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MSD Stormwater Regulations Fall 2010 (PDF)MSD Stormwater RegulationsFall 2010 UpdateJohn Grimm, P.E. – Principal Engineer, Development Reviewwww.stlmsd.com What is the problem?Too Much Imperviousness →Too Much Runoff →Unstable Watersheds Chronic Pollutant Loads intoUrban Watersheds Pollutants from a paved parking lot •Begin stormwater management early in the site development process•LID, LEED, Storm Water Phase II Regulations •Less sewers, less curbs, less hard surfaces, less runoff•More green space, more swales, more natural features, more native vegetationNew Design Methods…..Let’s Change “Business as Usual”…We Haveto 6 r ..I ii. ll 1- 1: I1 ie L • 4 . ::,... -../ 4 , i ." j• - . • • ' • •• ' rt.': J • • . • • .... • • : _ A. ,A • .......5.0 'L • V I • 1 • .:-,....."' ••••• . el '•.- • ' ' f' - ., .. . ' ?..77. --."4'..i. • ' . • • . V r-L 1 ..1 - . 'IlY t • r.., . . ) ""•;:. 1:-• -- rr : . -.1 - - '11: ' : - I . ' .3'5 ...•••• 4.1. l'- 0.-i• r fir ..• . • ..,. or .. .. . . .. . I-, .r.4....: ar..-.-•_.''../...._ • 1.: • "" r0. • -.-i•r • './ ..— 1.1J . .0..4pi ..a - ,/' ..111• • '4km.,. ' .. 1:* 1.., -t `"4? 11.,1 .•.. I ' -• 4141..'. . j‘.iei.:,'PIP. ./.:4.I k e ,s1'I9. .I ..'''. • 1- ),; , : ,_ii .1.f d ' J 4l , - % MSD Approved as Plan Area Coordinating AuthorityTriggered at One Acre of DisturbanceCooperation Achieved Between61 Copermittees •5-Year Plan•6 Minimum Control Measures•General Permit•Annual ReportingStorm Water Management Plan THE METROPOLITAN ST. LOUIS SEWER DISTRICT RULES AND REGULATIONS AND ENGINEERING DESIGN REQUIREMENTS FOR SANITARY SEWER AND STORMWATER DRAINAGE FACILITIES FEBRUARY 2006 ad 11.1 mr 11.V 1.1 1.1' 11.% "iai 1".1 a1 11.1 1�11".1 lar 0.% ar ea Pr IF " Ter; 2000 M ARYLAND STORMWATER DyS-yIGNIM ANUAL V OLUMES I & II PREPARED BY: OCCO MCAT C ,runINm AND THE { M ARYLAND DEPARThEF T OF THE ENVIRONMENT WATER MANAGEMENT ADMINISTRATION NIDE2500 BROENING HIGHWAY • BALTIMORE MARYLAND 21224 (410) 631-3543 1-800-633-6101 hnp:11WLYLY.1ride.SI81C.1id.115 11 ""1. 1�11.'�ai1"11.'7�11""•'• •�'7�111�1� nir h1� "iy1""�-12.1 11.'i�i1"I1.'7�I Revised August 2010…and Still Revising… Flood Volume (Qp) Requirements similar to 1997 MSD RegsMaintain peak flow for 2 yr (3.1”) & 100 yr (7.2”) stormNew Channel Protection Volume (CPv)Extended detention of 1 yr (2.5”) stormNew Water Quality Volume (WQv)Treatment using BMPs for 90% of annual storm events (1.14”)Mimicking pre-construction runoff conditions on new development projects (volume reduction)MSD 2006 Revised Rules and Regulations - Storm Water Criteria DAILY RAINFALL RECORD 1948-200301234560 10 20 30 40 50 60 70 80 90 100PERCENTILEDAILY RAINFALL (INCHES)Proper Adoption of BMPsBased on Local ConditionsWater Quality Protection Volume •Ponds•Wetlands•Infiltration Practices•Filtering Practices•Open Channel PracticesMSD Allows Many Best Management Practice (BMP) OptionsSupplement these with Storm Water Credits •NATURAL AREA CONSERVATION•DISCONNECTION OF ROOFTOP