Woodglen Lake Dredging and Restoration

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Woodglen Lake Dredging and Restoration …

Woodglen Lake Dredging and Restoration

Department of Public Works and Environmental Services

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  • 1. Woodglen Lake Dredging and RestorationDepartment of Public Works and Environmental Services
  • 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. Watershed Drainage Area = 740 acres (1.15 square miles) Pohick Creek Watershed Sideburn Branch
  • 4. Woodglen Lake
  • 5. Woodglen Lake: Sediment Thickness
  • 6. Woodglen Lake: Water Depth
  • 7. Woodglen Lake: Dewatering Basin Inactive Dewatering Basin Available Exclusively by DigitalGlobe ©2013 Microsoft Corporation © 2012 Nokia
  • 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. Dredging Alternatives1. Mechanically dredge deposited sediment and haul wet2. Drain lake and dry deposited sediment in place before hauling
  • 10. Lake Barton ExamplePRE-DREDGING:An estimated35,000 cubic yardsof sediment hadaccumulated inthe lake, formingislands andreducing waterlevels to less thanthree feet in mostareas.
  • 11. Lake Barton Example: Pre-Dredging
  • 12. Lake Barton Example: Dredging in ProgressDREDGING:Dredging tookplace withoutdraining the lake.
  • 13. Lake Barton Example: Dredging in Progress
  • 14. Lake Barton Example: Completed Project
  • 15. Lake Needwood Example Lake Needwood: Montgomery County, MDDredging:The lake was drained and thesediment was dried in-place.
  • 16. Lake Needwood Example: Dredging
  • 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. 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. Woodglen LakeDredging:32,500 Cubic Staging AreaYards
  • 20. Lake Restoration In-lake forebay Wetland planting Shoreline stabilization Fish habitat Fish stockingFish habitat created from salvaged trees Lake Barton: Fish stocking by Virginia Game and Inland Fisheries
  • 21. Chesapeake Bay Preservation Areas Buffer Restoration
  • 22. Woodglen Lake: Shoreline Restoration
  • 23. Woodglen Lake: Shoreline RestorationWoodglenLake ExistingConditions
  • 24. Shoreline Protection Options
  • 25. Fish Habitat Structures
  • 26. Stream Stabilization
  • 27. Woodglen Lake: Site Access & Staging
  • 28. Access During Construction Lake Barton
  • 29. Huntsman LakeWoodglen Lake Available Exclusively by DigitalGlobe ©2013 Microsoft Corporation © 2012 Nokia 2011
  • 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. Woodglen Lake Dredging and RestorationContacts Dipmani Kumar, Project Manager  703-324-4612  Dipmani.kumar@fairfaxcounty.gov Matt Meyers, Branch Chief  703-324-5651  Matthew.meyers@fairfaxcounty.gov Partners: