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Bullneck Run at Spring Hill Rec Center Stream Restoration Project June 2014

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Bullneck Run at Spring Hill Rec Center Stream Restoration Project June 2014

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Bullneck Run at Spring Hill Rec Center Stream Restoration Project June 2014

  1. 1. Middle Potomac Watershed Plan Implementation Bull Neck Run at Spring Hill Recreation Center Stream Restoration Project Public Meeting June 18, 2014 Stormwater Planning Division Department of Public Works and Environmental Services
  2. 2. Meeting Outline • Fairfax County Stormwater Management • Countywide Watershed Plan Implementation • Project Introduction and Objectives • Existing Conditions • Proposed Improvements - Options • Example Projects • Questions?
  3. 3. Fairfax County Department of Public Works and Environmental Services (DPWES) Department of Public Works and Environmental Services Land Development Services Capital Facilities Solid Waste Stormwater Stormwater Planning Division Maintenance and Stormwater Management Division Wastewater
  4. 4. 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
  5. 5. Service Drivers In response to The Clean Water Act of 1972  National Pollutant Discharge Elimination System (NPDES)  Virginia Stormwater Management Program (VSMP) Regulations  Municipal Separate Storm Sewer Permit (MS4)  Total Maximum Daily Loads (TMDLs)  Chesapeake Bay  Local Streams
  6. 6. 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/
  7. 7. 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/
  8. 8. Bull Neck Run Watershed Plan • Bull Neck Run has a drainage area of 2.5 mi2 • Projects identified in the watershed management plan • Pond retrofits • LID Stormwater Enhancements • Stream Restoration • Neighborhood Stormwater Improvements http://www.fairfaxcounty.gov/dpwes/stormwater /projects/project_list.htm
  9. 9.  Goal is to provide water quality control and channel protection volume for the Spring Hill Recreation Center expansion project. Partnership:LIDStormwaterEnhancements SpringHill Rec-Center 26 Space Pavers and 1 Tree Box Filter
  10. 10. Partnership: LIDStormwaterEnhancements SpringHill Rec-Center Detention Pond Retrofit Before and After
  11. 11. Before Wakefield Run Stream Restoration After
  12. 12. Wakefield Run Stream Restoration Before After
  13. 13. Rabbit Branch Stream Restoration Before After
  14. 14. Bull Neck Run Stream Restoration
  15. 15. Next Steps • Conceptual Design • Land Acquisition/Coordination • Preliminary Design • Public Meeting • Final Design • Project Construction (Phase I and II) • Phase I Funding FY2016 or FY2017 • Phase II Funding to be allocated in future • Community Coordination: Pardon our Dust • Maintenance and Operation
  16. 16. Bull Neck Run Project Area
  17. 17. Natural Channel Design Background and Design Approach
  18. 18. Stream Design Approaches Natural Channel Design 3 design approaches 1)Analog 2)Empirical 3)Analytical
  19. 19. Phase 1 Bull Neck Run at Spring Hill
  20. 20. Phase 2 Bull Neck Run at Spring Hill
  21. 21. Instream Structures
  22. 22. Looking upstream at boulder rock toe and constructed riffle Looking upstream at boulder rock toe – 2 and 3 courses
  23. 23. Modified Cross Vane
  24. 24. Modified Cross Vane
  25. 25. Cross Vane Cross Vane Cross Vane
  26. 26. Step Pool
  27. 27. Infill mix comprised of cobbles, gravels, sand, silt, topsoil Larger material, usually cobble Constructed Riffle (aka Reinforced Streambed)
  28. 28. Riffle
  29. 29. Access
  30. 30. During May 2010 Before Feb. 2010 After Sept. 2010
  31. 31. Ratna Pottumuthu Ratna.Pottumuthu@FairfaxCounty.gov Matt Meyers Matthew.Meyers@fairfaxcounty.gov Stormwater Planning Division Department of Public Works and Environmental Services Fairfax County 12000 Government Center Parkway, Suite 449 Fairfax, Virginia 22035 www.fairfaxcounty.gov/dpwes/stormwater Questions ? • Contact Information A Fairfax County Publication, April 2014 ADA Statement: To request this information in an alternate format call 703-324-5500, TTY 711

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