RUNOFF•DISCONNECTION OF NON-ROOFTOP IMPERVIOUS AREA•RESERVED BUFFERS•OPEN CHANNEL USE•ENVIRONMENTALLY SENSITIVE DEVELOPMENT•IMPERVIOUS COVER REDUCTIONStorm Water Credits -(Non-Structural BMPs) -Maryland Manual Chapter 5 MSD Post-Construction BMPs Permitted for ConstructionOctober 2006-August 2010878 Total Water Quality BMPs BIORETENTION/RAIN GARDEN41%UNDERGROUND SAND FILTER4%CISTERN/DRYWELL 2%DRY SWALE 9%INFILTRATION BMPs1%PONDS4%SURFACE SAND FILTER 14%PERMEABLE PAVEMENT10%PROPRIETARY BMP FILTER 5%PROPRIETARY HYDRODYNAMIC SEPARATOR8%GREEN ROOF 1%OTHER1% Treat Stormwater Reduced contaminant loadDetain Stormwater Reduced peak rateReduce Runoff Volume Reduced load, peak rate, & volumeAt the Source + Multiple Locations = Cumulative EffectImplementing the BestStormwater BMPs Volume Reduction BMPs –Hierarchy, in Order of Preference –To Try to “Lose” 1.14” of rainfall, (& maybe even up to 1.5”???)1.) Bioretention (Raingardens)2.) Permeable Pavements3.) Rainwater Harvesting4.) Green Roofs Runoff Volume Reduction Tool MSD Standard BMP Details BIORETENTION -RAINGARDENS TSS Metals (Cu, Zn, Pb) TKN (Nitrogen) Total-P BacteriaBioretention 40% 90% 93-98% 68-80% 70-83% 90%Sand Filter 0% 70% 45% 46% 33% 76%a: Volume Based Hydrology. Reese, A.J. Stormwater Magazine. September 2009.b: USEPA Fact Sheets EPA 832-F-99-007 (Sand Filters) and EPA 832-F-99-012 (Bioretention).Pollutant Removal RatebAnnual Volume ReductionaBMP TypeWHY RAINGARDENS?POLLUTANT ANDVOLUME REMOVAL CAPABILITIESCosts vary, $3 to $20 per cubic foot captured, (Average $7 to $8) Use NATIVEPlants•Deep Root Systems•Rainfall Infiltration Benefits•Rainfall Interception Benefits•Better Nutrient Removal•Minimal Irrigation - Conserves Water•Minimal or No Fertilizing, also help to Uptake Excess Fertilizer from Upstream Drainage Areas•Less Maintenance •Better Survivability•Enhance Biodiversity (Mosquito Control) and Promote a Conservation Culture•Control Erosion•Very Wet or Very Dry Conditions Native Plant Seeding } ENGINEERING DEPT PERMEABLE PAVEMENT FILE COPY LOCATION *11 To- JI F 0121E11X WEB xokiN PILOT STUDY PERVIOUS ASPHALT S. CARDINAL ALLEY, CITY BLOCK 1267 om• rot ;tinvi tiY Mr) O04Ri1E. If 5}144 9E ThE C k 1R+CI9R5 .;21.11011SECT. TO EVIEFFI11.E 11.2 AMA'. 2,f _NT1dA r1F AU. SUN F.Ka JTC4 M LIIOVIG BOWE teN14.ECfOr$s TO u1GO1fJAIfM1 Ln.rrci. rbore fa CCNSrruChc 1Ff Eacr.s use WW1 nrftFF or' mire EoYTk46 R M6 ormOF]hri FLAWS mho smj. • u.o room rid I PLWWM 414Jrr So.cYs S PET+I4FF' I ORIWIOk AMP iT...1.44 T11J.71t TO THE U7MI 7N 4F .EFR F+C741W 44 TOE YOP.1+.1d SC-T._kE OF NE fld#+MES FOR t rOOL OR is g1lFd' MERE FEOWIEL. N 14F E.EM kr LrEAPECrEF u1ure FlTEFFERE.CE ei EXOB W1E$EF Mud DoOSb_C1e . lhf 6e4TFb1'OR siVll idLiZIAULY WTI' 1FC LJRFFT coanare hr J.r D ID4l nr [r[1Xm1 oklll ACV I1.6411.01WY PETPNIP. 1Wr Pupa 1A114 Ihf ' .ES+ PAW PC HCTORE I TO SOME AT ME. OM PiC FOR B.' TF-E UH11R+C1OR ET YO ,.10ThTJ [ [DST TO THE 015MRFCT. Oki U.'R'E FT.R uTuTT I.k$FYLITbl1 111.5..2 I-�a•O44' 4l. w „ ertrsy 51 CITY OF SAINT LOUIS MISSOURI FRANCIS G. SLAY MAYOR DEPARTMENT OF THE PRESIDENT BOARD OF PUBLIC SERVICE MARJORIE L. MELTON, P.E. PRESIDENT SEPTEMBER, 200E APPROVED FOR CON STRUCTTON M.S.D. PERMITS FIEQUIIRED NE arit0.