Coon Branch at Annandale Community Park-Stream Restoration Project

1. A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
Coon Branch
at Annandale Community Park
Stream Restoration Project
April 2017

2. Stormwater Planning Division
Agenda
Social Goals
Program Drivers
Watershed
Environmental Benefits
Existing Conditions
Next steps
Contact information
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3. Stormwater Planning Division
Social Goals
1. Maintain open dialog and share information.
2. Coordinate with all the stakeholders and the community.
3. Build partnerships with local organizations such as
Homeowners Associations.
4. Design Team – Stantec Consulting Services, Stormwater
Planning Division, Urban Forest Management Division, Park
Authority, and Utilities Design and Construction Division.
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4. Stormwater Planning Division
Stormwater Program Drivers
• Municipal Separate Storm Sewer Permit (MS-4)
• Chesapeake Bay Total Maximum Daily Loads (TMDL)
– Regulates amount of pollutants in waterways (Nitrogen, Phosphorus, and
Total Suspended Solids )
• Local TMDLs (sediment, bacteria, and PCBs)
• Maintenance of Existing Facilities
• Dam Regulations
• Public Safety /Emergency Response
– Flooding
– Snow Removal
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5. Accotink Creek Watershed
• 52 sq. mi. in Fairfax County.
• There are a total of 16 sub-
watersheds and 7 major
tributaries within the
Accotink Creek watershed.
• Accotink Creek discharges
into Accotink Bay.
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http://www.fairfaxcounty.gov/dpwes/watersheds/accotinkcreek.htm
Stormwater Planning Division

6. Environmental Benefits
Improve watershed conditions and reduce downstream
impacts through….
Controlling quantity
Mitigate flooding where possible
Controlling velocity
Reduce erosion
Protect infrastructure
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7. Stormwater Planning Division
Project Goals
Restore up to 1,900 feet of stream in Annandale Community Park
Stabilize streambed and banks
Reduces sediment and nutrient inputs into stream system
Improve habitat
Protect Infrastructure (sanitary, water, etc.)
Maintain close coordination with stakeholders
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8. Project Area Limits
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Championship Dr.
Lafayette Village Dr.
Hirst Dr. Estabrook Dr.
Approximate limits of disturbance
Stormwater Planning Division
Hummer Rd.

9. Stormwater Planning Division
Existing Conditions
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10. Stormwater Planning Division
Existing Bank Conditions
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Existing Bank Conditions
Stormwater Planning Division

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Existing Bank Conditions
Erosion undermines tree. Tree becomes unstable and leans.
Stormwater Planning Division

13. 13
The tree falls down once roots are unable to compensate for the lack of support.
Existing Bank Conditions
Stormwater Planning Division

14. Existing Infrastructure
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Sanitary Sewer Manhole
Stormwater Pipe

15. Stormwater Planning Division
Typical Structures Used – Cross Vanes
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16. Stormwater Planning Division
Typical Structures Used – Root Wads
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17. Stormwater Planning Division
Video of Typical Structures Used
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18. Stormwater Planning Division
Construction Example
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19. Stormwater Planning Division
Construction Example
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20. Stormwater Planning Division
Construction Example
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21. Stormwater Planning Division
Construction Example
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22. Stormwater Planning Division
Construction Example
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23. Stormwater Planning Division
Construction Example
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24. Stormwater Planning Division
Growing Season Following Construction Completion
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25. Stormwater Planning Division
One Year After Construction Completion
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26. Stormwater Planning Division
Three Years After Construction Completion
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27. Before and After Examples
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Banks Park
Before After
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Before and After Examples
Big Rocky Run II
Before After
Stormwater Planning Division

29. 29
Before and After Examples
Rabbit Branch
Before
After
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30. Stormwater Planning Division 30
Next Steps – Schedule
• Complete Stream Assessment – May 2017
• Conceptual Design – September 2017
• Design Complete – 2019
• Construction – Dependent upon future funding

31. Online Resources
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Stormwater Planning Division Website
http://www.fairfaxcounty.gov/dpwes/stormwater/
Fairfax County Watershed Planning
http://www.fairfaxcounty.gov/nvswcd/newsletter/planning.htm
Accotink Creek Watershed Plan
http://www.fairfaxcounty.gov/dpwes/watersheds/accotinkcreek.htm
EPA Water Quality Laws & Regulations
http://www.epa.gov/water/laws.html
Stormwater Planning Division

32. Stormwater Planning Division
Contact Information
Contact Information
Design
Jasdeep Saini – Project Manager
703-324-5675
Jasdeep.Saini@fairfaxcounty.gov
Fairfax County Stormwater Planning Division
703-324-5500 TTY 711
12000 Government Center Parkway
Suite 449
Fairfax, Virginia 22035
www.fairfaxcounty.gov/dpwes/stormwater
To request this information in an alternate format call 703-324-5500, TTY 711
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