Woodglen Lake Dredging and Restoration Department of Public Works and Environmental Services

1. Woodglen Lake Dredging and Restoration
Department 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
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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 Alternatives
1. Mechanically dredge deposited
sediment and haul wet
2. Drain lake and dry deposited
sediment in place before hauling

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. Lake Barton Example: Pre-Dredging

12. Lake Barton Example: Dredging in Progress
DREDGING:
Dredging took
place without
draining the lake.

13. Lake Barton Example: Dredging in Progress

14. Lake Barton Example: Completed Project

15. Lake Needwood Example
Lake Needwood:
Montgomery County, MD
Dredging:
The lake was drained and the
sediment 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 Lake
Dredging:
32,500 Cubic
Staging Area
Yards

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. Chesapeake Bay Preservation Areas
 Buffer Restoration

22. Woodglen Lake: Shoreline Restoration

23. Woodglen Lake: Shoreline Restoration
Woodglen
Lake Existing
Conditions

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 Lake
Woodglen Lake
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©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 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: