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Burandt Lake Burandt Lake TMDLTMDL
(Total Maximum Daily Load)(Total Maximum Daily Load)Water quality in an urban Water quality in an urban
lakelake
2/7/20082/7/2008
Objectives of this Objectives of this presentationpresentation
Why Burandt Lake is listed as impairedWhy Burandt Lake is listed as impaired Water Quality in Burandt LakeWater Quality in Burandt Lake
Watershed characteristicsWatershed characteristics Quality of waterQuality of water Plant communitiesPlant communities
Sources of pollution and SolutionsSources of pollution and Solutions Who will do what?Who will do what?
Local governmentLocal government YOU!YOU!
Impaired Water ListingImpaired Water Listing
Burandt Lake was added to the Burandt Lake was added to the impaired waters list in 2004impaired waters list in 2004
Designated use= Aquatic Recreation Designated use= Aquatic Recreation (swimming)(swimming)
Impaired for Excess Nutrients= too Impaired for Excess Nutrients= too much phosphorusmuch phosphorus
Why the lake is impairedWhy the lake is impaired
Average Total Phosphorus (ug/L)
0.0
20.0
40.0
60.0
80.0
100.0
1999 2000 2001 2004 2005
To
tal P
ho
sph
oru
s (u
g/L
)
Total phosphorus standard= 40 ug/L
32-66% Reduction in phosphorus needed to meet the standard
Sources of phosphorusSources of phosphorus“When it rains, it pollutes”“When it rains, it pollutes”
THINK WATERSHEDS!THINK WATERSHEDS!Source: Ron Struss, BWSR. “Lawns, Lakes, and Laws. 2002
Diagram not to scale
Epilimnion (Mixed Layer) warm, light water
Hypolimnion(cool, heavy water)
Thermocline(prevents mixing)
Metalimnion
0-4 meters
4-17 meters
Generalized Lake Ecosystem(Summertime Average Conditions)
Watershed Watershed Characteristics Characteristics Lake Waconia
7,147 Acres
Agriculture= 28%
Developed= 9%
Open Space= 63%
Scheuble Lake
430 Acres
Agriculture= 52%
Developed= 12%
Open Space= 40%
Burandt Lake
246 Acres
Agriculture= 1%
Developed= 55%
Open Space= 44%
Water QualityWater Quality
2005 Total Phosphorus
0
20
40
60
80
100
120
Tota
l Ph
osph
oru
s (u
g/L)
TP
High flow from Lake Waconia
Impacts from surrounding watershed and in-lake
In- lake and
Scheuble Lake
watershed
Trends in Water QualityTrends in Water Quality
Average Total Phosphorus (ug/L)
0.0
20.0
40.0
60.0
80.0
100.0
1999 2000 2001 2004 2005
To
tal P
ho
sph
oru
s (u
g/L
)
Aquatic Plant SurveysAquatic Plant Surveys
2005 Survey conducted by County staff2005 Survey conducted by County staff
Exotic Invasive Plants:Exotic Invasive Plants: Dense stands of eurasian watermilfoilDense stands of eurasian watermilfoil Moderate stands of curly leaf Moderate stands of curly leaf
pondweedpondweed
Native Plants:Native Plants:6 species6 species
ConclusionsConclusions
Must keep Lake Waconia healthy!Must keep Lake Waconia healthy! Focus on reducing storm water Focus on reducing storm water
runoff in Burandt Lake watershedrunoff in Burandt Lake watershed Ensure that spring flow from Ensure that spring flow from
Scheuble Lake has reduced Scheuble Lake has reduced phosphorus.phosphorus.
In-Lake Phosphorus must be In-Lake Phosphorus must be reduced!reduced!
External Phosphorus External Phosphorus SourcesSources
The PollutionThe Pollution Stormwater runoffStormwater runoff
ResidentialResidential Impervious surfaceImpervious surface AgricultureAgriculture
Failing/direct Failing/direct discharge septic discharge septic systemssystems
Degraded wetlandsDegraded wetlands
The SolutionThe Solution Buffers, shoreline Buffers, shoreline
restoration, infiltration restoration, infiltration ponds, rain gardens, ponds, rain gardens, rock inletsrock inlets
Upgrade you septic Upgrade you septic system and/or make system and/or make sure it is compliantsure it is compliant
Restore and protect Restore and protect wetlandswetlands
In-lake Phosphorus In-lake Phosphorus SourcesSources
The PollutionThe Pollution Anoxic sedimentAnoxic sediment Seasonal Seasonal
turnoverturnover Wind and boat Wind and boat
propeller mixingpropeller mixing Curly leaf Curly leaf
pondweedpondweed
The SolutionsThe Solutions Minimize boat Minimize boat
propeller action in propeller action in shallow areas of shallow areas of lakelake
Aquatic plant Aquatic plant managementmanagement
Chemical Chemical treatmentstreatments
What Local Government What Local Government Can DoCan Do
Help to coordinate local volunteers Help to coordinate local volunteers and effortsand efforts
Seek and/or provide funding for Seek and/or provide funding for projectsprojects
Make technical assistance availableMake technical assistance available EducationEducation Provide suppliesProvide supplies Offer project ideasOffer project ideas Provide media exposure/promotionProvide media exposure/promotion
What you can doWhat you can do Use zero phosphorus fertilizerUse zero phosphorus fertilizer - it’s the law! - it’s the law! Don’t sweep or blow leaves into the street- Don’t sweep or blow leaves into the street- they they
will end up in the storm sewer and then the lake.will end up in the storm sewer and then the lake. Install a Rain GardenInstall a Rain Garden – they catch runoff from – they catch runoff from
you yard and filter it.you yard and filter it. Use a Rain Barrel Use a Rain Barrel – they catch runoff from your – they catch runoff from your
roof and you can use the water to your gardenroof and you can use the water to your garden Install buffers- Install buffers- they reduce runoff of fertilizer they reduce runoff of fertilizer
from lawns and ag fields.from lawns and ag fields. Upgrade failing or direct discharge septic Upgrade failing or direct discharge septic
systemssystems Educate your neighbors!Educate your neighbors! Restore your shorelineRestore your shoreline -plant a native vegetation -plant a native vegetation
buffer.buffer.
Next Steps…Next Steps…
MPCA approval of TMDLMPCA approval of TMDL EPA approval of TMDLEPA approval of TMDL Design and implementation strategyDesign and implementation strategy Seek additional funding$$Seek additional funding$$
Be proactive!Be proactive! Stay involved!Stay involved!
Websites of InterestWebsites of Interest
http://www.co.carver.mn.us/tmdlshttp://www.co.carver.mn.us/tmdls
http://www.dnr.state.mn.us/lakefindhttp://www.dnr.state.mn.us/lakefind
http://www.pca.state.mn.us/data/http://www.pca.state.mn.us/data/edaWateredaWater
http://www.dnr.state.mn.us/grants/habitat/http://www.dnr.state.mn.us/grants/habitat/shoreland.htmlshoreland.html
Panfish64%Predators
2%
Rough Fish34%
Fish PopulationsFish Populations