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
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
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.email@example.com Matt Meyers, Branch Chief 703-324-5651 Matthew.firstname.lastname@example.org Partners: