Arlington County Arlington County Watershed Retrofits Greg Hoffmann & Cecilia Lane Center for Watershed Protection Center for Watershed Protection Septembe 19 2011 September 19, 2011 Arlington County, Virginia
What Are Stormwater Retrofits? • Stormwater Stormwater retrofits are stormwater management practices in locations where stormwater h t t controls did not previously exist or previously exist or were ineffective Rolling Stone Retrofit Montgomery Co., MD
Bioretention in Action Bioretention in Action
Retrofitting Philosophy Retrofitting Philosophy Retrofitting urban watersheds is involves the A t Art of Opportunity f O t it
Retrofitting Philosophy Retrofitting Philosophy Retrofitting urban watersheds is not about drastic Retrofitting urban watersheds is not about drastic changes to the surface and subsurface landscape.
What Did We Do? Desktop Analysis • Purpose Purpose – Rapidly search for and identify potential retrofit sites across the subwatershed across the subwatershed – Save time in the field • Result 464 potential locations identified: Doctor’s Branch: 141 Lubber Run: 147 Spout Run: 124 Windy Run: 52
Retrofit Reconnaissance I nventory (RRI ) Reconnaissance I nventory (RRI )
DOCTOR’S BRANCH RETROFITS Site DB-130: Arlington Hall Park
DOCTOR’S BRANCH RETROFITS Site DB-130: Arlington Hall Park Bioretention Cell
LUBBER RUN RETROFITS Site LR-114: Lubber Run Community Center
LUBBER RUN RETROFITS Site LR-114: Lubber Run Community Center Bioretention Cell
How did we do? d ? did H
Results Doctor’s Branch • 76 viable sites • 76 viable sites • 73.48 acres treated • 36.15 acres of impervious cover treated • 8% of the watershed treated • 12% of impervious area treated • 35 10 lbs of Phosphorus removal per year • 35.10 lbs of Phosphorus removal per year • 288.73 lbs of Nitrogen removal per year.
Results Lubber Run • 141 viable sites • 141 viable sites • 129.67 acres treated • 64.51 acres of impervious cover treated • 13% of the watershed treated • 17% of impervious area treated • 49 36 lbs of Phosphorus removal per year • 49.36 lbs of Phosphorus removal per year • 396.98 lbs of Nitrogen removal per year.
Results Spout Run • 70 viable sites • 70 viable sites • 53.46 acres treated • 28.03 acres of impervious cover treated • 5% of the watershed treated • 7% of impervious area treated • 22 18 lbs of Phosphorus removal per year • 22.18 lbs of Phosphorus removal per year • 180.92 lbs of Nitrogen removal per year.
Results Windy Run • 23 viable sites • 23 viable sites • 30.28 acres treated • 12.07 acres of impervious cover treated • 10% of the watershed treated • 18% of impervious area treated • 8 45 lbs of Phosphorus removal per year • 8.45 lbs of Phosphorus removal per year • 70.35 lbs of Nitrogen removal per year.
Next Steps
Arlington County Constructed Retrofits
McKinley School
Marymount University
Patrick Henry Drive
DOCTOR’S BRANCH RETROFITS Site DB-101: North Quincy Street/Mosaic Park
DOCTOR’S BRANCH RETROFITS Site DB-101: North Quincy Street/Mosaic Park Bioretention Cell Bioretention Cell
Recommend
More recommend
