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Arlington’s watersheds Chesapeake Bay watershed
Stormwater Management in Arlington Ballston Pond Retrofit Project - - PowerPoint PPT Presentation
Stormwater Management in Arlington Ballston Pond Retrofit Project - - PowerPoint PPT Presentation
Stormwater Management in Arlington Ballston Pond Retrofit Project Chesapeake Bay Arlingtons watersheds watershed Storm drain to local stream Water in storm drains does not go to a treatment plant Current Stormwater Challenges
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Storm drain to local stream… Water in storm drains does not go to a treatment plant…
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Current Stormwater Challenges
- Existing Development. Most of Arlington was
built before stormwater regulations existed.
County streams are heavily impacted.
- New state and federal regulations to reduce
water pollution.
- Aging Infrastructure. More than half of the
storm sewer network is over 50 years old.
- System Capacity.
- Climate change. Climate models predict heavy
rainfall events could increase sharply.
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Regulatory Requirements
- Virginia Stormwater Permit requires us to
reduce stormwater pollution from existing and new development, as much as
- possible. The permit requirements are
becoming more stringent.
- Chesapeake Bay TMDL in development.
- Master Transportation Plan includes
recommendations for street trees and reduction of stormwater runoff.
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Impacts from Stormwater Runoff
Potomac River is our source of drinking water. Stormwater runoff erodes local streams, carrying sediment downstream, killing trees, and damaging sewer lines. Sediment is major pollutant of concern for Chesapeake Bay.
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Stormwater Strategy
- Maintain & replace stormwater infrastructure
- Improve existing, and add new, stormwater
treatment facilities
- Stormwater controls for new development
- Reduce risks from flooding
- Restore stream corridors
- Implement urban housekeeping best
practices (such as street sweeping)
- Outreach, education, and monitoring
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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.
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Ballston Pond Retrofit
- Improve ability of existing stormwater pond to
improve water quality and remove nutrients
- Treats several hundred acres of impervious
area
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Watershed Retrofit Plans
- 209 potential projects; 7 in design
- 8.1 acres of impervious area to be treated
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New Stormwater Facilities
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Stream Restoration
Before After
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Urban Housekeeping
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Outreach and Education
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