Arlington County Arlington County Watershed Retrofits Greg - PowerPoint PPT Presentation

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