volume= 0.042 af Routed to Pond 2P : One (1) 36.0' x 12.0' x 6' Leach Chamber System Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 105.79' @ 12.10 hrs Device Routing Invert Outlet Devices #1 Primary 105.50'12.0" Round Catch Basin X 2.00 L= 50.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 105.50' / 102.50' S= 0.0600 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.79 sf Primary OutFlow Max=0.55 cfs @ 12.10 hrs HW=105.79' TW=95.72' (Dynamic Tailwater) 1=Catch Basin (Inlet Controls 0.55 cfs @ 1.45 fps) Pond CB2: Catch Basin At Lower Driveway Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.240 ac Peak Elev=105.79' 12.0" Round Culvert x 2.00 n=0.020 L=50.0' S=0.0600 '/' 0.55 cfs 0.55 cfs Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 99HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB2: Catch Basin At Lower Driveway Primary Stage-Discharge Discharge (cfs) 43210 El e v a t i o n ( f e e t ) 106 Catch Basin Pond CB2: Catch Basin At Lower Driveway Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 106 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 100HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB2: Catch Basin At Lower Driveway Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 105.50 0.00 0.50 0.00 105.50 0.00 1.00 0.00 105.50 0.00 1.50 0.00 105.50 0.00 2.00 0.00 105.50 0.00 2.50 0.00 105.50 0.00 3.00 0.00 105.50 0.00 3.50 0.00 105.50 0.00 4.00 0.00 105.50 0.00 4.50 0.00 105.50 0.00 5.00 0.00 105.50 0.00 5.50 0.00 105.50 0.00 6.00 0.00 105.50 0.00 6.50 0.00 105.50 0.00 7.00 0.00 105.50 0.00 7.50 0.00 105.50 0.00 8.00 0.00 105.50 0.00 8.50 0.00 105.50 0.00 9.00 0.00 105.50 0.00 9.50 0.00 105.50 0.00 10.00 0.00 105.50 0.00 10.50 0.00 105.50 0.00 11.00 0.00 105.52 0.00 11.50 0.02 105.55 0.02 12.00 0.28 105.70 0.28 12.50 0.16 105.65 0.16 13.00 0.07 105.60 0.07 13.50 0.06 105.59 0.06 14.00 0.05 105.58 0.05 14.50 0.04 105.58 0.04 15.00 0.04 105.57 0.04 15.50 0.03 105.57 0.03 16.00 0.03 105.56 0.03 16.50 0.02 105.56 0.02 17.00 0.02 105.55 0.02 17.50 0.02 105.55 0.02 18.00 0.02 105.55 0.02 18.50 0.02 105.55 0.02 19.00 0.01 105.55 0.01 19.50 0.01 105.54 0.01 20.00 0.01 105.54 0.01 20.50 0.01 105.54 0.01 21.00 0.01 105.54 0.01 21.50 0.01 105.54 0.01 22.00 0.01 105.54 0.01 22.50 0.01 105.54 0.01 23.00 0.01 105.54 0.01 23.50 0.01 105.54 0.01 24.00 0.01 105.54 0.01 24.50 0.00 105.50 0.00 25.00 0.00 105.50 0.00 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 101HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB2: Catch Basin At Lower Driveway Elevation (feet) Primary (cfs) 105.50 0.00 105.51 0.00 105.52 0.00 105.53 0.01 105.54 0.01 105.55 0.02 105.56 0.03 105.57 0.03 105.58 0.04 105.59 0.06 105.60 0.07 105.61 0.08 105.62 0.10 105.63 0.12 105.64 0.13 105.65 0.15 105.66 0.17 105.67 0.20 105.68 0.22 105.69 0.24 105.70 0.27 105.71 0.30 105.72 0.32 105.73 0.35 105.74 0.38 105.75 0.41 105.76 0.44 105.77 0.48 105.78 0.51 105.79 0.55 105.80 0.58 105.81 0.62 105.82 0.66 105.83 0.70 105.84 0.74 105.85 0.78 105.86 0.82 105.87 0.86 105.88 0.91 105.89 0.95 105.90 1.00 105.91 1.04 105.92 1.09 105.93 1.14 105.94 1.19 105.95 1.24 105.96 1.29 105.97 1.34 105.98 1.39 105.99 1.44 106.00 1.49 106.01 1.55 Elevation (feet) Primary (cfs) 106.02 1.60 106.03 1.65 106.04 1.71 106.05 1.76 106.06 1.82 106.07 1.88 106.08 1.93 106.09 1.99 106.10 2.05 106.11 2.11 106.12 2.17 106.13 2.22 106.14 2.28 106.15 2.34 106.16 2.40 106.17 2.46 106.18 2.52 106.19 2.58 106.20 2.64 106.21 2.70 106.22 2.76 106.23 2.82 106.24 2.88 106.25 2.94 106.26 3.00 106.27 3.06 106.28 3.12 106.29 3.18 106.30 3.24 106.31 3.30 106.32 3.36 106.33 3.41 106.34 3.47 106.35 3.53 106.36 3.58 106.37 3.64 106.38 3.69 106.39 3.74 106.40 3.80 106.41 3.85 106.42 3.90 106.43 3.95 106.44 3.99 106.45 4.04 106.46 4.08 106.47 4.12 106.48 4.16 106.49 4.19 106.50 4.22 Type III 24-hr 25-Year Rainfall=6.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 102HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB2: Catch Basin At Lower Driveway Elevation (feet) Storage (acre-feet) 105.50 0.000 105.51 0.000 105.52 0.000 105.53 0.000 105.54 0.000 105.55 0.000 105.56 0.000 105.57 0.000 105.58 0.000 105.59 0.000 105.60 0.000 105.61 0.000 105.62 0.000 105.63 0.000 105.64 0.000 105.65 0.000 105.66 0.000 105.67 0.000 105.68 0.000 105.69 0.000 105.70 0.000 105.71 0.000 105.72 0.000 105.73 0.000 105.74 0.000 105.75 0.000 105.76 0.000 105.77 0.000 105.78 0.000 105.79 0.000 105.80 0.000 105.81 0.000 105.82 0.000 105.83 0.000 105.84 0.000 105.85 0.000 105.86 0.000 105.87 0.000 105.88 0.000 105.89 0.000 105.90 0.000 105.91 0.000 105.92 0.000 105.93 0.000 105.94 0.000 105.95 0.000 105.96 0.000 105.97 0.000 105.98 0.000 105.99 0.000 106.00 0.000 106.01 0.000 Elevation (feet) Storage (acre-feet) 106.02 0.000 106.03 0.000 106.04 0.000 106.05 0.000 106.06 0.000 106.07 0.000 106.08 0.000 106.09 0.000 106.10 0.000 106.11 0.000 106.12 0.000 106.13 0.000 106.14 0.000 106.15 0.000 106.16 0.000 106.17 0.000 106.18 0.000 106.19 0.000 106.20 0.000 106.21 0.000 106.22 0.000 106.23 0.000 106.24 0.000 106.25 0.000 106.26 0.000 106.27 0.000 106.28 0.000 106.29 0.000 106.30 0.000 106.31 0.000 106.32 0.000 106.33 0.000 106.34 0.000 106.35 0.000 106.36 0.000 106.37 0.000 106.38 0.000 106.39 0.000 106.40 0.000 106.41 0.000 106.42 0.000 106.43 0.000 106.44 0.000 106.45 0.000 106.46 0.000 106.47 0.000 106.48 0.000 106.49 0.000 106.50 0.000 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 103HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1Ex: Existing Parcel Area Runoff = 0.29 cfs @ 12.38 hrs, Volume= 0.070 af, Depth= 0.54" Routed to Reach 1Dis : Pre- Dev Peak Discharge Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 100-Year Rainfall=8.50" Area (sf) CN Description 67,651 30 Woods, Good, HSG A 67,651 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1Ex: Existing Parcel Area Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 100-Year Rainfall=8.50" Runoff Area=67,651 sf Runoff Volume=0.070 af Runoff Depth=0.54" Tc=6.0 min CN=30 0.29 cfs Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 104HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1Ex: Existing Parcel Area Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.04 0.00 0.00 1.00 0.08 0.00 0.00 1.50 0.13 0.00 0.00 2.00 0.17 0.00 0.00 2.50 0.21 0.00 0.00 3.00 0.26 0.00 0.00 3.50 0.31 0.00 0.00 4.00 0.37 0.00 0.00 4.50 0.42 0.00 0.00 5.00 0.48 0.00 0.00 5.50 0.55 0.00 0.00 6.00 0.61 0.00 0.00 6.50 0.69 0.00 0.00 7.00 0.77 0.00 0.00 7.50 0.86 0.00 0.00 8.00 0.97 0.00 0.00 8.50 1.09 0.00 0.00 9.00 1.24 0.00 0.00 9.50 1.41 0.00 0.00 10.00 1.61 0.00 0.00 10.50 1.84 0.00 0.00 11.00 2.12 0.00 0.00 11.50 2.53 0.00 0.00 12.00 4.25 0.00 0.00 12.50 5.97 0.07 0.24 13.00 6.37 0.12 0.14 13.50 6.66 0.16 0.12 14.00 6.89 0.19 0.11 14.50 7.09 0.23 0.10 15.00 7.26 0.26 0.10 15.50 7.41 0.29 0.09 16.00 7.53 0.31 0.07 16.50 7.64 0.34 0.07 17.00 7.73 0.36 0.06 17.50 7.81 0.37 0.06 18.00 7.89 0.39 0.05 18.50 7.95 0.41 0.05 19.00 8.02 0.42 0.05 19.50 8.08 0.44 0.04 20.00 8.13 0.45 0.04 20.50 8.19 0.46 0.04 21.00 8.24 0.47 0.04 21.50 8.29 0.49 0.04 22.00 8.34 0.50 0.04 22.50 8.38 0.51 0.03 23.00 8.42 0.52 0.03 23.50 8.46 0.53 0.03 24.00 8.50 0.54 0.03 24.50 8.50 0.54 0.00 25.00 8.50 0.54 0.00 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 105HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Half of Roof Runoff Runoff = 0.25 cfs @ 12.08 hrs, Volume= 0.021 af, Depth= 8.26" Routed to Pond CB1 : Roof Leader - 6" ADS Pipe Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 100-Year Rainfall=8.50" Area (sf) CN Description * 1,325 98 Roof Area 1,325 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 1S: Half of Roof Runoff Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 100-Year Rainfall=8.50" Runoff Area=1,325 sf Runoff Volume=0.021 af Runoff Depth=8.26" Tc=6.0 min CN=98 0.25 cfs Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 106HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 1S: Half of Roof Runoff Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.04 0.00 0.00 1.00 0.08 0.01 0.00 1.50 0.13 0.03 0.00 2.00 0.17 0.05 0.00 2.50 0.21 0.08 0.00 3.00 0.26 0.11 0.00 3.50 0.31 0.15 0.00 4.00 0.37 0.20 0.00 4.50 0.42 0.25 0.00 5.00 0.48 0.30 0.00 5.50 0.55 0.36 0.00 6.00 0.61 0.42 0.00 6.50 0.69 0.49 0.00 7.00 0.77 0.57 0.01 7.50 0.86 0.66 0.01 8.00 0.97 0.76 0.01 8.50 1.09 0.88 0.01 9.00 1.24 1.02 0.01 9.50 1.41 1.19 0.01 10.00 1.61 1.39 0.01 10.50 1.84 1.62 0.02 11.00 2.12 1.90 0.02 11.50 2.53 2.30 0.03 12.00 4.25 4.01 0.16 12.50 5.97 5.73 0.05 13.00 6.37 6.14 0.02 13.50 6.66 6.42 0.02 14.00 6.89 6.65 0.01 14.50 7.09 6.85 0.01 15.00 7.26 7.02 0.01 15.50 7.41 7.17 0.01 16.00 7.53 7.29 0.01 16.50 7.64 7.40 0.01 17.00 7.73 7.49 0.01 17.50 7.81 7.58 0.00 18.00 7.89 7.65 0.00 18.50 7.95 7.71 0.00 19.00 8.02 7.78 0.00 19.50 8.08 7.84 0.00 20.00 8.13 7.89 0.00 20.50 8.19 7.95 0.00 21.00 8.24 8.00 0.00 21.50 8.29 8.05 0.00 22.00 8.34 8.10 0.00 22.50 8.38 8.14 0.00 23.00 8.42 8.18 0.00 23.50 