Workshop Windy Run, Spout Run, Lubber Run and Doctors Branch - PowerPoint PPT Presentation

Watershed Planning Workshop Windy Run, Spout Run, Lubber Run and Doctor‟s Branch January 13, 2011 Washington & Lee High School

Arlington‟s watersheds Chesapeake Bay watershed

Watershed Retrofit Assessment  Initiated May 2008  Contracted to Center for Watershed Protection  For each watershed, result is an inventory of potential stormwater retrofit projects.  http://www.arlingtonva.us/departments/Environm entalServices/cpe/page60407.aspx  Component of Arlington‟s Stormwater Master Plan Update

Stormwater Master Plan Update  Stormwater Master Plan (1996) and Watershed Management Plan (2001) will be updated and combined into a comprehensive Master Plan.  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 retrofit plans to identify locations where stormwater treatment facilities can be added to help slow down and filter stormwater runoff.

Stormwater Retrofits A retrofit is a stormwater management facility designed to store, infiltrate, and/or filter stormwater runoff from a contributing drainage area for which a stormwater management facility currently does not exist.

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

Sediment and Nutrients

Effect of Urbanization on Watersheds Impervious surface Runoff speed and volume Water Quality Groundwater supply Stream Corridor Restoration, FISRWG, 1998

Severe streambank erosion and habitat degradation

Effect of Urbanization on Watersheds

Why Stormwater Retrofits?  County streams are impacted.  Most development occurred before regulations that protect water quality and streams were enacted.  Stormwater retrofits provide our best opportunities to improve watershed health, along with redevelopment and stream restoration.

Why Stormwater Retrofits? Stormwater retrofits will help:  Clean and filter pollutants from runoff  Slow and temporarily store stormwater runoff  Improve water quality in our local streams

Impervious cover in Arlington = 42%

Impervious cover in Arlington County - 2007 Airport Alley 3.8% 0.2% Handicap ramp 0.1% Driveway 7.4% Buildings 30.1% Parking lot 15.7% Paved median 0.6% Sidewalks 8.4% Roads 33.8%

Watershed Planning Status  209 projects identified  7 Green Streets projects in design  8.1 acres of impervious area to be treated • Williamsburg Blvd median (Old Dominion to 35th St N) • Williamsburg Blvd median (Harrison to Edison N) • Kensington Blvd (at 33 rd St N) • 32nd St N (at Kensington Blvd) • John Marshall Dr median • Patrick Henry Dr (at 9 th Rd N) • 8 th St S (at Monroe St S)

Limitations of Watershed Retrofits  Time and funding limitations mean projects will be implemented incrementally.  On average, assessments indicate about 15% of impervious area can be retrofitted.  Retrofits alone cannot solve current flooding, infrastructure and stream erosion problems.  County must and will fund and implement infrastructure updates and stream restoration projects in addition to retrofits.  Implementation on private property is essential for significant change.

Homeowner retrofit examples Cistern Rain Garden

Homeowner retrofit examples Rain Barrel(s) Pervious Pavement

Green roofs

INSERT NAME OF PROGRAM  Retrofit incentive program for homeowners  Partnership with Arlingtonians for a Clean Environment  In pilot year, providing 40 matching grants of $500-$1000 to homeowners for sustainable stormwater projects.  Applications available this spring.  INSERT WEB ADDRESS

% Impervious Surface Windy Run, Spout Run, Lubber Run and Doctor‟s Branch 47.7 46.2 40.7 42.1 42.7 % Impervious Cover 35.7 2005 2007 Windy Spout Lubber Doctor's County- Run Run Run Branch wide

Land Use Source: 2001 Watershed Management Plan Spout Run Arlington County 13% 6% 14% 57% 29% 4% 48% 6% 6% 4% Windy Run 9% 4% 1% Low Density Medium Density 16% 3% High Density Vacant 5% Public Commercial 1% 74%

Impervious Surface Types Doctor's Branch Lubber Run 0.1% 0.4% 10% 10% Alley Buildings 31% 34% Driveway 30% 34% Parking Lots Roads 9% 9% Sidewalks 20% 13% Impervious surfaces are both public and private. There is a shared responsibility for the problem and the solution!

Questions??  Contact info:  Phone: (703) 228-3588  Email: cjolicoeur@arlingtonva.us  Web: www.arlingtonva.us Residents Environment Watershed Management http://www.co.arlington.va.us/departments/Environ mentalServices/epo/page74076.aspx