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Paul Spring Segment 2 at Hollin Hills Stream Restoration Community Meeting Oct 2018

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The Hollin Hills community is introduced to the design process that is an important first step in learning about the Paul Spring stream restoration.

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Paul Spring Segment 2 at Hollin Hills Stream Restoration Community Meeting Oct 2018

  1. 1. A Fairfax County, VA, publication Department of Public Works and Environmental Services Working for You! Paul Spring Segment 2 at Hollin Hills Stream Restoration Project October 2018
  2. 2. Stormwater Planning Division Agenda Introduction to the Design Process Watershed Existing Conditions Next steps Contact information 2
  3. 3. Stormwater Planning Division Design Team • Community Members • Hollin Hills Civic Association • Land Acquisition • Stantec • Stormwater Planning • Utilities Design and Construction • Maintenance and Inspections • Urban Forestry • Wastewater 3
  4. 4. 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. 4
  5. 5. 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 • Public Safety /Emergency Response – Flooding – Snow Removal 5
  6. 6. Stormwater Planning Division Natural Channel Design (part 1) 6
  7. 7. Stormwater Planning Division Natural Channel Design (part 2) 7 Minimize tree loss Establish native vegetation Reconnect the floodplain
  8. 8. Little Hunting Creek Watershed • 7,067 acres in Fairfax County. • One of the most developed watersheds in Fairfax County. • Discharges into Potomac River. 8 https://www.fairfaxcounty.gov/publicworks/stormwater/little-hunting-creek-watershed Stormwater Planning Division
  9. 9. Stormwater Planning Division Unnamed Tributary Watershed 9
  10. 10. Stormwater Planning Division Historic Watershed Figure 2.2 Map of Little Hunting Creek drawn by General George Washington. From Little Hunting Creek Watershed Management Plan. 10
  11. 11. Environmental Benefits Improve watershed conditions and reduce downstream impacts through…. Controlling quantity Mitigate flooding where possible Controlling velocity Reduce erosion Protect infrastructure Improve buffer quality 11Stormwater Planning Division
  12. 12. Stormwater Planning Division Project Goals Restore up to 1,100 feet of stream in Brickelmaier 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 *improvements require easements 12
  13. 13. Project Area 13 Storm Outfall Popkins Ln. Stormwater Planning Division Area of flooding Paul Spring Rd. Soil type: highly erosive, poor drainage
  14. 14. Stormwater Planning Division Existing Conditions 14 Bank erosion sends sediment and nutrients downstream.
  15. 15. Stormwater Planning Division Existing Conditions 15 Bank erosion sends sediment and nutrients downstream.
  16. 16. 16 Existing Conditions Erosion can undermine the bank, causing mass wasting. Stormwater Planning Division
  17. 17. Stormwater Planning Division Existing Conditions 17 Lack of vegetation can cause bank failure.
  18. 18. Stormwater Planning Division Existing Conditions 18 Deep V-shaped channels like this one do not get better on their own.
  19. 19. 19 Existing Conditions Stormwater Planning Division Flash flooding causes trail and tree washouts/loss of recreational value.
  20. 20. 20 Existing Conditions Stormwater Planning Division Stream is forced into a culvert at lower end.
  21. 21. 21 Non-native invasive species, like English ivy, are dominant in the stream valley. Existing Conditions Stormwater Planning Division
  22. 22. 22 Non-native invasive species, like English ivy, can limit revegetation success. Existing Conditions Stormwater Planning Division
  23. 23. Stormwater Planning Division Typical Structures Used – Cross Vanes 23
  24. 24. Stormwater Planning Division Typical Structures Used – Root Wads 24
  25. 25. Stormwater Planning Division Video of Typical Structures Used 25
  26. 26. Stormwater Planning Division Construction Example 26
  27. 27. Stormwater Planning Division Construction Example 27
  28. 28. Stormwater Planning Division Construction Example 28
  29. 29. Stormwater Planning Division Construction Example 29
  30. 30. Stormwater Planning Division Construction Example 30
  31. 31. Stormwater Planning Division Construction Example 31
  32. 32. Stormwater Planning Division Growing Season Following Construction Completion 32
  33. 33. Stormwater Planning Division One Year After Construction Completion 33
  34. 34. Stormwater Planning Division Three Years After Construction Completion 34
  35. 35. 35 Before and After Examples Big Rocky Run II Before 1 year After Stormwater Planning Division
  36. 36. 36 Before and After Examples Rabbit Branch Before 2 years After Stormwater Planning Division
  37. 37. Before and After Examples 37 Banks Park Before 3 years After Stormwater Planning Division
  38. 38. Before and After Examples 38 Gil McCutcheon Park Before 4 years After Stormwater Planning Division
  39. 39. Stormwater Planning Division 39 Next Steps – Schedule • Complete Stream Assessment –December 2018 • Conceptual Design – February/March 2019 • 35% Plan Set • Charrette and Public Input Meeting • Land rights are secured – December 2018 • Easements must be obtained for project to continue • Revisions, Refinements and Required Elements • Design Complete – 2019 • Public Information Meeting • Construction – Dependent upon future funding
  40. 40. Stormwater Planning Division 40 Next Steps – Advisory Committee • Volunteers from Civic Association, neighborhood to serve on the Advisory Committee (up to 4) • Meetings are held Monday-Friday • Meetings are held at 12000 Government Center Parkway • Meetings are held between 9 and 4 • Be a member of the design team • Approximately 4 meetings, spaced throughout the project • Can’t join us for regular meetings? Sign up for the email list (email addresses will be seen by other members) for periodic updates as the project progresses
  41. 41. Online Resources 41 Stormwater Planning Division Website https://www.fairfaxcounty.gov/publicworks/stormwater Fairfax County Watershed Planning https://www.fairfaxcounty.gov/publicworks/stormwater/watersheds EPA Water Quality Laws and Regulations http://www.epa.gov/water/laws.html Stormwater Planning Division
  42. 42. Stormwater Planning Division Contact Information Design Meghan Fellows– Project Manager 703-324-5807 Meghan.Fellows@fairfaxcounty.gov Fairfax County 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 42

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