8.46 8.22 0.00 24.00 8.50 8.26 0.00 24.50 8.50 8.26 0.00 25.00 8.50 8.26 0.00 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 107HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Gravel Driveway & Landscape Aras Runoff = 0.96 cfs @ 12.09 hrs, Volume= 0.070 af, Depth= 3.48" Routed to Pond CB2 : Catch Basin At Lower Driveway Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 100-Year Rainfall=8.50" Area (sf) CN Description 5,465 76 Gravel roads, HSG A 5,000 39 >75% Grass cover, Good, HSG A 10,465 58 Weighted Average 10,465 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 2S: Gravel Driveway & Landscape Aras Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Type III 24-hr 100-Year Rainfall=8.50" Runoff Area=10,465 sf Runoff Volume=0.070 af Runoff Depth=3.48" Tc=6.0 min CN=58 0.96 cfs Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 108HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 2S: Gravel Driveway & Landscape Aras Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.04 0.00 0.00 1.00 0.08 0.00 0.00 1.50 0.13 0.00 0.00 2.00 0.17 0.00 0.00 2.50 0.21 0.00 0.00 3.00 0.26 0.00 0.00 3.50 0.31 0.00 0.00 4.00 0.37 0.00 0.00 4.50 0.42 0.00 0.00 5.00 0.48 0.00 0.00 5.50 0.55 0.00 0.00 6.00 0.61 0.00 0.00 6.50 0.69 0.00 0.00 7.00 0.77 0.00 0.00 7.50 0.86 0.00 0.00 8.00 0.97 0.00 0.00 8.50 1.09 0.00 0.00 9.00 1.24 0.00 0.00 9.50 1.41 0.00 0.00 10.00 1.61 0.00 0.00 10.50 1.84 0.02 0.01 11.00 2.12 0.06 0.02 11.50 2.53 0.14 0.05 12.00 4.25 0.78 0.52 12.50 5.97 1.74 0.25 13.00 6.37 1.99 0.11 13.50 6.66 2.18 0.09 14.00 6.89 2.34 0.07 14.50 7.09 2.47 0.06 15.00 7.26 2.59 0.05 15.50 7.41 2.69 0.05 16.00 7.53 2.78 0.04 16.50 7.64 2.85 0.03 17.00 7.73 2.92 0.03 17.50 7.81 2.98 0.03 18.00 7.89 3.03 0.02 18.50 7.95 3.08 0.02 19.00 8.02 3.12 0.02 19.50 8.08 3.17 0.02 20.00 8.13 3.21 0.02 20.50 8.19 3.25 0.02 21.00 8.24 3.29 0.02 21.50 8.29 3.32 0.02 22.00 8.34 3.36 0.02 22.50 8.38 3.39 0.02 23.00 8.42 3.42 0.01 23.50 8.46 3.45 0.01 24.00 8.50 3.48 0.01 24.50 8.50 3.48 0.00 25.00 8.50 3.48 0.00 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 109HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Undeveloped Areas of Parcel Runoff = 0.25 cfs @ 12.38 hrs, Volume= 0.059 af, Depth= 0.54" Routed to Reach 4R : POST DEVELOPMENT PEAK DISCHARGE Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Type III 24-hr 100-Year Rainfall=8.50" Area (sf) CN Description 56,801 30 Woods, Good, HSG A 56,801 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Minimum Subcatchment 3S: Undeveloped Areas of Parcel Runoff Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr 100-Year Rainfall=8.50" Runoff Area=56,801 sf Runoff Volume=0.059 af Runoff Depth=0.54" Tc=6.0 min CN=30 0.25 cfs Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 110HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 3S: Undeveloped Areas of Parcel Time (hours) Precip. (inches) Excess (inches) Runoff (cfs) 0.00 0.00 0.00 0.00 0.50 0.04 0.00 0.00 1.00 0.08 0.00 0.00 1.50 0.13 0.00 0.00 2.00 0.17 0.00 0.00 2.50 0.21 0.00 0.00 3.00 0.26 0.00 0.00 3.50 0.31 0.00 0.00 4.00 0.37 0.00 0.00 4.50 0.42 0.00 0.00 5.00 0.48 0.00 0.00 5.50 0.55 0.00 0.00 6.00 0.61 0.00 0.00 6.50 0.69 0.00 0.00 7.00 0.77 0.00 0.00 7.50 0.86 0.00 0.00 8.00 0.97 0.00 0.00 8.50 1.09 0.00 0.00 9.00 1.24 0.00 0.00 9.50 1.41 0.00 0.00 10.00 1.61 0.00 0.00 10.50 1.84 0.00 0.00 11.00 2.12 0.00 0.00 11.50 2.53 0.00 0.00 12.00 4.25 0.00 0.00 12.50 5.97 0.07 0.21 13.00 6.37 0.12 0.12 13.50 6.66 0.16 0.10 14.00 6.89 0.19 0.09 14.50 7.09 0.23 0.09 15.00 7.26 0.26 0.08 15.50 7.41 0.29 0.07 16.00 7.53 0.31 0.06 16.50 7.64 0.34 0.06 17.00 7.73 0.36 0.05 17.50 7.81 0.37 0.05 18.00 7.89 0.39 0.04 18.50 7.95 0.41 0.04 19.00 8.02 0.42 0.04 19.50 8.08 0.44 0.04 20.00 8.13 0.45 0.04 20.50 8.19 0.46 0.03 21.00 8.24 0.47 0.03 21.50 8.29 0.49 0.03 22.00 8.34 0.50 0.03 22.50 8.38 0.51 0.03 23.00 8.42 0.52 0.03 23.50 8.46 0.53 0.03 24.00 8.50 0.54 0.03 24.50 8.50 0.54 0.00 25.00 8.50 0.54 0.00 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 111HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 1Dis: Pre- Dev Peak Discharge Inflow Area = 1.553 ac, 0.00% Impervious, Inflow Depth = 0.54" for 100-Year event Inflow = 0.29 cfs @ 12.38 hrs, Volume= 0.070 af Outflow = 0.29 cfs @ 12.38 hrs, Volume= 0.070 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 1Dis: Pre- Dev Peak Discharge Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=1.553 ac 0.29 cfs 0.29 cfs Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 112HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 1Dis: Pre- Dev Peak Discharge Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.24 0.24 13.00 0.14 0.14 13.50 0.12 0.12 14.00 0.11 0.11 14.50 0.10 0.10 15.00 0.10 0.10 15.50 0.09 0.09 16.00 0.07 0.07 16.50 0.07 0.07 17.00 0.06 0.06 17.50 0.06 0.06 18.00 0.05 0.05 18.50 0.05 0.05 19.00 0.05 0.05 19.50 0.04 0.04 20.00 0.04 0.04 20.50 0.04 0.04 21.00 0.04 0.04 21.50 0.04 0.04 22.00 0.04 0.04 22.50 0.03 0.03 23.00 0.03 0.03 23.50 0.03 0.03 24.00 0.03 0.03 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 113HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Reach 4R: POST DEVELOPMENT PEAK DISCHARGE Inflow Area = 1.544 ac, 0.00% Impervious, Inflow Depth = 0.46" for 100-Year event Inflow = 0.25 cfs @ 12.38 hrs, Volume= 0.059 af Outflow = 0.25 cfs @ 12.38 hrs, Volume= 0.059 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Reach 4R: POST DEVELOPMENT PEAK DISCHARGE Inflow Outflow Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=1.544 ac 0.25 cfs 0.25 cfs Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 114HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Reach 4R: POST DEVELOPMENT PEAK DISCHARGE Time (hours) Inflow (cfs) Elevation (feet) Outflow (cfs) 0.00 0.00 0.00 0.50 0.00 0.00 1.00 0.00 0.00 1.50 0.00 0.00 2.00 0.00 0.00 2.50 0.00 0.00 3.00 0.00 0.00 3.50 0.00 0.00 4.00 0.00 0.00 4.50 0.00 0.00 5.00 0.00 0.00 5.50 0.00 0.00 6.00 0.00 0.00 6.50 0.00 0.00 7.00 0.00 0.00 7.50 0.00 0.00 8.00 0.00 0.00 8.50 0.00 0.00 9.00 0.00 0.00 9.50 0.00 0.00 10.00 0.00 0.00 10.50 0.00 0.00 11.00 0.00 0.00 11.50 0.00 0.00 12.00 0.00 0.00 12.50 0.21 0.21 13.00 0.12 0.12 13.50 0.10 0.10 14.00 0.09 0.09 14.50 0.09 0.09 15.00 0.08 0.08 15.50 0.07 0.07 16.00 0.06 0.06 16.50 0.06 0.06 17.00 0.05 0.05 17.50 0.05 0.05 18.00 0.04 0.04 18.50 0.04 0.04 19.00 0.04 0.04 19.50 0.04 0.04 20.00 0.04 0.04 20.50 0.03 0.03 21.00 0.03 0.03 21.50 0.03 0.03 22.00 0.03 0.03 22.50 0.03 0.03 23.00 0.03 0.03 23.50 0.03 0.03 24.00 0.03 0.03 24.50 0.00 0.00 25.00 0.00 0.00 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 115HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Area = 0.030 ac,100.00% Impervious, Inflow Depth = 8.26" for 100-Year event Inflow = 0.25 cfs @ 12.08 hrs, Volume= 0.021 af Outflow = 0.05 cfs @ 12.49 hrs, Volume= 0.021 af, Atten= 79%, Lag= 24.7 min Discarded = 0.05 cfs @ 12.49 hrs, Volume= 0.021 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 103.04' @ 12.49 hrs Surf.Area= 164 sf Storage= 227 cf Plug-Flow detention time= 25.3 min calculated for 0.021 af (100% of inflow) Center-of-Mass det. time= 25.3 min ( 765.8 - 740.5 ) Volume Invert Avail.Storage Storage Description #1 101.00' 130 cf 8.25'W x 19.90'L x 3.00'H Prismatoid 493 cf Overall - 203 cf Embedded = 290 cf x 45.0% Voids #2 101.00' 203 cf 4.25'W x 7.95'L x 3.00'H Prismatoid x 2 Inside #1 333 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 101.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' Discarded OutFlow Max=0.05 cfs @ 12.49 hrs HW=103.04' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.05 cfs) Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Inflow Discarded Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.030 ac Peak Elev=103.04' Storage=227 cf 0.25 cfs 0.05 cfs Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 116HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Discarded Stage-Discharge Discharge (cfs) 0.060.0550.050.0450.040.0350.030.0250.020.0150.010.0050 El e v a t i o n ( f e e t ) 104 103 102 101 Exfiltration Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Wetted Storage Stage-Area-Storage Storage (cubic-feet) 300250200150100500 Surface/Horizontal/Wetted Area (sq-ft) 300250200150100500 El e v a t i o n ( f e e t ) 104 103 102 101 Prismatoid + Prismatoid Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 117HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Discarded (cfs) 0.00 0.00 0 101.00 0.00 0.50 0.00 0 101.00 0.00 1.00 0.00 0 101.00 0.00 1.50 0.00 0 101.00 0.00 2.00 0.00 0 101.00 0.00 2.50 0.00 0 101.00 0.00 3.00 0.00 0 101.00 0.00 3.50 0.00 0 101.00 0.00 4.00 0.00 0 101.00 0.00 4.50 0.00 0 101.00 0.00 5.00 0.00 0 101.00 0.00 5.50 0.00 0 101.00 0.00 6.00 0.00 0 101.00 0.00 6.50 0.00 0 101.00 0.00 7.00 0.01 0 101.00 0.01 7.50 0.01 0 101.00 0.01 8.00 0.01 0 101.00 0.01 8.50 0.01 0 101.00 0.01 9.00 0.01 0 101.00 0.01 9.50 0.01 0 101.00 0.01 10.00 0.01 0 101.00 0.01 10.50 0.02 1 101.00 0.02 