Turkey Run at Langley High School Stream Restoration Public Meeting
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This document summarizes a public meeting to discuss plans for a stream restoration project on Turkey Run at Langley High School. The meeting outlined Fairfax County's stormwater management efforts, presented the objectives and existing conditions of the project site, and provided examples of previous stream restoration projects. Attendees were invited to ask questions about the conceptual design, next steps, and natural channel design approach for the Turkey Run project.
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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
- 16. Stream Design Approaches Natural Channel Design 3 design approaches 1)Analog 2)Empirical 3)Analytical
- 20. Turkey Run at Langley High School Stream Restoration Concept Design
- 35. Examples
- 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
- 40. Step Pool
- 41. Infill mix comprised of cobbles, gravels, sand, silt, topsoil Larger material, usually cobble Constructed Riffle (aka Reinforced Streambed)
- 42. Riffle
- 43. Access
- 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
- 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.
- 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:
- NCD process Dimension Plan Profile
- NCD process Hydrologic Analysis Hydraulic Analysis Bankfull Discharge
- 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
- VICINITY MAP OF SITE.
- EX COND START POINT – JUST THE SITE
- EX COND – ADD STREAM AND WETLAND AND REACH DESIGNATION AND TREES.
- EX COND – STREAM ASSMNT BEHI TO INFOR THE DSGN – VERY HIGH
- EX COND – STREAM ASSMNT BEHI TO INFOR THE DSGN – HIGH
- EX COND – STREAM ASSMNT BEHI TO INFOR THE DSGN – MODERATE TO VERY LOW
- CONSTRAINTS – ESMTS, UTILITIES
- PROPOSED CHANNEL LAYOUT
- EVALUATE TREES AND DESIGN
- STRUCTURES DESIGN
- JUST ISOLATE THE PROPOSED STREAM FEATURES
- CREATION OF WETLAND OR MEADOW AREAS
- EVALUATE THE LOD – AREA NEEDED TO DO THE WORK
- ACCESS ROUTES
- STAGING AREAS
- VICINITY MAP OF SITE.
- Goose Creek – small trib
- Selma Estates constructed riffle
- Taft Ave. Riffle and modified CV aka Jhook