HomeMy Public PortalAboutMSD 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
" B e g i n s t o r m w a t e r m a n a g e m e n t e a r l y i n t h e s i t e d e v e l o p m e n t p r o c e s s " L I D , L E E D , S t o r m W a t e r P h a s e I I R e g u l a t i o n s " L e s s s e w e r s , l e s s c u r b s , l e s s h a r d s u r f a c e s , l e s s r u n o f f " M o r e g r e e n s p a c e , m o r e s w a l e s , m o r e n a t u r a l f e a t u r e s , m o r e n a t i v e v e g e t a t i o n N e w D e s i g n M e t h o d s & . . L e t s C h a n g e B u s i n e s s a s U s u a l & W e H a v e t o
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THE
METROPOLITAN ST. LOUIS
SEWER DISTRICT
RULES AND REGULATIONS
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REQUIREMENTS
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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
" P o n d s " W e t l a n d s " I n f i l t r a t i o n P r a c t i c e s " F i l t e r i n g P r a c t i c e s " O p e n C h a n n e l P r a c t i c e s M S D A l l o w s M a n y B e s t M a n a g e m e n t P r a c t i c e ( B M P ) O p t i o n s S u p p l e m e n t t h e s e w i t h S t o r m W a t e r C r e d i t s
" N A T U R A L A R E A C O N S E R V A T I O N " D I S C O N N E C T I O N O F R O O F T O P R U N O F F " D I S C O N N E C T I O N O F N O N - R O O F T O P I M P E R V I O U S A R E A " R E S E R V E D B U F F E R S " O P E N C H A N N E L U S E " E N V I R O N M E N T A L L Y S E N S I T I V E D E V E L O P M E N T " I M P E R V I O U S C O V E R R E D U C T I O N S t o r m W a t e r C r e d i t s - ( N o n - S t r u c t u r a l B M P s ) - M a r y l a n d M a n u a l C h a p t e r 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
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FRANCIS G. SLAY
MAYOR
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MARJORIE L. MELTON, P.E.
PRESIDENT
SEPTEMBER, 200E
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MSD Pervious Pavement Specshttp://www.stlmsd.com/engineering/planreview/PlanReviewInformation/PropietaryBMPs
Permeable Concrete $5 per sq. ft.
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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