11.00 0.02 1 101.01 0.02 11.50 0.03 1 101.01 0.03 12.00 0.16 69 101.62 0.04 12.50 0.05 227 103.04 0.05 13.00 0.02 187 102.68 0.05 13.50 0.02 135 102.21 0.04 14.00 0.01 86 101.77 0.04 14.50 0.01 40 101.36 0.04 15.00 0.01 0 101.00 0.01 15.50 0.01 0 101.00 0.01 16.00 0.01 0 101.00 0.01 16.50 0.01 0 101.00 0.01 17.00 0.01 0 101.00 0.01 17.50 0.00 0 101.00 0.00 18.00 0.00 0 101.00 0.00 18.50 0.00 0 101.00 0.00 19.00 0.00 0 101.00 0.00 19.50 0.00 0 101.00 0.00 20.00 0.00 0 101.00 0.00 20.50 0.00 0 101.00 0.00 21.00 0.00 0 101.00 0.00 21.50 0.00 0 101.00 0.00 22.00 0.00 0 101.00 0.00 22.50 0.00 0 101.00 0.00 23.00 0.00 0 101.00 0.00 23.50 0.00 0 101.00 0.00 24.00 0.00 0 101.00 0.00 24.50 0.00 0 101.00 0.00 25.00 0.00 0 101.00 0.00 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 118HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Discarded (cfs) 101.00 0.00 101.02 0.03 101.04 0.03 101.06 0.03 101.08 0.03 101.10 0.03 101.12 0.03 101.14 0.03 101.16 0.03 101.18 0.03 101.20 0.03 101.22 0.03 101.24 0.03 101.26 0.03 101.28 0.03 101.30 0.03 101.32 0.03 101.34 0.04 101.36 0.04 101.38 0.04 101.40 0.04 101.42 0.04 101.44 0.04 101.46 0.04 101.48 0.04 101.50 0.04 101.52 0.04 101.54 0.04 101.56 0.04 101.58 0.04 101.60 0.04 101.62 0.04 101.64 0.04 101.66 0.04 101.68 0.04 101.70 0.04 101.72 0.04 101.74 0.04 101.76 0.04 101.78 0.04 101.80 0.04 101.82 0.04 101.84 0.04 101.86 0.04 101.88 0.04 101.90 0.04 101.92 0.04 101.94 0.04 101.96 0.04 101.98 0.04 102.00 0.04 102.02 0.04 Elevation (feet) Discarded (cfs) 102.04 0.04 102.06 0.04 102.08 0.04 102.10 0.04 102.12 0.04 102.14 0.04 102.16 0.04 102.18 0.04 102.20 0.04 102.22 0.04 102.24 0.04 102.26 0.05 102.28 0.05 102.30 0.05 102.32 0.05 102.34 0.05 102.36 0.05 102.38 0.05 102.40 0.05 102.42 0.05 102.44 0.05 102.46 0.05 102.48 0.05 102.50 0.05 102.52 0.05 102.54 0.05 102.56 0.05 102.58 0.05 102.60 0.05 102.62 0.05 102.64 0.05 102.66 0.05 102.68 0.05 102.70 0.05 102.72 0.05 102.74 0.05 102.76 0.05 102.78 0.05 102.80 0.05 102.82 0.05 102.84 0.05 102.86 0.05 102.88 0.05 102.90 0.05 102.92 0.05 102.94 0.05 102.96 0.05 102.98 0.05 103.00 0.05 103.02 0.05 103.04 0.05 103.06 0.05 Elevation (feet) Discarded (cfs) 103.08 0.05 103.10 0.05 103.12 0.05 103.14 0.05 103.16 0.05 103.18 0.05 103.20 0.06 103.22 0.06 103.24 0.06 103.26 0.06 103.28 0.06 103.30 0.06 103.32 0.06 103.34 0.06 103.36 0.06 103.38 0.06 103.40 0.06 103.42 0.06 103.44 0.06 103.46 0.06 103.48 0.06 103.50 0.06 103.52 0.06 103.54 0.06 103.56 0.06 103.58 0.06 103.60 0.06 103.62 0.06 103.64 0.06 103.66 0.06 103.68 0.06 103.70 0.06 103.72 0.06 103.74 0.06 103.76 0.06 103.78 0.06 103.80 0.06 103.82 0.06 103.84 0.06 103.86 0.06 103.88 0.06 103.90 0.06 103.92 0.06 103.94 0.06 103.96 0.06 103.98 0.06 104.00 0.06 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 119HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 1P: One (1) 19.9' x 8.25' x 3' Leach Chamber System Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 101.00 164 0 101.05 167 6 101.10 170 11 101.15 173 17 101.20 175 22 101.25 178 28 101.30 181 33 101.35 184 39 101.40 187 44 101.45 190 50 101.50 192 56 101.55 195 61 101.60 198 67 101.65 201 72 101.70 204 78 101.75 206 83 101.80 209 89 101.85 212 94 101.90 215 100 101.95 218 105 102.00 220 111 102.05 223 117 102.10 226 122 102.15 229 128 102.20 232 133 102.25 235 139 102.30 237 144 102.35 240 150 102.40 243 155 102.45 246 161 102.50 249 167 102.55 251 172 102.60 254 178 102.65 257 183 102.70 260 189 102.75 263 194 102.80 266 200 102.85 268 205 102.90 271 211 102.95 274 217 103.00 277 222 103.05 280 228 103.10 282 233 103.15 285 239 103.20 288 244 103.25 291 250 103.30 294 255 103.35 296 261 103.40 299 267 103.45 302 272 103.50 305 278 103.55 308 283 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 103.60 311 289 103.65 313 294 103.70 316 300 103.75 319 305 103.80 322 311 103.85 325 316 103.90 327 322 103.95 330 328 104.00 333 333 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 120HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Inflow Area = 0.240 ac, 0.00% Impervious, Inflow Depth = 3.48" for 100-Year event Inflow = 0.96 cfs @ 12.09 hrs, Volume= 0.070 af Outflow = 0.16 cfs @ 12.62 hrs, Volume= 0.070 af, Atten= 84%, Lag= 31.9 min Discarded = 0.16 cfs @ 12.62 hrs, Volume= 0.070 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach 4R : POST DEVELOPMENT PEAK DISCHARGE Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 99.03' @ 12.62 hrs Surf.Area= 432 sf Storage= 971 cf Plug-Flow detention time= 55.2 min calculated for 0.070 af (100% of inflow) Center-of-Mass det. time= 55.2 min ( 902.5 - 847.3 ) Volume Invert Avail.Storage Storage Description #1 95.00' 937 cf 12.00'W x 36.00'L x 6.00'H Prismatoid 2,592 cf Overall - 509 cf Embedded = 2,083 cf x 45.0% Voids #2 95.00' 509 cf 6.00'D x 6.00'H Vertical Cone/Cylinder x 3 Inside #1 1,446 cf Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 95.00'8.270 in/hr Exfiltration over Wetted area Phase-In= 0.01' #2 Primary 100.80'10.0' long (Profile 6) Broad-Crested Rectangular Weir Head (feet) 0.49 0.98 1.48 Coef. (English) 3.12 3.41 3.59 Discarded OutFlow Max=0.16 cfs @ 12.62 hrs HW=99.03' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.16 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=95.00' TW=0.00' (Dynamic Tailwater) 2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 121HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Inflow Outflow Discarded Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.240 ac Peak Elev=99.03' Storage=971 cf 0.96 cfs 0.16 cfs 0.16 cfs 0.00 cfs Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Total Discarded Primary Stage-Discharge Discharge (cfs) 210 El e v a t i o n ( f e e t ) 101 100 99 98 97 96 95 Exfiltration Broad-Crested Rectangular Weir Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 122HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Wetted Storage Stage-Area-Storage Storage (cubic-feet) 1,4001,2001,0008006004002000 Surface/Horizontal/Wetted Area (sq-ft) 1,0009008007006005004003002001000 El e v a t i o n ( f e e t ) 101 100 99 98 97 96 95 Prismatoid + Vertical Cone/Cylinder Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 123HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Time (hours) Inflow (cfs) Storage (cubic-feet) Elevation (feet) Outflow (cfs) Discarded (cfs) Primary (cfs) 0.00 0.00 0 95.00 0.00 0.00 0.00 0.50 0.00 0 95.00 0.00 0.00 0.00 1.00 0.00 0 95.00 0.00 0.00 0.00 1.50 0.00 0 95.00 0.00 0.00 0.00 2.00 0.00 0 95.00 0.00 0.00 0.00 2.50 0.00 0 95.00 0.00 0.00 0.00 3.00 0.00 0 95.00 0.00 0.00 0.00 3.50 0.00 0 95.00 0.00 0.00 0.00 4.00 0.00 0 95.00 0.00 0.00 0.00 4.50 0.00 0 95.00 0.00 0.00 0.00 5.00 0.00 0 95.00 0.00 0.00 0.00 5.50 0.00 0 95.00 0.00 0.00 0.00 6.00 0.00 0 95.00 0.00 0.00 0.00 6.50 0.00 0 95.00 0.00 0.00 0.00 7.00 0.00 0 95.00 0.00 0.00 0.00 7.50 0.00 0 95.00 0.00 0.00 0.00 8.00 0.00 0 95.00 0.00 0.00 0.00 8.50 0.00 0 95.00 0.00 0.00 0.00 9.00 0.00 0 95.00 0.00 0.00 0.00 9.50 0.00 0 95.00 0.00 0.00 0.00 10.00 0.00 0 95.00 0.00 0.00 0.00 10.50 0.01 0 95.00 0.01 0.01 0.00 11.00 0.02 1 95.00 0.02 0.02 0.00 11.50 0.05 1 95.01 0.05 0.05 0.00 12.00 0.52 185 95.77 0.10 0.10 0.00 12.50 0.25 953 98.95 0.16 0.16 0.00 13.00 0.11 935 98.88 0.15 0.15 0.00 13.50 0.09 833 98.46 0.15 0.15 0.00 14.00 0.07 719 97.98 0.14 0.14 0.00 14.50 0.06 599 97.48 0.13 0.13 0.00 15.00 0.05 481 97.00 0.12 0.12 0.00 15.50 0.05 366 96.52 0.11 0.11 0.00 16.00 0.04 253 96.05 0.10 0.10 0.00 16.50 0.03 143 95.59 0.09 0.09 0.00 17.00 0.03 41 95.17 0.09 0.09 0.00 17.50 0.03 1 95.00 0.03 0.03 0.00 18.00 0.02 1 95.00 0.02 0.02 0.00 18.50 0.02 1 95.00 0.02 0.02 0.00 19.00 0.02 1 95.00 0.02 0.02 0.00 19.50 0.02 1 95.00 0.02 0.02 0.00 20.00 0.02 1 95.00 0.02 0.02 0.00 20.50 0.02 1 95.00 0.02 0.02 0.00 21.00 0.02 1 95.00 0.02 0.02 0.00 21.50 0.02 1 95.00 0.02 0.02 0.00 22.00 0.02 0 95.00 0.02 0.02 0.00 22.50 0.02 0 95.00 0.02 0.02 0.00 23.00 0.01 0 95.00 0.01 0.01 0.00 23.50 0.01 0 95.00 0.01 0.01 0.00 24.00 0.01 0 95.00 0.01 0.01 0.00 24.50 0.00 0 95.00 0.00 0.00 0.00 25.00 0.00 0 95.00 0.00 0.00 0.00 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 124HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 95.00 0.00 0.00 0.00 95.10 0.08 0.08 0.00 95.20 0.09 0.09 0.00 95.30 0.09 0.09 0.00 95.40 0.09 0.09 0.00 95.50 0.09 0.09 0.00 95.60 0.09 0.09 0.00 95.70 0.10 0.10 0.00 95.80 0.10 0.10 0.00 95.90 0.10 0.10 0.00 96.00 0.10 0.10 0.00 96.10 0.10 0.10 0.00 96.20 0.10 0.10 0.00 96.30 0.11 0.11 0.00 96.40 0.11 0.11 0.00 96.50 0.11 0.11 0.00 96.60 0.11 0.11 0.00 96.70 0.11 0.11 0.00 96.80 0.12 0.12 0.00 96.90 0.12 0.12 0.00 97.00 0.12 0.12 0.00 97.10 0.12 0.12 0.00 97.20 0.12 0.12 0.00 97.30 0.12 0.12 0.00 97.40 0.13 0.13 0.00 97.50 0.13 0.13 0.00 97.60 0.13 0.13 0.00 97.70 0.13 0.13 0.00 97.80 0.13 0.13 0.00 97.90 0.14 0.14 0.00 98.00 0.14 0.14 0.00 98.10 0.14 0.14 0.00 98.20 0.14 0.14 0.00 98.30 0.14 0.14 0.00 98.40 0.15 0.15 0.00 98.50 0.15 0.15 0.00 98.60 0.15 0.15 0.00 98.70 