Little Pimmit Run at Chesterbrook Road Stream Restoration Project - April 2021
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Restore up to 7,100 feet of stream channel and connecting tributaries Reduce sediment transport Protect existing infrastructure Coordinate with Little Pimmit Run Sewer Realignment Project Maintain close coordination with stakeholders
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Little Pimmit Run at Chesterbrook Road Stream Restoration Project - April 2021
- 1. A Fairfax County, VA, publication Department of Public Works and Environmental Services Working for You! Little Pimmit Run at Chesterbrook Road Stream Restoration Project April 2021 April 22, 2021
- 2. Agenda Vicinity Maps Project Goals Social Goals Program Drivers Environmental Benefits Typical Structures 2 Existing Conditions Construction Examples Completed Work Design Next Steps Contact Information Stormwater Planning Division
- 3. Vicinity Map (Big Picture) 3 Stormwater Planning Division
- 4. 4 Vicinity Map (Phase 1) Stormwater Planning Division
- 5. 5 Vicinity Map (Phase 2) Stormwater Planning Division
- 6. 6 Project Goals 1. Restore up to 7,100 feet of stream channel and connecting tributaries – Reduce sediment transport 2. Protect existing infrastructure – Coordinate with Little Pimmit Run Sewer Realignment Project 3. Maintain close coordination with stakeholders Stormwater Planning Division
- 7. 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: – Fairfax County Public Works – Fairfax County Park Authority – Wetland Studies and Solutions, Inc. 7
- 8. 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 • Local TMDLs • Dam Safety Regulations • Maintenance of Existing Facilities • Public Safety /Emergency Response 8
- 9. 9 Environmental Benefits Improve watershed conditions and reduce downstream impacts through…. Control velocity • Reduce erosion • Protect infrastructure • Protect vegetation Restore riparian corridor Restore instream habitat Stormwater Planning Division
- 10. 10 Typical Structures Used – Cross Vanes Normal Flow Higher flows Higher flows Stormwater Planning Division
- 11. 11 Typical Structures Used – Root Wads Stormwater Planning Division
- 12. 12 Typical Structures Used – Boulder Clusters Stormwater Planning Division
- 13. 13 Typical Structures Used – Boulder Clusters Stormwater Planning Division
- 14. 14 Existing Bank Conditions – Phase 1 Stormwater Planning Division
- 15. 15 Existing Bank Conditions – Phase 1 Stormwater Planning Division
- 16. 16 Existing Bank Conditions – Phase 1 Stormwater Planning Division
- 17. 17 Existing Bank Conditions – Phase 1 Stormwater Planning Division
- 18. 18 Existing Bank Conditions – Phase 2 Stormwater Planning Division
- 19. 19 Existing Conditions – Phase 2 Stormwater Planning Division
- 20. 20 Existing Conditions – Phase 2 Stormwater Planning Division
- 21. 21 Existing Conditions – Phase 2 Stormwater Planning Division
- 22. 22 Existing Conditions – Phase 2 Stormwater Planning Division
- 23. Stormwater Planning Division 23 Construction Access Road
- 24. 24 Construction Example – Channel Grading Stormwater Planning Division
- 25. 25 Construction Example – Channel Grading
- 26. 26 Before and After Examples Flatlick Confluence January 2011 September 2015 Stormwater Planning Division
- 27. 27 After Construction Banks Park November 2014 September 2018
- 28. Proposed Design Alignments 28 Stormwater Planning Division Alignment #1 – Establishes a balance between using the existing channel while increasing curves in the proposed channel. Alignment #2 – Adds the most curves to the proposed channel. Alignment #3 – Utilizes the existing channel to the greatest degree (limited sections in phase 2) *All alignments largely utilize the existing over widened channel scar to minimize disturbance. Brown Dashed Line = Existing Channel Solid black line = Alignment #1 Solid blue line = Alignment #2 Solid orange line = Alignment #3
- 29. 29 Proposed Channel Alignments – Phase 1 Flow Stormwater Planning Division Brown Dashed Line = Existing Channel Solid black line = Alignment #1 Solid blue line = Alignment #2 X – Impacted tree
- 30. 30 Proposed Channel Alignments – Phase 1 Flow Brown Dashed Line = Existing Channel Solid black line = Alignment #1 Solid blue line = Alignment #2 X – Impacted tree
- 31. 31 Proposed Channel Alignments – Phase 1 Stormwater Planning Division Flow Brown Dashed Line = Existing Channel Solid black line = Alignment #1 Solid blue line = Alignment #2 X – Impacted tree
- 32. 32 Proposed Channel Alignments – Phase 2 Brown Dashed Line = Existing Channel Three solid black lines = Alignment #1 Shaded blue area = Alignment #2 Flow X – Impacted tree
- 33. 33 Proposed Channel Alignments – Phase 2 Flow Brown Dashed Line = Existing Channel Solid black line = Alignment #1 Solid blue line = Alignment #2 Solid orange line = Alignment #3 X – Impacted tree
- 34. 34 Proposed Channel Alignments – Phase 2 Flow Brown Dashed Line = Existing Channel Solid black line = Alignment #1 Solid blue line = Alignment #2 Solid orange line = Alignment #3
- 35. 35 Proposed Channel Alignments – Phase 2 Flow Brown Dashed Line = Existing Channel Solid black line = Alignment #1 Solid blue line = Alignment #2 Solid orange line = Alignment #3 X – Impacted tree
- 36. 36 Proposed Channel Alignments – Phase 2 Flow Brown Dashed Line = Existing Channel Solid black line = Alignment #1 Solid blue line = Alignment #2 X – Impacted tree
- 37. 37 Schedule • Concept design submission – September 2021 • Concept design community meeting – November 2021 • Land Acquisition – Easements required prior to final design • Construction – To be determined Pending date of completed design Stormwater Planning Division • Community meeting on Pre-design/Channel alignments – April 22, 2021
- 38. 38 Contact Information Contact Information Design Fred Wilkins – Project Manager 703-509-0511 Fred.Wilkins@fairfaxcounty.gov Stormwater Planning Division 703-324-5500, TTY 711 12000 Government Center Parkway Suite 449 Fairfax, Virginia 22035 www.fairfaxcounty.gov/publicworks/stormwater To request this information in an alternate format call 703-324-5500, TTY 711 Stormwater Planning Division
- 39. Online Resources 39 Stormwater Planning Division Website https://www.fairfaxcounty.gov/publicworks/stormwater/ Northern Virginia Soil and Water Conservation District http://www.fairfaxcounty.gov/nvswcd/newsletter/planning.htm Middle Potomac Watersheds Management Plan (Includes Pimmit Run) https://www.fairfaxcounty.gov/publicworks/stormwater/middle-potomac-watersheds Stormwater Planning Division Little Pimmit Run at Chesterbrook Road Stream Restoration and Stormwater Improvement Project Little Pimmit Run at Chesterbrook Road Stream Restoration (SD-000031-246) | Public Works and Environmental Services (fairfaxcounty.gov)
- 40. 40 Questions?