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Chetek Lakes Diagnostic and Feasibility Study

Chetek Lakes Diagnostic and Feasibility Study. Barr Engineering Company August 2, 2009 Annual Meeting. Overview. Lake Water Quality Basics Why Study? Study Details CLPA Volunteers Needed. How Does Phosphorus Affect WQ?. Increase in Phosphorus. Increase in Algae. Lake gets Greener.

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Chetek Lakes Diagnostic and Feasibility Study

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  1. Chetek Lakes Diagnostic and Feasibility Study Barr Engineering Company August 2, 2009 Annual Meeting

  2. Overview • Lake Water Quality Basics • Why Study? • Study Details • CLPA Volunteers Needed

  3. How Does Phosphorus Affect WQ? Increase in Phosphorus Increase in Algae Lake gets Greener Secchi Disc reading Decreases

  4. Phosphorus Sources • Watershed • Sediment • Rainfall • Groundwater

  5. How Do Sediments Add Phosphorus to Lakes? Really low oxygen at bottom Phosphorus released from sediments Phosphorus mixed throughout lake from Boats Wind Fall Temperature Change

  6. Watershed Phosphorus Loading Rain Runoff Phosphorus to Lake

  7. Why Study? • Secchi Disc readings Decreased Since 1996 – Why? • Lake Sediment Study Needed • Lake on 303d list of impaired waters

  8. Study Details • Phase 1 • Habitat Study • Monitoring • Phase 2 • Internal Load Study • Modeling • Management Plan

  9. Phase 1

  10. DNR Habitat Maps • Aquatic Plant Sensitive Areas • Coarse Rock Rubble Habitat Areas for Walleyes • Coarse woody debris habitat • Shoreline buffers/restoration areas

  11. Sediment Monitoring - Barr • Mud - 7 cores • Prairie – 18 cores • Pokegama – 7 cores • Chetek – 8 cores • Ten Mile – 6 cores • Total of 46 cores

  12. Sediment Monitoring - Barr • Discover exactly how much phosphorus is in the lake sediments by measuring it

  13. Tributary Monitoring - USGS • Flow – 2 years • Phosphorus – 1 year

  14. Lake Monitoring • 7 Times Per Year – USGS • Volunteers – Weekly – June-Sept. • Chetek – 2 years • Other Lakes – 1 year

  15. Other Monitoring - USGS • Recording Stage Gage • Recording Precipitation Gages • 10 Groundwater Piezometers

  16. Phase 2

  17. Phase 2 – Internal Phosphorus Load Study • Phosphorus release rates – low oxygen or high pH • Boat propellor resuspension

  18. Modeling Components • How much Water enters the lake? • How much Phosphorus enters the lake? • Where does the Phosphorus come from? • How much can Water Quality improve?

  19. Management Plan • Set Goals • Watershed Management • Internal Load Management • Habitat Management • Committee & Public Meetings • CLPA Approval, WDNR Approval

  20. What comes next? • Projects from the management plan • Projects that improve water quality

  21. Schedule • Phase 1 - 2010 to 2013 • Phase 2 - 2011 to 2013

  22. Study Cost • About $290,000 for Phase 1 • Estimate Similar Cost for Phase 2 • About $580,000 for Study • About $116,000 per lake

  23. Funding Sources • Two DNR Lake Protection Grants of $200,000 Each • USGS Funds 35% of USGS Project • CLPA $10,000 for Each Phase

  24. CLPA Cost • About $10,000 for Phase 1 • About $10,000 for Phase 2

  25. Volunteers Needed • Lake Sampling • Stream Sampling • Sediment Sampling

  26. Support • Contact CLPA President John Plaza • Support? • Feedback?

  27. Next Steps • Meet With DNR • Apply for Lake Protection Grant Funds • Find Volunteers

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