0.15 0.15 0.00 98.80 0.15 0.15 0.00 98.90 0.15 0.15 0.00 99.00 0.16 0.16 0.00 99.10 0.16 0.16 0.00 99.20 0.16 0.16 0.00 99.30 0.16 0.16 0.00 99.40 0.16 0.16 0.00 99.50 0.17 0.17 0.00 99.60 0.17 0.17 0.00 99.70 0.17 0.17 0.00 99.80 0.17 0.17 0.00 99.90 0.17 0.17 0.00 100.00 0.17 0.17 0.00 100.10 0.18 0.18 0.00 Elevation (feet) Discharge (cfs) Discarded (cfs) Primary (cfs) 100.20 0.18 0.18 0.00 100.30 0.18 0.18 0.00 100.40 0.18 0.18 0.00 100.50 0.18 0.18 0.00 100.60 0.19 0.19 0.00 100.70 0.19 0.19 0.00 100.80 0.19 0.19 0.00 100.90 1.18 0.19 0.99 101.00 2.98 0.19 2.79 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 125HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 2P: One (1) 36.0' x 12.0' x 6' Leach Chamber System Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 95.00 432 0 95.10 442 24 95.20 451 48 95.30 461 72 95.40 470 96 95.50 480 121 95.60 490 145 95.70 499 169 95.80 509 193 95.90 518 217 96.00 528 241 96.10 538 265 96.20 547 289 96.30 557 313 96.40 566 337 96.50 576 362 96.60 586 386 96.70 595 410 96.80 605 434 96.90 614 458 97.00 624 482 97.10 634 506 97.20 643 530 97.30 653 554 97.40 662 579 97.50 672 603 97.60 682 627 97.70 691 651 97.80 701 675 97.90 710 699 98.00 720 723 98.10 730 747 98.20 739 771 98.30 749 795 98.40 758 820 98.50 768 844 98.60 778 868 98.70 787 892 98.80 797 916 98.90 806 940 99.00 816 964 99.10 826 988 99.20 835 1,012 99.30 845 1,037 99.40 854 1,061 99.50 864 1,085 99.60 874 1,109 99.70 883 1,133 99.80 893 1,157 99.90 902 1,181 100.00 912 1,205 100.10 922 1,229 Elevation (feet) Wetted (sq-ft) Storage (cubic-feet) 100.20 931 1,253 100.30 941 1,278 100.40 950 1,302 100.50 960 1,326 100.60 970 1,350 100.70 979 1,374 100.80 989 1,398 100.90 998 1,422 101.00 1,008 1,446 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 126HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB1: Roof Leader - 6" ADS Pipe Inflow Area = 0.030 ac,100.00% Impervious, Inflow Depth = 8.26" for 100-Year event Inflow = 0.25 cfs @ 12.08 hrs, Volume= 0.021 af Outflow = 0.25 cfs @ 12.08 hrs, Volume= 0.021 af, Atten= 0%, Lag= 0.0 min Primary = 0.25 cfs @ 12.08 hrs, Volume= 0.021 af Routed to Pond 1P : One (1) 19.9' x 8.25' x 3' Leach Chamber System Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 105.17' @ 12.08 hrs Device Routing Invert Outlet Devices #1 Primary 105.00'6.0" Round Culvert X 4.00 L= 50.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 105.00' / 104.00' S= 0.0200 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.20 sf Primary OutFlow Max=0.25 cfs @ 12.08 hrs HW=105.17' TW=102.09' (Dynamic Tailwater) 1=Culvert (Inlet Controls 0.25 cfs @ 1.10 fps) Pond CB1: Roof Leader - 6" ADS Pipe Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.030 ac Peak Elev=105.17' 6.0" Round Culvert x 4.00 n=0.020 L=50.0' S=0.0200 '/' 0.25 cfs 0.25 cfs Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 127HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB1: Roof Leader - 6" ADS Pipe Primary Stage-Discharge Discharge (cfs) 10 El e v a t i o n ( f e e t ) 105.5 105.48 105.46 105.44 105.42 105.4 105.38 105.36 105.34 105.32 105.3 105.28 105.26 105.24 105.22 105.2 105.18 105.16 105.14 105.12 105.1 105.08 105.06 105.04 105.02 105 Culvert Pond CB1: Roof Leader - 6" ADS Pipe Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 105.5 105.48 105.46 105.44 105.42 105.4 105.38 105.36 105.34 105.32 105.3 105.28 105.26 105.24 105.22 105.2 105.18 105.16 105.14 105.12 105.1 105.08 105.06 105.04 105.02 105 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 128HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB1: Roof Leader - 6" ADS Pipe Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 105.00 0.00 0.50 0.00 105.00 0.00 1.00 0.00 105.01 0.00 1.50 0.00 105.01 0.00 2.00 0.00 105.01 0.00 2.50 0.00 105.02 0.00 3.00 0.00 105.02 0.00 3.50 0.00 105.02 0.00 4.00 0.00 105.02 0.00 4.50 0.00 105.02 0.00 5.00 0.00 105.02 0.00 5.50 0.00 105.02 0.00 6.00 0.00 105.02 0.00 6.50 0.00 105.02 0.00 7.00 0.01 105.02 0.01 7.50 0.01 105.03 0.01 8.00 0.01 105.03 0.01 8.50 0.01 105.03 0.01 9.00 0.01 105.03 0.01 9.50 0.01 105.03 0.01 10.00 0.01 105.04 0.01 10.50 0.02 105.04 0.02 11.00 0.02 105.04 0.02 11.50 0.03 105.06 0.03 12.00 0.16 105.13 0.16 12.50 0.05 105.07 0.05 13.00 0.02 105.05 0.02 13.50 0.02 105.04 0.02 14.00 0.01 105.04 0.01 14.50 0.01 105.04 0.01 15.00 0.01 105.03 0.01 15.50 0.01 105.03 0.01 16.00 0.01 105.03 0.01 16.50 0.01 105.03 0.01 17.00 0.01 105.03 0.01 17.50 0.00 105.02 0.00 18.00 0.00 105.02 0.00 18.50 0.00 105.02 0.00 19.00 0.00 105.02 0.00 19.50 0.00 105.02 0.00 20.00 0.00 105.02 0.00 20.50 0.00 105.02 0.00 21.00 0.00 105.02 0.00 21.50 0.00 105.02 0.00 22.00 0.00 105.02 0.00 22.50 0.00 105.02 0.00 23.00 0.00 105.02 0.00 23.50 0.00 105.02 0.00 24.00 0.00 105.02 0.00 24.50 0.00 105.00 0.00 25.00 0.00 105.00 0.00 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 129HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB1: Roof Leader - 6" ADS Pipe Elevation (feet) Primary (cfs) 105.00 0.00 105.01 0.00 105.02 0.00 105.03 0.01 105.04 0.01 105.05 0.02 105.06 0.03 105.07 0.05 105.08 0.06 105.09 0.08 105.10 0.10 105.11 0.11 105.12 0.13 105.13 0.16 105.14 0.18 105.15 0.21 105.16 0.23 105.17 0.26 105.18 0.29 105.19 0.32 105.20 0.35 105.21 0.39 105.22 0.42 105.23 0.45 105.24 0.49 105.25 0.53 105.26 0.57 105.27 0.60 105.28 0.64 105.29 0.68 105.30 0.72 105.31 0.77 105.32 0.81 105.33 0.85 105.34 0.89 105.35 0.93 105.36 0.98 105.37 1.02 105.38 1.06 105.39 1.10 105.40 1.15 105.41 1.19 105.42 1.23 105.43 1.27 105.44 1.31 105.45 1.34 105.46 1.38 105.47 1.41 105.48 1.44 105.49 1.47 105.50 1.49 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 130HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB1: Roof Leader - 6" ADS Pipe Elevation (feet) Storage (acre-feet) 105.00 0.000 105.01 0.000 105.02 0.000 105.03 0.000 105.04 0.000 105.05 0.000 105.06 0.000 105.07 0.000 105.08 0.000 105.09 0.000 105.10 0.000 105.11 0.000 105.12 0.000 105.13 0.000 105.14 0.000 105.15 0.000 105.16 0.000 105.17 0.000 105.18 0.000 105.19 0.000 105.20 0.000 105.21 0.000 105.22 0.000 105.23 0.000 105.24 0.000 105.25 0.000 105.26 0.000 105.27 0.000 105.28 0.000 105.29 0.000 105.30 0.000 105.31 0.000 105.32 0.000 105.33 0.000 105.34 0.000 105.35 0.000 105.36 0.000 105.37 0.000 105.38 0.000 105.39 0.000 105.40 0.000 105.41 0.000 105.42 0.000 105.43 0.000 105.44 0.000 105.45 0.000 105.46 0.000 105.47 0.000 105.48 0.000 105.49 0.000 105.50 0.000 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 131HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Summary for Pond CB2: Catch Basin At Lower Driveway Inflow Area = 0.240 ac, 0.00% Impervious, Inflow Depth = 3.48" for 100-Year event Inflow = 0.96 cfs @ 12.09 hrs, Volume= 0.070 af Outflow = 0.96 cfs @ 12.09 hrs, Volume= 0.070 af, Atten= 0%, Lag= 0.0 min Primary = 0.96 cfs @ 12.09 hrs, Volume= 0.070 af Routed to Pond 2P : One (1) 36.0' x 12.0' x 6' Leach Chamber System Routing by Dyn-Stor-Ind method, Time Span= 0.00-25.00 hrs, dt= 0.01 hrs Peak Elev= 105.89' @ 12.09 hrs Device Routing Invert Outlet Devices #1 Primary 105.50'12.0" Round Catch Basin X 2.00 L= 50.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 105.50' / 102.50' S= 0.0600 '/' Cc= 0.900 n= 0.020 Corrugated PE, corrugated interior, Flow Area= 0.79 sf Primary OutFlow Max=0.96 cfs @ 12.09 hrs HW=105.89' TW=96.71' (Dynamic Tailwater) 1=Catch Basin (Inlet Controls 0.96 cfs @ 1.68 fps) Pond CB2: Catch Basin At Lower Driveway Inflow Primary Hydrograph Time (hours) 252423222120191817161514131211109876543210 Fl o w ( c f s ) 1 0 Inflow Area=0.240 ac Peak Elev=105.89' 12.0" Round Culvert x 2.00 n=0.020 L=50.0' S=0.0600 '/' 0.96 cfs 0.96 cfs Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 132HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Pond CB2: Catch Basin At Lower Driveway Primary Stage-Discharge Discharge (cfs) 43210 El e v a t i o n ( f e e t ) 106 Catch Basin Pond CB2: Catch Basin At Lower Driveway Storage Stage-Area-Storage Storage (acre-feet) 0 El e v a t i o n ( f e e t ) 106 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 133HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Hydrograph for Pond CB2: Catch Basin At Lower Driveway Time (hours) Inflow (cfs) Elevation (feet) Primary (cfs) 0.00 0.00 105.50 0.00 0.50 0.00 105.50 0.00 1.00 0.00 105.50 0.00 1.50 0.00 105.50 0.00 2.00 0.00 105.50 0.00 2.50 0.00 105.50 0.00 3.00 0.00 105.50 0.00 3.50 0.00 105.50 0.00 4.00 0.00 105.50 0.00 4.50 0.00 105.50 0.00 5.00 0.00 105.50 0.00 5.50 0.00 105.50 0.00 6.00 0.00 105.50 0.00 6.50 0.00 105.50 0.00 7.00 0.00 105.50 0.00 7.50 0.00 105.50 0.00 8.00 0.00 105.50 0.00 8.50 0.00 105.50 0.00 9.00 0.00 105.50 0.00 9.50 0.00 105.50 0.00 10.00 0.00 105.52 0.00 10.50 0.01 105.54 0.01 11.00 0.02 105.56 0.02 11.50 0.05 105.59 0.05 12.00 0.52 105.78 0.52 12.50 0.25 105.69 0.25 13.00 0.11 105.63 0.11 13.50 0.09 105.61 0.09 14.00 0.07 105.60 0.07 14.50 0.06 105.59 0.06 15.00 0.05 105.59 0.05 15.50 0.05 