}MANcE W TH TEC FAD 8ttW OAFlrl oETMA 60{010T100I5AND SJ JETE r0IA5NPIOF, FILIAL ACCEPTANCE AND SOhMe5IFaN OF FINEL PiM MAPACTO r uACTuu ❑oPigNucmK irm MEarl&81 L J SEWFJ9 GL ING? ENO. F141-N R1We N RFS.i- EJiNE.F.FI INDEx. OF DRAWINGS Cri.Dk sHEEF 2 - ALLEY PL,Ire 3 - ALLEY TYPICAL SECTFON I - ALLEY TEPOGR Ftfr .•_ FSeGFLE 5 - DEW SHEET FI coehsL1'TrnN 'MTN Il71101.OL!JWF WORST O1T IR! DEPA.lIT1e1T O! C1cmoVI,TQ1 AIO IGItFP IIIECM LMMANNTI AT IMMIS4 I IID, F-11191-4O IMO NAM KIM 11 I kV r�1 - 1 1i C' _IAUER • •� .91! .` r4� H= •Jr w w.. Irr rrais +TyT AFL ill } 1.4413 UPI CM ...E1 A! hill Ede fn Yt L,Rr .. 1 w,ww our rar ram. ,..Sr ur 1•40 l#T 1 620 lima Drina . 1 .a+ 1616 iMO/.Y INLL ILLT nra. I.1 r.;T 1612 mil rt arre TA! 1 V, T{. CLEZ 160C) ar• rsl 1 u w17L xrw.- rm. ,.i, • hit! kdd 4ULY AMP. 11l1 AL[ WILE rn 1 mrn PEFIMEABLE PEVEJYE1T PILOT $TIAY PER 'aT+PREM. TOPOGRAPHY AID PROFILE MSD Pervious Pavement Specshttp://www.stlmsd.com/engineering/planreview/PlanReviewInformation/PropietaryBMPs Permeable Concrete $5 per sq. ft. ki1iII1NIi!iiil!IbI Permeable Pavers $6 to $10 per sq. ft. Porous Asphalt $4 per sq. ft. Rain Water Harvesting Rain Water HarvestingCredit given for runoff volume reduction for “engineered/designed systems”System must be emptied out within 2 days, to be ready for next rainfall eventIrrigation uses, or decanted and put back into storm sewer system after 2 daysNewer technologies, control systemsMSD has not seen much yet, but we would certainly consider itStill learning Green Roofs Green RoofsCredit given for runoff volume reductionDifferent sections/thicknesses will give different creditNewer technologies, costs?MSD has not seen much yet, but we would certainly consider itStill learning Regulatory OutlookMDNR ActivitiesEPA’s Draft Strategy for Clean WaterSee http://blog.epa.gov/waterforum/EPA’s Notice of Proposed Rulemaking (New Rule Target 2012) MDNR ActivitiesPermit fees will expire at the end of 2010—stay tuned Updated Field Guide for Protecting Water Quality (Construction Site Sediment Control)Missouri Guide to Green Infrastructure Forthcoming (Post-Construction BMPs)Hinkson Creek Volume Based TMDLEnforcement activities for failure to respond Volume Based Hydrology: The FutureEPA’S EISA Section 438 Guidance Federal facilities as small as 5,000 sq. ft.A BIG DEAL: THE DESIGN STORMProposed: 95thPercentile Event (STL=1.54”)Federally Funded Highway Projects (STOPS)???What requirements will apply where runoff reduction is not technically achievable? How much can flood detention requirements be reduced where runoff reduction of the 95thpercentile storm is achieved? Thank You!Questions?John Grimm, P.E.Principal Engineer –Development ReviewMetropolitan St. Louis Sewer District2350 Market StreetSt. Louis, MO 63103314-768-2743jcgrim@stlmsd.comwww.stlmsd.com