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Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
Royal Lake Dredging and Restoration
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Royal Lake Dredging and Restoration

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Royal Lake Dredging and Restoration …

Royal Lake Dredging and Restoration

Fairfax County Department of Public Works and Environmental Services

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  • 1.  Dredging Program and Project Background Project Benefits Royal Lake Conditions Phased Approach Dredging Methods and Alternatives Park Access and Community Coordination Next StepsRoyal Lake: Meeting Agenda
  • 2.  History– Lakes previously dredged by DPWES Stormwater– Limited to small quantities– Dewatered on site Lake Barton completed in 2011 Currently working on:– Huntsman Lake, Woodglen Lake, Royal LakeDredging and Lake Restoration Program
  • 3.  Completed Data Collection Developing Lake Dredging and Management Plan Community coordination at design and constructionphases– Preliminary Design (65%)– Final Design (95%)– Preconstruction: Pardon Our Dust meeting December 2013: Final Design Construction in Fiscal Year 2015 (July 2014)Royal Lake Dredging and RestorationProject Timeline and Coordination
  • 4.  Restore sediment pool capacity– Downstream water quality benefits– Lake water quality– Aesthetics Improve lake water quality and habitat Provide long term maintenance improvementsProject Goals and Benefit
  • 5. Lake Barton Dredging and RestorationArea Treated(acres)Phosphorous Removal Nitrogen Removal Sediment Removal544 77,000 lbs dredged 115,500 lbs dredged 38,500 tons dredgedAnnual benefit fromincreased trappingefficiency130 lbs/year 200 lbs/year 65 tons/year
  • 6. Royal Lake Facts Drainage area =2,477 acres (3.67 square miles) Lake surface area =37.5 acres Sediment pool capacity =416,000 cubic yards (CY) Current sediment in lake =100,400 CY Estimated annual sediment load =4,400 CY50 feet100,400 CY
  • 7. Royal Lake
  • 8. Royal Lake: Sediment Thickness
  • 9. Royal Lake: Water Depth
  • 10. Royal Lake: Dredging Areas Phase 1: Base Dredge = 40,000 CY Phase 2: Up to an additional 60,000 CYZone D12,400 CY
  • 11. Royal Lake: Partial Drawdown
  • 12. Dredging Methods and Alternatives1. Mechanically dredgedeposited sediment andhaul wet2. Drain lake and drydeposited sediment inplace before hauling
  • 13. PRE-DREDGING:An estimated35,000 cubic yardsof sediment hadaccumulated inthe lake, formingislands andreducing waterlevels to less thanthree feet in mostareas.Lake Barton Example
  • 14. Lake Barton Example: Pre-Dredging
  • 15. LakeBartonExample: DredginginProgressDredging:Dredging tookplace withoutdraining the lake.
  • 16. LakeBartonExample: DredginginProgress
  • 17. Lake Barton Example: Disposal Site
  • 18. North Park Lake Example Allegheny County, PennsylvaniaDredging:The lake was drainedand the sediment wasdried in-place.
  • 19. North Park Lake Example Allegheny County, PennsylvaniaTemporary DiversionChannelsEquipment Workingon Next Slide
  • 20. North Park Lake: Dredging Allegheny County, PennsylvaniaTruck WashTemporaryDiversion ChannelLow PressureExcavatorBulldozerBulldozerExcavatorand DozerTruck AccessStaging
  • 21.  General Sequence– Establish access and staging areas– Conduct dredging utilizing barges– Haul wet sediment to disposal sitefor drying Benefits– Less weather dependent– Quicker initial start to dredging– Less potential for scheduleextensions or delay Concerns– Increased sediment handling effortat disposal area– Potentially higher costDredge Alternative – In the Wet
  • 22.  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 disposalarea– Potentially lower cost Concerns– Very weather dependent– Higher potential for delays due to weather– Typically more odor from sediment exposed– Need to relocate/salvage fishDredge Alternative – In the Dry
  • 23.  In-lake forebay Wetland planting Shoreline stabilization Fish habitat Fish stockingLake RestorationFish habitat createdfrom salvaged treesLake Barton:Fish stocking by Virginia Game and Inland Fisheries
  • 24. Royal Lake: Shoreline Restoration
  • 25. Royal Lake: Shoreline RestorationRoyal LakeExistingConditions
  • 26. Shoreline Protection Options
  • 27. Fish Habitat Structures
  • 28. Royal Lake: Site Access and StagingOptional?
  • 29. Royal Lake: Site Access and Staging
  • 30. Staging Area 1 Potential ExpansionBerm/Cofferdamto be builtArea to be dewatered andbackfilled to expand stagingarea after berm/cofferdamis built
  • 31. Royal Lake: Dewatering BasinInactiveDewatering Basin
  • 32. Access During ConstructionPublic Access:The park will remainopen and existingparking lot will beavailable.
  • 33. Access During ConstructionPublic Access:Pedestrian gates will beprovided. Accessthrough work areas andtrails around the lakeafter work hours.
  • 34.  Community coordination at design and construction phases– Preliminary Design (65%)– Final Design (95%)– Preconstruction: “Pardon Our Dust” meeting December 2013: Final Design Construction in Fiscal Year 2015 (Starts July 2014) Project Duration:– Phase 1, Base Dredge: Dredge 40,000 CY = 5 to 6 Months– Phase 2, Full Dredge: 9 to 12 MonthsRoyal Lake Dredging and RestorationProject Timeline and Coordination
  • 35. Contacts: Martin Chang, Project Manager703-324-5825 | Martin.Chang@fairfaxcounty.gov Dipmani Kumar, Section Chief703-324-4612 | Dipmani.Kumar@fairfaxcounty.gov http://www.fairfaxcounty.gov/dpwes/stormwater/Royal Lake DredgingandRestorationhttp://www.fairfaxcounty.gov/NVSWCD/ http://www.fairfaxcounty.gov/parks/

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