105.58 0.05 16.00 0.04 105.57 0.04 16.50 0.03 105.57 0.03 17.00 0.03 105.57 0.03 17.50 0.03 105.56 0.03 18.00 0.02 105.56 0.02 18.50 0.02 105.56 0.02 19.00 0.02 105.56 0.02 19.50 0.02 105.55 0.02 20.00 0.02 105.55 0.02 20.50 0.02 105.55 0.02 21.00 0.02 105.55 0.02 21.50 0.02 105.55 0.02 22.00 0.02 105.55 0.02 22.50 0.02 105.55 0.02 23.00 0.01 105.55 0.01 23.50 0.01 105.54 0.01 24.00 0.01 105.54 0.01 24.50 0.00 105.50 0.00 25.00 0.00 105.50 0.00 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 134HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Discharge for Pond CB2: Catch Basin At Lower Driveway Elevation (feet) Primary (cfs) 105.50 0.00 105.51 0.00 105.52 0.00 105.53 0.01 105.54 0.01 105.55 0.02 105.56 0.03 105.57 0.03 105.58 0.04 105.59 0.06 105.60 0.07 105.61 0.08 105.62 0.10 105.63 0.12 105.64 0.13 105.65 0.15 105.66 0.17 105.67 0.20 105.68 0.22 105.69 0.24 105.70 0.27 105.71 0.30 105.72 0.32 105.73 0.35 105.74 0.38 105.75 0.41 105.76 0.44 105.77 0.48 105.78 0.51 105.79 0.55 105.80 0.58 105.81 0.62 105.82 0.66 105.83 0.70 105.84 0.74 105.85 0.78 105.86 0.82 105.87 0.86 105.88 0.91 105.89 0.95 105.90 1.00 105.91 1.04 105.92 1.09 105.93 1.14 105.94 1.19 105.95 1.24 105.96 1.29 105.97 1.34 105.98 1.39 105.99 1.44 106.00 1.49 106.01 1.55 Elevation (feet) Primary (cfs) 106.02 1.60 106.03 1.65 106.04 1.71 106.05 1.76 106.06 1.82 106.07 1.88 106.08 1.93 106.09 1.99 106.10 2.05 106.11 2.11 106.12 2.17 106.13 2.22 106.14 2.28 106.15 2.34 106.16 2.40 106.17 2.46 106.18 2.52 106.19 2.58 106.20 2.64 106.21 2.70 106.22 2.76 106.23 2.82 106.24 2.88 106.25 2.94 106.26 3.00 106.27 3.06 106.28 3.12 106.29 3.18 106.30 3.24 106.31 3.30 106.32 3.36 106.33 3.41 106.34 3.47 106.35 3.53 106.36 3.58 106.37 3.64 106.38 3.69 106.39 3.74 106.40 3.80 106.41 3.85 106.42 3.90 106.43 3.95 106.44 3.99 106.45 4.04 106.46 4.08 106.47 4.12 106.48 4.16 106.49 4.19 106.50 4.22 Type III 24-hr 100-Year Rainfall=8.50"9349.736 Long Pond Road - EASTWARD HOMES - VA Printed 1/24/2023Prepared by J M O'Reilly & Associates Inc Page 135HydroCAD® 10.20-2g s/n 08678 © 2022 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond CB2: Catch Basin At Lower Driveway Elevation (feet) Storage (acre-feet) 105.50 0.000 105.51 0.000 105.52 0.000 105.53 0.000 105.54 0.000 105.55 0.000 105.56 0.000 105.57 0.000 105.58 0.000 105.59 0.000 105.60 0.000 105.61 0.000 105.62 0.000 105.63 0.000 105.64 0.000 105.65 0.000 105.66 0.000 105.67 0.000 105.68 0.000 105.69 0.000 105.70 0.000 105.71 0.000 105.72 0.000 105.73 0.000 105.74 0.000 105.75 0.000 105.76 0.000 105.77 0.000 105.78 0.000 105.79 0.000 105.80 0.000 105.81 0.000 105.82 0.000 105.83 0.000 105.84 0.000 105.85 0.000 105.86 0.000 105.87 0.000 105.88 0.000 105.89 0.000 105.90 0.000 105.91 0.000 105.92 0.000 105.93 0.000 105.94 0.000 105.95 0.000 105.96 0.000 105.97 0.000 105.98 0.000 105.99 0.000 106.00 0.000 106.01 0.000 Elevation (feet) Storage (acre-feet) 106.02 0.000 106.03 0.000 106.04 0.000 106.05 0.000 106.06 0.000 106.07 0.000 106.08 0.000 106.09 0.000 106.10 0.000 106.11 0.000 106.12 0.000 106.13 0.000 106.14 0.000 106.15 0.000 106.16 0.000 106.17 0.000 106.18 0.000 106.19 0.000 106.20 0.000 106.21 0.000 106.22 0.000 106.23 0.000 106.24 0.000 106.25 0.000 106.26 0.000 106.27 0.000 106.28 0.000 106.29 0.000 106.30 0.000 106.31 0.000 106.32 0.000 106.33 0.000 106.34 0.000 106.35 0.000 106.36 0.000 106.37 0.000 106.38 0.000 106.39 0.000 106.40 0.000 106.41 0.000 106.42 0.000 106.43 0.000 106.44 0.000 106.45 0.000 106.46 0.000 106.47 0.000 106.48 0.000 106.49 0.000 106.50 0.000 DRAFT MEETING MINUTES DATED JANUARY 25, 2023 AND FEBRUARY 8, 2023 PB Minutes 01/25/23 Page 1 of 5 Brewster Planning Board 2198 Main Street Brewster, MA 02631-1898 (508) 896-3701 x1133 brewplan@brewster-ma.gov BREWSTER PLANNING BOARD MEETING MINUTES Wednesday, January 25, 2023 at 6:30 pm Brewster Town Office Building (virtual) Chair Madalyn Hillis-Dineen convened a remote meeting of the Planning Board at 6:30 pm with the following members participating remotely: Amanda Bebrin, Charlotte Degen, Tony Freitas, Rob Michaels, Elizabeth Taylor, and Alex Wentworth. Also participating remotely: Jon Idman, Town Planner, Lynn St. Cyr, Senior Department Assistant, and Donna Kalinick, Assistant Town Manager. Pursuant to Chapter 107 of the Acts of 2022, this meeting will be conducted in person and via remote means, in accordance with applicable law. This means that members of the public body may access this meeting in person, or via virtual means. In person attendance will be at the meeting location listed above, and it is possible that any or all members of the public body may attend remotely. No in-person attendance of members of the public will be permitted, and public participation in any public hearing conducted during this meeting shall be by remote means only. The meeting will be broadcast live, in real time, via Live broadcast (Brewster Government TV Channel 18), Livestream (livestream.brewster-ma.gov), or Video recording (tv.brewster-ma.gov). The Planning Board packet can be found on the Planning Department page on the Town of Brewster website (www.brewster-ma.gov). Hillis-Dineen declared that a quorum of the Planning Board was present. 6:31 PM CITIZEN’S FORUM No citizen comments. 6:36 PM PUBLIC MEETING Comprehensive Permit Application per MGL Chapter 40B, Sections 20-23, Millstone Road Affordable Housing Development (Assessors Map 98 Parcel 12). Documents: 11/18/22 Staff Review Report 12/22/22 Comprehensive Permit Application including 12/20/22 Plan set 01/19/23 Staff Report Bebrin recused herself from the review as she is an abutter to the project. The following individuals participated remotely: Peter Freeman, Freeman Law Group LLC; David Quinn, Director of Housing Development and Planning, Housing Assistance Corporation (HAC); Brian Kuchar, Associate Principal, Registered Landscape Architect and Professional Engineer, Horsley Witten Group; Joe Henderson, Senior Engineer, Horsley Witten Group; Paul Attemann, Principal and Licensed Professional Architect, Union Studio; Vitalia Shklovsky, Senior Project Manager, Preservation of Affordable Housing (POAH), and Jamie Carroll, Development Associate, POAH. Freeman introduced the team presenting on behalf of the Applicants POAH and HAC. Quinn began the presentation stating that the proposed development includes 45 units on Town owned land. POAH and HAC have worked together previously including on the Brewster Woods project. Horsley Witten Group is part of the development team and Approved: Vote: PB Minutes 01/25/23 Page 2 of 5 working as civil engineers and landscape architects. Union Studio is also part of the development team handling architecture. The 40B Comprehensive Permit application has been filed with the Zoning Board of Appeals (ZBA). Attemann described the site as unusual in shape. The site is very long and narrow. The site has very little frontage on Millstone Road. The site is very wooded and is bordered by single family residences on the east side. There is also a small development to the south. There is also a community just north of the property. Attemann described the site as relatively flat as you enter from Millstone Road but then as you get to the center of the site it drops down quite a bit. There is a steeper grade on the south and west side making those areas more difficult to develop. To the west of the developable area will be the septic and to the south there will be stormwater infrastructure. Henderson stated that the project will connect to Millstone Road on the east side and the team will be coordinating with the proposed Millstone Road improvements. The project meets all setbacks except for a slight encroachment on the southern portion of the site. The stormwater management plan includes bioretention areas for water quality treatment. All stormwater runoff will be managed on site up to a 100-year storm event. Utilities including water and electric are coming into the site from Millstone Road. The wastewater system will be on the western portion of the site. It will be an innovative alternative treatment system that meets the Board of Health nitrogen loading requirements. There will be an underground leaching system. Stormwater and wastewater soil testing has been completed and well-drained soil was found throughout the site with no indication of groundwater. Kuchar stated that one of the goals of the project was to minimize site disturbance and maintain as much of the tree canopy in the existing woodland as possible. The site consists mostly of pitch pine and oak. Additional plantings will be added including more oak, black locust, elm, eastern red cedar, and white pine. These plantings were chosen for color and screening of the site. The plantings will be incorporated into the stormwater management approach. There are two sustainable seed mixes proposed for the site which require less mowing. Attemann stated that there are 11 buildings