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ROCK KOSHKONONG LAKE DISTRICT Lake Dredging Project

ROCK KOSHKONONG LAKE DISTRICT Lake Dredging Project. Lake Koshkonong Dredging Project Phases of Work. PHASE I Establish goals and objectives Confirm funding sources Assess feasibility of obtaining permits PHASE II Confirm areas and sequence of dredging

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ROCK KOSHKONONG LAKE DISTRICT Lake Dredging Project

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  1. ROCK KOSHKONONG LAKE DISTRICT Lake Dredging Project

  2. Lake Koshkonong Dredging ProjectPhases of Work • PHASE I • Establish goals and objectives • Confirm funding sources • Assess feasibility of obtaining permits • PHASE II • Confirm areas and sequence of dredging • Assess physical and chemical characteristics of sediment • Confirm disposal methods and areas • Prepare options analysis • Prepare dredging plans and specifications • Obtain permits • PHASE III • Competitive bidding process • Services During Construction (as requested)

  3. RSV ENGINEERING, INC. Illustrations & photos courtesy of Keene Engineering

  4. RSV ENGINEERING, INC. Illustrations & photos courtesy of Keene Engineering

  5. RSV ENGINEERING, INC. Illustrations & photos courtesy of Keene Engineering

  6. RSV ENGINEERING, INC. Illustrations & photos courtesy of Keene Engineering

  7. RSV ENGINEERING, INC. Illustrations & photos courtesy of Keene Engineering

  8. General Information Regarding Hydraulic Dredging • A 8”-10” hydraulic dredge (diameter of discharge hose) can dredge 100-125 cubic yards per hour. • A 12”-14” hydraulic dredge can dredge up to 500 cubic yards per hour. • A lake the size of Lake Koshkonong may require the use of multiple dredges. • The cutter head is guided through the use of GPS, underwater cameras, and visual aids. • Slurry (sediment & water) can be pumped about 3,000 feet before a booster pump is required.

  9. General Information Regarding Hydraulic Dredging • Slurry is generally pumped at a min. flow rate of 14 feet/sec to allow transport of gravelly material. • Slurry can be pumped into sedimentation basins, lake structures, or geo-bags. It can also be transported to landfills, farm fields, etc. • The umbilical (discharge hose) will be floated for several hundred feet before going under the water. • Fishing will be impacted in the close proximity to the dredge. • Hydraulic dredging minimizes turbidity (suspended solids) in the water over the use of alternative dredging methods.

  10. Dredge Rates

  11. Dredge Rates

  12. Dredge Rates

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