Watershed Planning Workshop Lower Four Mile Run, Roaches Run, Rocky Run, Potomac Palisades May 30, 2012 Walter Reed Community Center
Watershed Planning Result is an inventory of potential stormwater retrofit projects. Initiated May 2008 Contracted to Center for Watershed Protection Anticipates Chesapeake Bay clean-up requirements Part of Arlington’s Stormwater Master Plan update
Stormwater Master Plan Update Storm Sewer Capacity Analysis to study the County's current storm sewer pipes. County-wide stream inventory to assess stream conditions and prioritize stream restoration projects. Watershed plans to identify locations where stormwater treatment facilities can be added to help slow down and filter polluted stormwater runoff.
Arlington’s Watersheds
Chesapeake Bay Arlington’s Pollutant Reduction Requirements - 2025 Nitrogen 7.3% Phosphorus 12.8% Sediment 17.9% This means capturing & treating the stormwater from = 4500 acres = 36,000 homes
Storm drain to local stream… Water in storm drains does not go to a treatment plant… To the Potomac River On to the Chesapeake Bay
Effect of Urbanization on Watersheds Arlington County 41%
Severe streambank erosion and habitat degradation
Stormwater Retrofits A retrofit is a stormwater management facility designed to slow and treat polluted stormwater runoff that is currently uncontrolled.
Why Stormwater Retrofits? Stormwater retrofits provide our best opportunities to improve watershed health, along with redevelopment and stream restoration. Required to meet Chesapeake Bay clean-up goals.
Why Stormwater Retrofits? Stormwater retrofits: Clean and filter pollutants from stormwater Slow and temporarily store stormwater runoff Improve water quality in our local streams
Impervious Surfaces in Arlington Roads Buildings Parking Lots Sidewalks Driveways Other 7% 5% 8% 34% 16% 30% Impervious cover in Arlington = 41% or 6867 acres
Stormwater retrofitting on private property is essential for significant change. Rain Garden
Homeowner retrofit examples Cistern Rain Garden
Green roofs
Homeowner retrofit examples Rain Barrel(s) Pervious Pavement
StormwaterWise Landscapes Incentive Program
To Learn More Stormwater Master Plan Update http://www.arlingtonva.us/departments/EnvironmentalServices/Sustainability/page74076.aspx Watershed Retrofit Planning http://www.arlingtonva.us/departments/EnvironmentalServices/Sustainability/page67082.aspx StormwaterWise Landscapes www.arlingtonva.us/stormwaterwise Rain Gardens for Homeowners Workshops http://www.novaregion.org/index.aspx?NID=977 Rain Barrel Workshops & Sales http://www.arlingtonenvironment.org/barrel.php Green It! Workshop Series http://www.arlingtonva.us/portals/topics/Climateevents.aspx Like us on Facebook! www.facebook.com/#!/ArlingtonDES
Plan Implementation 58% of County assessed, 925 retrofit projects in inventory Established a Green Streets Program 2 projects constructed Multiple projects in design • Williamsburg Blvd median (Old Dominion to 35th St N) • 8 th St S (at Monroe St S) • S Hayes St at Pentagon City $2.5 million budgeted for FY 13-17
% Impervious Cover - 2009 County 41 Pimmit Run, Mainstem 34 Rixey Branch 30 Stohman's Run 38 Lower Four Mile Run 45 Nauck Branch 45 Virginia Highlands 47 Roaches Run 53 Lower Long Branch 42 Cemetary/Pentagon 31 Rocky Run 64 Rosslyn 76 Colonial Village Branch 55 Palisades 18
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