proposed with 10 residences and 1 community building. The community building houses a community room, small kitchenette, bathrooms, management office, common laundry, and tenant storage in the basement. The total number of units proposed is 45 and includes 1, 2, and 3-bedrooms units. Attemann reviewed the proposed designs for the buildings. Freeman stated that the Applicants met with town staff for an informal staff review. The Applicants believe they have met the goals of the Town’s RFP. Michaels asked for clarification on green infrastructure and asked whether energy efficiency was discussed anywhere in the submission. Henderson responded that green infrastructure includes above ground bioretention systems using passive treatment. Henderson explained that typically shallow depressions are planted with plants and there is a bioretention soil media that filters the stormwater for treatment. The filtered stormwater would be directed to an underground chamber system. The stormwater is being treated through the bioretention systems and larger storms are managed through underground infiltration type systems. Quinn discussed energy efficiency. It is the intention of the Applicant to target the passive house energy efficiency certification and that will be reviewed as the more detailed construction design progresses but there is a cost component that will need to be considered. Taylor asked what energy systems were being used in the project and whether solar would be included in the project. Attemann stated that electrical heat pumps will be used and the goal is to also include solar. The buildings are oriented well for solar. Taylor asked if the Town would be putting solar on the roofs. Kalinick responded that this will be a long- term lease between the Town and the Applicants and the Town will not be putting solar on the roofs. The RFP did request LEED certification or passive housing standards. Kalinick further stated that there are grants available through Cape Light Compact for new affordable housing construction. Financing around these projects is very complex and the Applicants are not committing right now to an end product. Kalinick noted that the goal of both the Applicant and the Housing Trust is for high energy efficiency but right now the Applicant cannot commit 100% to what the end product will be. PB Minutes 01/25/23 Page 3 of 5 Taylor inquired about the seed mix being used on site and whether the green area to the back of the site would be under conservation restriction. Freeman responded that a conservation restriction was not part of the RFP. Taylor stated that she wanted to ensure that the area was not developed or encroached upon by gardens or in other ways. She also asked whether community gardens were planned at the site. Kuchar responded that a sustainable seed mix will be used so less mowing will be needed. There are no community gardens planned yet. Quinn stated that there is space available for recreation and community amenities. Quinn further stated that the available space is for use by the residents. There is no plan for public community gardens. Degen asked for clarification on the “passive house” rating and for further details on the septic system proposed. Shklovsky stated that passive house is focused on not using fossil fuels as well as the air quality as it relates to the building envelope. Solar panels would be considered a bonus to enhance the electric power. Henderson provided details on the septic system. He stated that each building would have a gravity collection system that would contribute to a common sewer collection system. It will be an innovative alternative system with a nitrogen reducing component which will lead to an underground disposal system. Freitas asked for more information on the site stop ratio addressed in the due diligence report provided by the Applicant. Henderson responded that the Applicant has hired a traffic engineer to review such things as site and stopping distances as part of a traffic analysis. Shklovsky stated that a traffic study is being prepared and once completed it will be provided. Freitas stated that the due diligence report noted a possible need for more clearing for site distance and the Applicant may want to review that further especially since town improvements are proposed for Millstone Road. Freeman stated that there have been preliminary discussions between town staff, including the DPW, about the Millstone Road improvements and the Applicant will coordinate with staff on the proposed work. Wentworth inquired about the tree and brush clearing. He asked who was responsible for oversight to ensure that the buffer to the abutters is maintained. Kuchar responded that the site will be staked to show the limit of clearing. Wentworth asked if staff would be overseeing the clearing. Kalinick stated that for past projects she and Housing Coordinator Jill Scalise have walked the site with the development team to review the limit of clearing. She expects a similar approach will take place with this project. Wentworth asked if local preference would be given to individual and families. Kalinick stated that local preference is not part of permitting. The Select Board with consultation from the Housing Partnership and the Affordable Housing Trust is the board that would make the request for local preference to the Department of Housing and Community Development. Wentworth asked whether the Applicant would need to apply for a major stormwater permit. Idman stated that the Applicant has not applied for a waiver from the stormwater bylaw. The ZBA would be the board overseeing the stormwater permit application as part of the comprehensive permit process. The Applicant has already tried to manage stormwater issues in the landscape plan. Hillis-Dineen stated she hoped that the Applicant would pursue grants to provide solar panels. Hillis-Dineen also stated that she hoped there would be more laundry facilities and not just the ones provided in the community center. Shklovsky responded that appropriate laundry facilities would be provided. Kalinick stated that research on available grants would be needed to help with solar panel costs. Taylor asked who would be managing and maintaining the I/A system. Henderson responded that a third party would be hired to maintain the system. Freeman stated that overall management would be handled by POAH. Shklovsky stated that POAH will be handling management of the development long-term. Michaels asked if the Applicant would need to upgrade the septic if septic laws changed. Idman responded that if septic laws change, they will pertain to nitrogen sensitives areas and this project is not located in such an area. Michaels asked about the footpaths throughout the site and wondered if the Applicant had considered creating footpaths through the woodlands. Kuchar stated that existing paths would remain if they were not within the disturbed area. The Applicant would prefer to see how residents use the facilities before deciding on new footpaths. Idman stated that the Applicant has no control over the land not proposed to be developed. The land may be under the control of the Select Board and footpaths should be discussed with the Select Board. Kalinick noted that as part of the Millstone Road reconstruction project there will be a PB Minutes 01/25/23 Page 4 of 5 crosswalk very close to this area with the intention that people will use it to get to Nickerson State Park. She stated that town staff have met with utility companies to coordinate the needs of this project so that once reconstructed Millstone Road does not need to be reopened. Idman noted the waivers the Applicant requested including the size of the parking spaces and waiver of site plan review applicability. He stated that although a waiver for the applicability of site plan review was sought, it appears the Applicant has met most of the site plan review standards. He reminded the Planning Board that their recommendation to the ZBA should include a recommendation related to the waivers. Taylor suggested the Planning Board discuss the waiver requests. She stated that waiving the size of the parking spaces could be a problem as cars are not getting smaller. Idman stated that Millstone Road is designated as a scenic road. When tree clearing is proposed as part of roadwork on a scenic road the Planning Board along with the Tree Warden are tasked with holding a public hearing. Idman stated that the Planning Board could consider a waiver for the tree hearing. The waiver sought for parking space size requests spaces at 9x18’ rather than the 10x20’ requirement. Idman stated that the Applicant could be requesting a waiver to parking space size because they are trying to minimize the development footprint as much as practicable. Freeman stated that he believes the size of the spaces are adequate and allow for less development impact. Attemann stated