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Woodglen Lake Dredging and Restoration

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Woodglen Lake Dredging and Restoration

  1. 1. Woodglen Lake Dredging and Restoration Department of Public Works and Environmental Services
  2. 2. Woodglen Lake Facts  Lake Surface Area = 12.5 acres  Sediment Pool Capacity = 160,000 cubic yards (CY)  Current sediment in lake = 32,500 CY  Estimated annual sediment load 17 feet = 1,244 CY 32,500 CY
  3. 3. Watershed  Drainage Area = 740 acres (1.15 square miles)  Pohick Creek Watershed  Sideburn Branch
  4. 4. Woodglen Lake
  5. 5. Woodglen Lake: Sediment Thickness
  6. 6. Woodglen Lake: Water Depth
  7. 7. Woodglen Lake: Dewatering Basin Inactive Dewatering Basin Available Exclusively by DigitalGlobe ©2013 Microsoft Corporation © 2012 Nokia
  8. 8. Lake Restoration and Dredging Project  Project Goals  Restore sediment pool capacity  Downstream water quality benefits  Lake water quality  Esthetics  Improve lake water quality and habitat  Stabilize stream segment  Provide long term maintenance improvements
  9. 9. Dredging Alternatives 1. Mechanically dredge deposited sediment and haul wet 2. Drain lake and dry deposited sediment in place before hauling
  10. 10. Lake Barton Example PRE-DREDGING: An estimated 35,000 cubic yards of sediment had accumulated in the lake, forming islands and reducing water levels to less than three feet in most areas.
  11. 11. Lake Barton Example: Pre-Dredging
  12. 12. Lake Barton Example: Dredging in Progress DREDGING: Dredging took place without draining the lake.
  13. 13. Lake Barton Example: Dredging in Progress
  14. 14. Lake Barton Example: Completed Project
  15. 15. Lake Needwood Example Lake Needwood: Montgomery County, MD Dredging: The lake was drained and the sediment was dried in-place.
  16. 16. Lake Needwood Example: Dredging
  17. 17. Dredge Alternative – In the Wet  General Sequence  Establish access and staging areas  Conduct dredging utilizing barges  Haul wet sediment to disposal site for drying  Benefits  Less weather dependent  Quicker initial start to dredging  Less potential for schedule extensions or delay  Concerns  Increased sediment handling effort at disposal area  Potentially higher cost
  18. 18. Dredge Alternative – In the Dry  General Sequence  Initiate drawdown of lake  Establish access and staging areas  Establish diversion channels within lake  Conduct dredging  Benefits  Higher daily sediment removal rates  Minimal sediment handling effort at disposal area  Potentially lower cost  Concerns  Very weather dependent  Higher potential for delays due to weather  Typically more odor from entire lake bottom being exposed  Need to relocate/salvage fish
  19. 19. Woodglen Lake Dredging: 32,500 Cubic Staging Area Yards
  20. 20. Lake Restoration  In-lake forebay  Wetland planting  Shoreline stabilization  Fish habitat  Fish stocking Fish habitat created from salvaged trees Lake Barton: Fish stocking by Virginia Game and Inland Fisheries
  21. 21. Chesapeake Bay Preservation Areas  Buffer Restoration
  22. 22. Woodglen Lake: Shoreline Restoration
  23. 23. Woodglen Lake: Shoreline Restoration Woodglen Lake Existing Conditions
  24. 24. Shoreline Protection Options
  25. 25. Fish Habitat Structures
  26. 26. Stream Stabilization
  27. 27. Woodglen Lake: Site Access & Staging
  28. 28. Access During Construction  Lake Barton
  29. 29. Huntsman Lake Woodglen Lake Available Exclusively by DigitalGlobe ©2013 Microsoft Corporation © 2012 Nokia 2011
  30. 30. Woodglen Lake Dredging and Restoration Project Timeline and Coordination  Community coordination at Design and Construction phase  June 2013: Final Design  July 2013: Construction bid advertisement  September/October 2013: Begin dredging  Project duration: 6 - 7 months  Lake may be drained for entire project (dredging method depends on project bidding)  Partial lake drawdown alternative to be evaluated
  31. 31. Woodglen Lake Dredging and Restoration Contacts  Dipmani Kumar, Project Manager  703-324-4612  Dipmani.kumar@fairfaxcounty.gov  Matt Meyers, Branch Chief  703-324-5651  Matthew.meyers@fairfaxcounty.gov  Partners:

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