SLIDE 1 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
SLIDE 2 What Are Stormwater Retrofits?
Stormwater retrofits are
stormwater management practices in locations h t t where stormwater controls did not previously exist or previously exist or were ineffective
Rolling Stone Retrofit Montgomery Co., MD
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Bioretention in Action Bioretention in Action
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Retrofitting Philosophy Retrofitting Philosophy
Retrofitting urban watersheds is involves the A t f O t it Art of Opportunity
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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.
SLIDE 7 What Did We Do?
Purpose
Desktop Analysis
– Rapidly search for and identify potential retrofit sites across the subwatershed across the subwatershed – Save time in the field
464 potential locations identified:
Doctor’s Branch: 141 Lubber Run: 147 Spout Run: 124 Windy Run: 52
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Retrofit Reconnaissance I nventory (RRI ) Reconnaissance I nventory (RRI )
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DOCTOR’S BRANCH RETROFITS
Site DB-130: Arlington Hall Park
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DOCTOR’S BRANCH RETROFITS
Site DB-130: Arlington Hall Park
Bioretention Cell
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LUBBER RUN RETROFITS
Site LR-114: Lubber Run Community Center
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LUBBER RUN RETROFITS
Site LR-114: Lubber Run Community Center
Bioretention Cell
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H did d ? How did we do?
SLIDE 14 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.
SLIDE 15 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.
SLIDE 16 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.
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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.
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Next Steps
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Arlington County Constructed Retrofits
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McKinley School
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Marymount University
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Patrick Henry Drive
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DOCTOR’S BRANCH RETROFITS
Site DB-101: North Quincy Street/Mosaic Park
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DOCTOR’S BRANCH RETROFITS
Site DB-101: North Quincy Street/Mosaic Park
Bioretention Cell Bioretention Cell