that the parking spaces were proposed at this size to reduce the amount of impervious area and runoff. Attemann stated that the 9x18’ space is standard and serves average size cars. Kuchar agreed with Attemann and noted that the spaces were proposed at this size to reduce impervious area, reduce the heat island effect, and create a tighter development. Michaels stated that smaller spaces are better from a water management view. Michaels stated that according to his research, the norm for parking space size around the United States is 7.5-9’ x 16-20’. Michaels asked the Applicant to address the side yard setback on the southerly side. He stated that he believes the abutting land is undeveloped and part of Captains Village. Freeman responded that there is an encroachment to the setback on the southerly side but the Applicant is in compliance with all other yard setbacks. The encroachment is not close to any houses and does not seem to have any negative impact. Henderson agreed with Freeman and stated that in that area of the site the required 25’ setback is not met as the Applicant proposed 18’. Kuchar noted that there is a 10’ vegetative buffer in this area which the Applicant proposed to keep intact. Idman stated that the southerly abutter is a cluster subdivision and the immediate abutting lot is open space not proposed for development. Taylor asked about the removal of invasive species and whether machines or pesticides would be used during the removal process. She also asked for clarification on the Planning Board’s role in reviewing this project. Idman stated that the waivers requested by the Applicant would be reviewed by the ZBA and the ZBA would make a decision on the waivers not the Planning Board. The Planning Board’s role is to provide recommendations to the ZBA to assist them in their review of the project. The Planning Board’s recommendations are not binding on the ZBA. Kuchar responded that there are minimal invasives on site and their removal will be done manually with no pesticide use proposed. Degen expressed concern about the smaller sized parking spaces. Hillis-Dineen responded that she researched parking space sizes and found that 7.9-9’ wide spaces were common. Hillis-Dineen stated that she did not think the reduced size of the parking space would be an issue. Idman reminded the Planning Board that they have a parking policy that allows for several types of waivers including size of spaces and number of spaces. Motion by Freitas to Recommend the Comprehensive Permit Application for the Millstone Road Affordable Housing Development to the Zoning Board of Appeals with the Requested Waivers that would otherwise be in the Purview of the Planning Board. Second by Michaels. Roll call vote: Freitas-yes; Michaels-yes; Wentworth-yes; Degen-yes; Taylor- yes; and Hillis-Dineen-yes. Vote: 6-0-0. 7:55 PM PLANNING DISCUSSION 2022 Planning Board Annual Report. Documents: Draft 2022 Planning Board Annual Report PB Minutes 01/25/23 Page 5 of 5 Bebrin rejoined the Planning Board meeting. The Planning Board reviewed and discussed the draft 2022 Planning Board Annual Report. Motion by Michaels to Approve the 2022 Planning Board Annual Report. Second by Taylor. Roll call vote: Michaels- yes; Wentworth-yes; Degen-yes; Taylor-yes; Bebrin-yes; Freitas-yes; and Hillis-Dineen-yes. Vote: 7-0-0. 7:59 PM PLANNING DISCUSSION CONTINUED Review and discuss Select Board policy on meeting format change effective March 1, 2023. Documents: 12/21/22 Email from Erika Mawn including Select Board Remote Participation Policy amended 06/10/22 The Planning Board discussed upcoming changes to the meeting format. Degen stated that it was hard to visualize how a hybrid meeting would work and wondered if it would be confusing for both board members and the public. Bebrin discussed her experience with hybrid meetings as a member of both the Bay Parcel Planning Committee and the Vision Planning Committee. Kalinick noted that the remote participation policy does not address whether presenters are required to be in person. Michaels stated that he is ready to return to in person meetings and he thinks it is a good option for the public to be able to participate via Zoom. Taylor stated that she can hear people better on Zoom. When meetings are in person, speakers do not always use their microphone. Hillis-Dineen agreed with Taylor but stated she is happy to come back in person. Wentworth stated that he would be happy to be back in person as well and thinks that all presenters should also participate in person. 8:12 PM PLANNING DISCUSSION CONTINUED Approval of Meeting Minutes: December 14, 2022. The Board reviewed the December 14, 2022 meeting minutes. Motion by Degen to Approve December 14, 2022 Meeting Minutes, as amended. Second by Michaels. Roll call vote: Michaels-yes; Wentworth-yes; Degen-yes; Taylor- yes; Bebrin-yes; Freitas-yes; Hillis-Dineen-yes. Vote: 7-0-0. 8:16 PM COMMITTEE REPORTS Michaels attended a Water Quality Review Committee (WQRC) meeting and there was discussion on projects on Freeman’s Way and industrial activity in Zone II. Wentworth stated that the Vision Planning Committee (VPC) has been on hold but will be meeting in February. Degen reported on a recent Select Board meeting that included the Bay Property Planning Committee’s efforts on a public pool, Select Board open office hours, a Citizen’s petition related to use of Town Funds for the Wing Island board walk and Drummer Boy Park as well as a conservation restriction, boardwalk designs, and a report of the financial plan for affordable housing. Taylor stated that the Community Preservation Committee (CPC) anticipates a lot of applications coming in and looks forward to funds from the Town and the State. Motion by Bebrin to Adjourn. Second by Taylor. Roll call vote: Michaels-yes; Wentworth-yes; Degen-yes; Taylor-yes; Bebrin-yes; Freitas-yes; and Hillis-Dineen-yes. Vote: 7-0-0. Meeting adjourned at 8:23 PM. Next Planning Board Meeting Date: February 8, 2023. Respectfully submitted, __________________________________________ Lynn St. Cyr, Senior Department Assistant, Planning PB Minutes 02/08/23 Page 1 of 3 Brewster Planning Board 2198 Main Street Brewster, MA 02631-1898 (508) 896-3701 x1133 brewplan@brewster-ma.gov BREWSTER PLANNING BOARD MEETING MINUTES Wednesday, February 8, 2023 at 6:30 pm Brewster Town Office Building (virtual) Chair Madalyn Hillis-Dineen convened a remote meeting of the Planning Board at 6:30 pm with the following members participating remotely: Amanda Bebrin, Tony Freitas, Rob Michaels, Elizabeth Taylor, and Alex Wentworth. Charlotte Degen did not participate. Also participating remotely: Jon Idman, Town Planner, and Lynn St. Cyr, Senior Department Assistant. Pursuant to Chapter 20 of the Acts of 2021, this meeting will be conducted in person and via remote means, in accordance with applicable law. This means that members of the public body may access this meeting in person, or via virtual means. In person attendance will be at the meeting location listed above, and it is possible that any or all members of the public body may attend remotely. No in-person attendance of members of the public will be permitted, and public participation in any public hearing conducted during this meeting shall be by remote means only. The meeting will be broadcast live, in real time, via Live broadcast (Brewster Government TV Channel 18), Livestream (livestream.brewster-ma.gov), or Video recording (tv.brewster-ma.gov). The Planning Board packet can be found on the Planning Department page on the Town of Brewster website (www.brewster-ma.gov). Hillis-Dineen declared that a quorum of the Planning Board was present. 6:33 PM CITIZEN’S FORUM Glenn Casey, 288 Fletcher Lane, addressed the Planning Board regarding the proposed Millstone Road Affordable Housing Development. He stated that it is a myth that there is an urgent need for affordable housing in Brewster. Casey stated that for Serenity and Brewster Woods most of the housing applicants came from off Cape. He urged local boards to look at the project costs and ask the applicants to review the costs due to inflation and supply chain issues. 