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Building the Reservoirs Watershed Development & Tmdls

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Building the Reservoirs Watershed Development & Tmdls 1 . Building the Reservoirs . Watershed Development & TMDLs . TMDL Implementation . Retrofit Design . MS4 Cooperation . Phosphorus Reductions . Lessons Learned & Retrofit Program Now 2 2 3 3 4 New Amsterdam Water Supply 4 5 NYC Population Growth 80,000 60,000 40,000 20,000 0 1650 1750 1800 5 6 First Water Pollution Law in North America? Prohibited dumping “filth, garbage or dirt” into pond - 1778. The pond was filled in - 1811. 6 7 Search for a Reliable Water Supply NYC grew from 80,000 to 200,000 between 1800 and 1830 1835 City issued a $2.5M bond to build a Croton River dam & aqueduct to NYC 7 8 8 9 9 10 High Bridge over the Harlem River 10 11 1841 – Croton Aqueduct 11 12 NYC Population continues to grow: 1830 – pop. 200,000 1850 – pop. 700,000 1900 – pop. 3,400,000 12 13 13 14 East Branch Reservoir 14 15 West Branch Reservoir 15 16 Amawalk Reservoir 16 17 Titicus Reservoir 17 18 Croton Falls Reservoir 18 19 Bog Brook Reservoir 19 20 20 21 Muscoot & Cross River Reservoirs 21 22 Population increase in Croton Watershed Westchester & Putnam Counties increase by 500,000: . 1940 – 590,000 . 2010 – 1,050,000 23 NYC Reservoir TMDLs 1995 - 303d Listed 19 NYC Reservoirs Nutrient Pollution 2000 – 19 TMDLs approved 108 WWTPs to be upgraded WOH in compliance after upgrades EOH req’d reductions beyond WWTP upgrades 23 24 2003: EOH Watershed designated MS4s: Beekman Lewisboro T & V/Pawling Mount Kisco East Fishkill North Castle Kent North Salem Southeast Pound Ridge Carmel Somers Cortlandt Yorktown Patterson Putnam County Brewster Dutchess County Putnam Valley Westchester County Bedford NYSDOT 24 New York City EOH Watershed 25 25 26 2008 MS4 Permit Heightened Requirements: MS4s in impaired watersheds are required to submit an approvable plan to construct stormwater retrofits, and a timetable for their implementation. Q: What is an Approvable Plan? 26 27 Croton Watershed TMDL Implementation Plan 2009 TMDL Load Allocation target = 6,741 kg/yr . Watershed model results: HID land = 2,400 kg/yr . 50% of developed load = 1,200 kg/yr . 50% efficiency for retrofits = 600 kg/yr . A Starting Point… Phosphorus Reduction Requirement: 600 kg/yr . Over each 5-year MS4 Permit Cycle . Watershed-wide Subject to Public Review . No comments dissenting (too high or too low) on assigned load values 27 28 EOH MS4 5-year allocations (kg/yr) Bedford 32.2 Village of Pawling 4.3 Brewster 9.2 Town of Pawling 3.5 Carmel 72.0 Pound Ridge 9.5 Cortlandt 11.6 Putnam Valley 1 Kent 33.6 Somers 50.0 Lewisboro 35.5 Southeast 31.1 Mount Kisco 18.7 Yorktown 54.0 New Castle 25.1 Beekman 1 North Castle 1 East Fishkill 3.2 North Salem 19.1 Dutchess County 3.1 Putnam County 30.9 Westchester County 8.2 Patterson 17.2 NYS DOT 125 28 29 Approvable Retrofit Design 1. What is the phosphorus load? 2. What is the BMP efficiency? 29 30 Phosphorus to be Treated Phosphorus Load = runoff *concentration • runoff = 90th percentile storm 30 31 Phosphorus Concentrations Impervious: 0.50 mg/l Residential 0.41 mg/l Developed Open Space: 0.30 mg/l Forest: 0.15 mg/l 31 32 Retrofit Efficiencies Wet Extended Detention Pond 55% Bioretention 65% Dry Swale 50% Sand Filter 60% Organic Filter 60% Shallow Wetland 43% 32 33 Retrofit Sizing Design per NYS Stormwater Design Manual • treat 90th% ~1.3” Storm • Smaller retrofits get partial credit Hydrodynamic Separators • Treat Peak Flow Rate from 90% Storm • Smaller retrofits get partial credit Channel Stabilization • Calculate eroded volume of soil • 100% of phosphorus in soil is credited 34 Regional MS4 Group . Group of MS4s, aka Regional Stormwater Entity (RSE) to submit retrofit plan . 19 Municipalities across three Counties worked together . Individual MS4s compliant if RSE meets combined load 34 35 East of Hudson Watershed Corporation Two full-time Engineering staff now manage over 200 projects: . design . DEC approval . bid process . contract award . construction . project certification 36 Funding the Projects Year 1-5 Funding: • $20 million NYC + $20 million Putnam and Westchester Counties WQ money • O&M paid for by MS4 Municipalities Additional Funding: WQIP Grant Program Prioritizes MS4-required Retrofits 37 Extended Detention Pond 37 38 Pocket Pond 38 39 Wet Pond 39 40 Extended Detention Shallow Wetland 40 41 Micropool Detention 41 42 Outfall Stabilization 42 Bioretention 43 43 44 Extended Detention Pond 44 45 Channel Stabilization 45 46 Pervious Pavers 46 47 22 MS4s – 3 Counties 48 200+ stormwater retrofit projects 49 Phosphorus Reductions: 600+ kg/yr 50 Future Phosphorus Reduction EOHWC Year 6-10 Retrofit Plan approved • Over 155 New Retrofit Projects Proposed • Estimated 750+ kg/yr • More Channel Stabilization Projects • More Municipal Property https://nysdec.maps.arcgis.com/home/index.html 51 MS4 Retrofit Program 2018 and beyond https://nysdec.maps.arcgis.com/home/index.html 52 Thank You! Robert Capowski [email protected] Ken Kosinski Chief, NYC Watershed Section [email protected] Bureau of Water Resource Management.
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