chetek lakes diagnostic and feasibility study barr engineering company august 2, 2009 annual meeting
TRANSCRIPT
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Chetek Lakes Diagnostic and
Feasibility StudyBarr Engineering Company
August 2, 2009 Annual Meeting
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Overview
• Lake Water Quality Basics
•Why Study?
• Study Details
•CLPA Volunteers Needed
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How Does Phosphorus Affect
WQ?Increase in Phosphorus
Increase in Algae
Lake gets Greener
Secchi Disc readingDecreases
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Phosphorus Sources
•Watershed
•Sediment
•Rainfall
•Groundwater
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How Do Sediments Add Phosphorus to
Lakes?Really low oxygen at bottom
Phosphorus released from sediments
Phosphorus mixed throughout lakefrom
Boats Wind
Fall Temperature Change
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Watershed Phosphorus Loading
Rain
Runoff
Phosphorus to Lake
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Why Study?
•Secchi Disc readings Decreased Since 1996 – Why?
•Lake Sediment Study Needed
•Lake on 303d list of impaired waters
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Study Details•Phase 1
•Habitat Study
•Monitoring
•Phase 2
•Internal Load Study
•Modeling
•Management Plan
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Phase 1
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DNR Habitat Maps•Aquatic Plant
Sensitive Areas
•Coarse Rock Rubble Habitat Areas for Walleyes
•Coarse woody debris habitat
•Shoreline buffers/restoration areas
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Sediment Monitoring - Barr
•Mud - 7 cores
•Prairie – 18 cores
•Pokegama – 7 cores
•Chetek – 8 cores
•Ten Mile – 6 cores
•Total of 46 cores
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Sediment Monitoring - Barr
•Discover exactly how much phosphorus is in the lake sediments by measuring it
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Tributary Monitoring - USGS
•Flow – 2 years
•Phosphorus – 1 year
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Lake Monitoring
•7 Times Per Year – USGS
•Volunteers – Weekly – June-Sept.
•Chetek – 2 years
•Other Lakes – 1 year
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Other Monitoring - USGS
•Recording Stage Gage
•Recording Precipitation Gages
•10 Groundwater Piezometers
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Phase 2
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Phase 2 – Internal Phosphorus Load
Study
•Phosphorus release rates – low oxygen or high pH
•Boat propellor resuspension
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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?
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Management Plan
•Set Goals
•Watershed Management
•Internal Load Management
•Habitat Management
•Committee & Public Meetings
•CLPA Approval, WDNR Approval
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What comes next?
•Projects from the management plan
•Projects that improve water quality
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Schedule
•Phase 1 - 2010 to 2013
•Phase 2 - 2011 to 2013
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Study Cost
•About $290,000 for Phase 1
•Estimate Similar Cost for Phase 2
•About $580,000 for Study
•About $116,000 per lake
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Funding Sources
•Two DNR Lake Protection Grants of $200,000 Each
•USGS Funds 35% of USGS Project
•CLPA $10,000 for Each Phase
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CLPA Cost
•About $10,000 for Phase 1
•About $10,000 for Phase 2
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Volunteers Needed
•Lake Sampling
•Stream Sampling
•Sediment Sampling
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Support
•Contact CLPA President John Plaza
•Support?
•Feedback?
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Next Steps•Meet With
DNR
•Apply for Lake Protection Grant Funds
•Find Volunteers
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