6:39 PM PUBLIC MEETING Approval Not Required, Case No. 2023-01: Applicants/Owners: Duane Doolittle and Cristian O. Diaz Avalo through their representative Donald T. Poole, P.L.S. of Outermost Land Survey, Inc., seek endorsement of an Approval Not Required Plan for property located at 8 White Oak Trail and 7 and 9 Thousand Oaks Drive and shown on Tax Map 107, Parcels 20 and 21 respectively, within the Residential Low Density (R-L) Zoning District. The plan is pursuant to MGL c. 41 §81L and §81P and §290-4 of the Brewster Subdivision Rules and Regulations. Documents: 01/20/23 Approval Not Required application including plans dated 09/20/22 01/31/23 Staff Report Don Poole participated remotely on behalf of the Applicants. Poole stated that the plan proposes an equal area land swap. He stated that the properties conform to zoning and have sufficient frontage. He requested endorsement of two plans as one will need to be filed with the Land Court and the other with the Registry of Deeds. Michaels asked whether the new lot lines would require the property owners to obtain variances for the existing sheds. Poole responded that Approved: Vote: PB Minutes 02/08/23 Page 2 of 3 the shed on the west property complies with setbacks. He also stated that there are two sheds on the property to the east and one of the two sheds may need to be relocated to comply with setbacks. Bebrin stated that the point of the review is to determine if the lots have adequate frontage and both proposed lots do have adequate frontage. Motion by Taylor to Endorse Approval Not Required, Case No. 2023-01. Second by Bebrin. Roll call vote: Freitas-yes; Michaels-yes; Wentworth-yes; Taylor-yes; Bebrin-yes; and Hillis-Dineen-yes. Vote: 6-0-0. 6:45 PM PUBLIC MEETING CONTINUED Major Stormwater Management Permit, Case No. 2023-01: Applicant/Owner: Lisa Mullin through her representative John M. O’Reilly, P.E., P.L.S. of J.M. O’Reilly & Associates, Inc., has submitted an application for property located at Tubman Road, Lot 3 on Plan Book 698, Page 11 and formerly shown as part of Tax Map 55, Parcel 142. The Applicant seeks a major stormwater management permit to construct a single-family dwelling and supporting improvements pursuant to Brewster Town Code Chapter 272 and its accompanying Regulations. Documents: 01/26/23 Stormwater Management Permit Application including plans dated 01/24/23 01/27/23 Stormwater Management Report and Operations & Maintenance Manual including 01/24/23 HydroCAD Report 01/31/23 Staff Report 02/01/23 Letter from John O’Reilly John O’Reilly participated remotely on behalf of the Applicant Lisa Mullin. The Applicant was also present. O’Reilly stated that the Applicant is seeking a major stormwater management permit to construct a single-family dwelling. The building will be 1100 SF with 18000 SF of vacant land on Tubman Road being disturbed. The lot slopes toward Tubman Road from about the midpoint. A paved driveway will be constructed up to a graded area where the house will be built into the hillside. The roof runoff will be handled through gutters, downspouts, and a drywell sized for a 100-year storm. The rest of the runoff will be captured through a grassed channel on the northside of the driveway and a solid catch basin with subsurface leaching facility. A waiver from the phosphorous requirement has been requested. Michaels asked what best management practices (BMP) would be used to address total phosphate. O’Reilly responded that phosphorous could be addressed through a vegetated swale or basin, retention pond, or constructed wetland. For the Applicant’s property, it will be addressed somewhat by a deep sump catch basin which will have a hood for TSS reduction as well. Michaels asked if a bioswale was being used as a BMP. O’Reilly responded that no bioswale was proposed because the lot climbs quickly from the road and more disturbance would be needed to create a level area for a swale. O’Reilly further stated that water will run through the grass channel so there will be uptake of some nutrients and suspended solids. Motion by Michaels to Approve Major Stormwater Management Permit, Case No. 2023-01 with Requested Waiver, subject to the Conditions Required by the Stormwater Management Regulations. Second by Bebrin. Roll call vote: Freitas-yes; Michaels-yes; Wentworth-yes; Taylor-yes; Bebrin-yes; and Hillis-Dineen-yes. Vote: 6-0-0. 6:54 PM FOR YOUR INFORMATION The Planning Board discussed information they received on upcoming workshops through the Lower Cape Housing Institute, public hearings on zoning amendments, and the Citizen Planner Training Collaborative conference. 6:56 PM COMMITTEE REPORTS Bebrin stated that the Vision Planning Committee is on a hiatus and will resume meeting after the Spring Town Meeting to work on the Local Comprehensive Plan to hopefully bring it to Fall Town Meeting. Taylor stated that the Community Preservation Committee voted to support three housing applications in Dennis, Wellfleet, and Orleans. Taylor stated that she wished Brewster would apply to other local towns for support with housing. Hillis-Dineen stated that there are several programs available to residents to help make home more affordable and urged people to contact the Housing PB Minutes 02/08/23 Page 3 of 3 Office for more information. Michaels stated that the Water Quality Review Committee has been reviewing a property off of Freeman’s Way where remediation work is taking place in order to construct a solar array. Bebrin, a member of the Bay Parcel Planning Committee, announced that First Light Beach would be open beginning Memorial Day Weekend. The beach will be open on weekends until mid-June at which point it will be open 7 days per week. Work is also taking place on the pool to get it ready to open this summer hopefully right before July 4th weekend. The pool and the beach are expected to open at 7 am. Hillis-Dineen stated that the Brewster Affordable Housing trust recently held a meeting and discussed renovations to a house so that it may remain on the housing inventory and be sold. The Millstone Road Affordable Housing Development was also discussed. 7:04 PM FOR YOUR INFORMATION CONTINUED Hillis-Dineen announced that the Citizen Planner Training Collaborative’s Annual Conference was on March 18th. Motion by Bebrin to Adjourn. Second by Michaels. Roll call vote: Freitas-yes; Michaels-yes; Wentworth-yes; Taylor- yes; Bebrin-yes; and Hillis-Dineen-yes. Vote: 6-0-0. Meeting adjourned at 7:07 PM. Next Planning Board Meeting Date: February 22, 2023 Respectfully submitted, __________________________________________ Lynn St. Cyr, Senior Department Assistant, Planning FOR YOUR INFORMATION Town of Brewster 2198 Main Street Brewster, MA 02631-1898 Phone: (508) 896-3701 Fax: (508) 896-8089 MEMORANDUM TO: Brewster Boards & Committees FROM: Donna J. Kalinick, Assistant Town Manager RE: Recent Lottery Information DATE: February 15, 2023 As discussed at the last ZBA hearing, the Select Board has purview over the request to the Department of Housing and Community Development (DHCD) regarding Local Preference. The Select Board on behalf of the Town can ask for up to 70% which requires justification and approval by DHCD. It should be noted that Local Preference is only for people who live in Brewster, work in Brewster, including employment at the municipality or have kids in the schools that are located in Brewster. In order to provide clarity around the recent affordable housing lotteries that took place for Brewster Woods and Serenity Brewster, I have compiled the following information, based on lottery data provided by Housing Assistance Corporation who was the lottery agent for both lotteries. The backup data is not included because it includes personal information of the applicants. Brewster Woods: 30 units of affordable rental housing at 30 to 60% of the Area Median Income (AMI) and one unit at 80% of the AMI; 3 of the units were not included in the lottery because they were specific to adults transitioning to independent living. Brewster Woods had a 70% Local Preference for the lottery which was 21 units. For the 27 units that were available for the lottery, there were 128 qualified applicants and another 112 applicants that were not qualified, a total of 240 applications. Of the 128 applicants, 40 were in the local preference pool for 21 units. 64 applicants were from other towns on Cape Cod; 24 were from off-Cape, of those, 4 were from out of state. 81% of the applicants were from on-Cape towns, including those who qualified for the local preference pool. Of the 112 non-qualified applicants, 89 were from Cape Cod towns and 23 were from off-Cape, with 2 from out of state. 80% were from Cape Cod towns. Office of: Town Manager Housing Serenity: 27 Affordable units, age 55 and up in the lottery at up to 80% AMI. Serenity had 50% Local preference for the 27 units or 14 units. There were 53 qualified applicants and another 19 applicants that were not qualified. A total of 72 applicants. For the 27 units that were available for the lottery, 14 were in the local preference pool, 27 were from other towns on-Cape; 13 from off-Cape, 4 of those were from out of state. 81% of the applicants were from on-Cape towns, including those who qualified for the local preference pool. Of the 19 non-qualified applicants, 15 were from on-Cape towns, 3 were from off-Cape and 1 was not identified. 80% were from on-Cape towns. We are keenly aware that due to the rising cost of housing and the lack of available rentals in Brewster, many residents have been forced to leave Brewster and locate either in another Cape town or off-Cape. Furthermore, we recognize that the need for housing is a regional problem.