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Middle Potomac Watershed Plan Implementation
Dead Run Stream Restoration Project
Public MeetingMcLean Community Center
April 23, 2014
Stormwater Planning DivisionDepartment of Public Works and Environmental Services
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Meeting Outline
• Fairfax County Stormwater Management• Countywide Watershed Plan Implementation• Project Introduction and Objectives• Existing Conditions• Proposed Improvements - Options• Example Projects• Questions?
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Fairfax County Department of Public Works and Environmental Services (DPWES)Department of Public Works and
Environmental Services
Land Development
Services
CapitalFacilities Solid Waste Stormwater
Stormwater Planning Division
Maintenance and Stormwater
Management Division
Wastewater
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Stormwater Infrastructure
• Conveyance System– 1,600 miles pipe and
paved channel– 43,000 structures– 6,800 outfalls
• Management Facilities– 1,540 County Maintained – 3,720 Privately Maintained
• State Regulated Dams
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Service Drivers
In response to The Clean Water Act of 1972…
National Pollutant Discharge Elimination System (NPDES)Virginia Stormwater Management Program (VSMP)
RegulationsMunicipal Separate Storm Sewer Permit (MS4)Total Maximum Daily Loads (TMDLs)
Chesapeake BayLocal Streams
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Countywide Watershed Planning
“Healthy Watersheds, Healthy Communities”
• 30 Designated Watersheds
• All 15 watershed plans have been adopted by Fairfax County
http://www.fairfaxcounty.gov/dpwes/watersheds/
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Middle Potomac Watershed Plan
• Watershed Characterization– Water Quality Monitoring– Land Use Change– Pollutant Loading
• Structural Project– 25 year plan
• Non-Structural Practices– Policy and Regulations
http://www.fairfaxcounty.gov/dpwes/watersheds/
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Dead Run Watershed Plan
• Dead Run has a drainage area just over 3 mi2
• 24 priority projects identified in the watershed management plan
• Pond retrofits• LID Stormwater Enhancements• Stream Restoration• Neighborhood Stormwater
Improvementshttp://www.fairfaxcounty.gov/dpwes/stormwater/projects/project_list.htm
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Approximately 1/3 of the roof is covered in vegetation. The benefits of a “living roof” include:• Reduces the amount of stormwater runoff• Absorbs air pollution and carbon dioxide• Reduces the energy needed to cool the building in summer
Partnership: LID Stormwater EnhancementsDolley Madison Library
Vegetated Roof- Delosperma and Allium plants in bloom
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Partnership: LID Stormwater EnhancementsDolley Madison Library
Sustainable Site Design
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Dead Run – Before & After
Drainage Area(acres)
Phosphorous Removal(lbs/yr)
Nitrogen Removal(lbs/yr)
Sediment Removal(tons/yr)
415 15 283 3
Stream Restoration
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Dead Run – Stream Restoration
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Stream Monitoring Program
Study Objectives
1. Generate long-term monitoring data.
2. Evaluate relations between observed conditions/trends and BMP implementation.
3. Transfer the understanding gained to other less-intensively monitored watersheds.
http://va.water.usgs.gov/projects/ffx_co_monitoring.htm
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Dead Run Stream Restoration
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Dead Run Stream Restoration
Segment 1 – Dominican Retreat
• 2,000 Linear Feet
• Extends to Old Dominion Drive
• Residential lots along Merrimac Drive and Van Ness Court
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Dead Run Stream Restoration
Segment 2 – McLean Central Park
• 800 Linear Feet
• Completely in Park
• Starts below previously restored section near library
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Dead Run Stream Restoration
Segment 3 – McLean Central Park
• 1,500 Linear Feet
• Extends to Churchill Road
• Residential lots along Elizabeth Drive and Carol Rayes Street
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Next Steps
• Conceptual Design• Land Acquisition/Coordination• Preliminary Design• Public Meeting• Final Design• Project Construction
• Funding FY2016 and FY2017• Community Coordination: Pardon our Dust
• Maintenance and Operation
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Natural Channel Design
Background and Design Approach
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Stream Design Approaches Natural Channel Design
3 design approaches 1)Analog 2)Empirical 3)Analytical
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Segment 1
Dominican Retreat
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Segment 2 & 3
Mclean Central ParkDead Run Stream Valley Park
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Alternative Access
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Alternative Access
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Instream Structures
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Looking upstream at boulder rock toe and constructed riffle
Looking upstream at boulder rock toe – 2 and 3 courses
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Modified Cross Vane
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Modified Cross Vane
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Click icon to add picture
Cross Vane Cross Vane
Cross Vane
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Step Pool
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Infill mix comprised of cobbles, gravels, sand, silt, topsoil
Larger material, usually cobble
Constructed Riffle(aka Reinforced Streambed)
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Riffle
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Access
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During May 2010
BeforeFeb. 2010
AfterSept. 2010
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John Palmer, [email protected]
Dipmani Kumar, [email protected]
Matt Meyers, [email protected]
Stormwater Planning DivisionDepartment of Public Works and Environmental ServicesFairfax County12000 Government Center Parkway, Suite 449Fairfax, Virginia 22035
www.fairfaxcounty.gov/dpwes/stormwater
Questions ?
• Contact Information
A Fairfax County Publication, April 2014ADA Statement: To request this information in an alternate format call 703-324-5500, TTY 711