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Middle Potomac Watershed Plan Implementation 
Turkey Run at Langley High School 
Stream Restoration Project 
Public Meeting 
September 16, 2014 
Stormwater Planning Division 
Department of Public Works and Environmental Services
Meeting Outline 
• Fairfax County Stormwater Management 
• Countywide Watershed Plan Implementation 
• Project Introduction and Objectives 
• Existing Conditions 
• Proposed Improvements - Options 
• Example Projects 
• Questions?
Fairfax County Department of Public Works 
and EnvironmDeenpatratmle Snt oef r Pvuibclice Wso r(ksD aPnd WES) 
Environmental Services 
Land 
Development 
Services 
Capital 
Facilities 
Solid Waste Stormwater 
Stormwater 
Planning Division 
Wastewater 
Maintenance and 
Stormwater 
Management 
Division
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
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
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/
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/
Turkey Run Watershed Plan 
• Turkey Run has a drainage 
area of 1.95 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
Wakefield Run Stream Restoration 
Before 
After
Wakefield Run Stream Restoration 
Before After
Rabbit Branch Stream Restoration 
Before After
Turkey Run Stream 
Restoration
Next Steps 
• Conceptual Design 
• Land Acquisition/Coordination 
• Preliminary Design 
• Public Meeting 
• Final Design 
• Project Construction 
• Funding FY2016 or FY2017 
• Community Coordination: Pardon our Dust 
• Maintenance and Operation
Natural Channel Design 
Background and Design Approach
Stream Design Approaches 
Natural Channel Design 
3 design approaches 
1)Analog 
2)Empirical 
3)Analytical
Turkey Run at Langley High School 
Stream Restoration 
Concept Design
Examples
Looking upstream at boulder 
rock toe and constructed 
riffle 
Looking upstream at boulder 
rock toe – 2 and 3 courses
Modified Cross Vane
Modified Cross Vane
Cross Vane 
Cross Vane Cross Vane
Step Pool
Infill mix comprised of 
cobbles, gravels, sand, silt, 
topsoil 
Larger material, usually 
cobble 
Constructed Riffle 
(aka Reinforced Streambed)
Riffle
Access
Before 
Feb. 2010 
During 
May 2010 
After 
Sept. 2010
Questions ? 
• Contact Information 
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 
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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Turkey Run at Langley High School Stream Restoration Public Meeting

  • 1. Middle Potomac Watershed Plan Implementation Turkey Run at Langley High School Stream Restoration Project Public Meeting September 16, 2014 Stormwater Planning Division Department of Public Works and Environmental Services
  • 2. Meeting Outline • Fairfax County Stormwater Management • Countywide Watershed Plan Implementation • Project Introduction and Objectives • Existing Conditions • Proposed Improvements - Options • Example Projects • Questions?
  • 3. Fairfax County Department of Public Works and EnvironmDeenpatratmle Snt oef r Pvuibclice Wso r(ksD aPnd WES) Environmental Services Land Development Services Capital Facilities Solid Waste Stormwater Stormwater Planning Division Wastewater Maintenance and Stormwater Management Division
  • 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. 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. 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. 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. Turkey Run Watershed Plan • Turkey Run has a drainage area of 1.95 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. Wakefield Run Stream Restoration Before After
  • 10. Wakefield Run Stream Restoration Before After
  • 11. Rabbit Branch Stream Restoration Before After
  • 12. Turkey Run Stream Restoration
  • 13. Next Steps • Conceptual Design • Land Acquisition/Coordination • Preliminary Design • Public Meeting • Final Design • Project Construction • Funding FY2016 or FY2017 • Community Coordination: Pardon our Dust • Maintenance and Operation
  • 14. Natural Channel Design Background and Design Approach
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  • 16. Stream Design Approaches Natural Channel Design 3 design approaches 1)Analog 2)Empirical 3)Analytical
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  • 20. Turkey Run at Langley High School Stream Restoration Concept Design
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  • 36. Looking upstream at boulder rock toe and constructed riffle Looking upstream at boulder rock toe – 2 and 3 courses
  • 39. Cross Vane Cross Vane Cross Vane
  • 41. Infill mix comprised of cobbles, gravels, sand, silt, topsoil Larger material, usually cobble Constructed Riffle (aka Reinforced Streambed)
  • 44. Before Feb. 2010 During May 2010 After Sept. 2010
  • 45. Questions ? • Contact Information 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 A Fairfax County Publication, April 2014 ADA Statement: To request this information in an alternate format call 703-324-5500, TTY 711

Editor's Notes

  1. Conduct Geomorphic and Watershed (HH assessment). CEM Incision (also know as downcutting or headcutting) can occur independently or simultaneously with meander migration. The bed is eroded and the base level of the stream is lowered. Downcutting increases bank height, which can eventually lead to bank failure and channel widening. Widening and downcutting continue until equilibrium is regained. Aggradation occurs when sediment supply exceeds transport capacity and the stream deposits sediment in the channel. Aggradation can be triggered by an increase in sediment supply due to upstream channel erosion or land development, or by a decrease in discharge, which reduces the transport capacity of the system. Deposition continues until a new state of dynamic equilibrium is achieved.
  2. Stream Design Approaches – Natural Channel Design – 3 design approaches 1)Analog 2)Empirical 3)Analytical. All 3 are part of the NCD process. Analog approaches use a stream in dynamic equilibrium as a template for design. This approach represents one of three approaches to NCD. Empirical design uses equations derived from regional data sets of various channel characteristics of dynamically stable streams. Analytical design makes use of hydraulic equations and sediment transport functions to derive equilibrium conditions. These three approaches must be given equal validity if the end product meets the above definition of stream design. 1- Analog / Reference Reach 2-Empirical: e.g. Regional Curves 3-Analytical:
  3. NCD process Dimension Plan Profile
  4. NCD process Hydrologic Analysis Hydraulic Analysis Bankfull Discharge
  5. Design strategies Priority 1 establish new channel at historic FP elev. Priority 2 Create New Floodplain and Stream Pattern Below the Historical Floodplain Elevation but Above Current Stream Elevation\ Priority 3 Widen FP at existing BF elev. Priority 4 Stabilize channel in place
  6. VICINITY MAP OF SITE.
  7. EX COND START POINT – JUST THE SITE
  8. EX COND – ADD STREAM AND WETLAND AND REACH DESIGNATION AND TREES.
  9. EX COND – STREAM ASSMNT BEHI TO INFOR THE DSGN – VERY HIGH
  10. EX COND – STREAM ASSMNT BEHI TO INFOR THE DSGN – HIGH
  11. EX COND – STREAM ASSMNT BEHI TO INFOR THE DSGN – MODERATE TO VERY LOW
  12. CONSTRAINTS – ESMTS, UTILITIES
  13. PROPOSED CHANNEL LAYOUT
  14. EVALUATE TREES AND DESIGN
  15. STRUCTURES DESIGN
  16. JUST ISOLATE THE PROPOSED STREAM FEATURES
  17. CREATION OF WETLAND OR MEADOW AREAS
  18. EVALUATE THE LOD – AREA NEEDED TO DO THE WORK
  19. ACCESS ROUTES
  20. STAGING AREAS
  21. VICINITY MAP OF SITE.
  22. Goose Creek – small trib
  23. Selma Estates constructed riffle
  24. Taft Ave. Riffle and modified CV aka Jhook