Transcript Lake Redstone Watershed and Lake Modeling Study

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