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Burandt Lake TMDL (Total Maximum Daily Load) Water quality in an urban lake 2/7/2008.

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Presentation on theme: "Burandt Lake TMDL (Total Maximum Daily Load) Water quality in an urban lake 2/7/2008."— Presentation transcript:

1 Burandt Lake TMDL (Total Maximum Daily Load) Water quality in an urban lake 2/7/2008

2 Objectives of this presentation Why Burandt Lake is listed as impaired Why Burandt Lake is listed as impaired Water Quality in Burandt Lake Water Quality in Burandt Lake Watershed characteristics Watershed characteristics Quality of water Quality of water Plant communities Plant communities Sources of pollution and Solutions Sources of pollution and Solutions Who will do what? Who will do what? Local government Local government YOU! YOU!

3 Impaired Water Listing Burandt Lake was added to the impaired waters list in 2004 Burandt Lake was added to the impaired waters list in 2004 Designated use= Aquatic Recreation (swimming) Designated use= Aquatic Recreation (swimming) Impaired for Excess Nutrients= too much phosphorus Impaired for Excess Nutrients= too much phosphorus

4 Why the lake is impaired Total phosphorus standard= 40 ug/L 32-66% Reduction in phosphorus needed to meet the standard

5 Sources of phosphorus “When it rains, it pollutes” THINK WATERSHEDS! Source: Ron Struss, BWSR. “Lawns, Lakes, and Laws. 2002

6 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)

7 Watershed 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%

8 Water Quality High flow from Lake Waconia Impacts from surrounding watershed and in-lake In- lake and Scheuble Lake watershed

9 Trends in Water Quality

10 Aquatic Plant Surveys 2005 Survey conducted by County staff Exotic Invasive Plants: Dense stands of eurasian watermilfoil Dense stands of eurasian watermilfoil Moderate stands of curly leaf pondweed Moderate stands of curly leaf pondweed Native Plants: 6 species

11 Conclusions Must keep Lake Waconia healthy! Must keep Lake Waconia healthy! Focus on reducing storm water runoff in Burandt Lake watershed Focus on reducing storm water runoff in Burandt Lake watershed Ensure that spring flow from Scheuble Lake has reduced phosphorus. Ensure that spring flow from Scheuble Lake has reduced phosphorus. In-Lake Phosphorus must be reduced! In-Lake Phosphorus must be reduced!

12 External Phosphorus Sources The Pollution Stormwater runoff Stormwater runoff Residential Residential Impervious surface Impervious surface Agriculture Agriculture Failing/direct discharge septic systems Failing/direct discharge septic systems Degraded wetlands Degraded wetlands The Solution Buffers, shoreline restoration, infiltration ponds, rain gardens, rock inlets Upgrade you septic system and/or make sure it is compliant Restore and protect wetlands

13 In-lake Phosphorus Sources The Pollution Anoxic sediment Anoxic sediment Seasonal turnover Seasonal turnover Wind and boat propeller mixing Wind and boat propeller mixing Curly leaf pondweed Curly leaf pondweed The Solutions Minimize boat propeller action in shallow areas of lake Aquatic plant management Chemical treatments

14 What Local Government Can Do Help to coordinate local volunteers and efforts Help to coordinate local volunteers and efforts Seek and/or provide funding for projects Seek and/or provide funding for projects Make technical assistance available Make technical assistance available Education Education Provide supplies Provide supplies Offer project ideas Offer project ideas Provide media exposure/promotion Provide media exposure/promotion

15 What you can do Use zero phosphorus fertilizer - it’s the law! Use zero phosphorus fertilizer - it’s the law! Don’t sweep or blow leaves into the street- they will end up in the storm sewer and then the lake. Don’t sweep or blow leaves into the street- they will end up in the storm sewer and then the lake. Install a Rain Garden – they catch runoff from you yard and filter it. Install a Rain Garden – they catch runoff from you yard and filter it. Use a Rain Barrel – they catch runoff from your roof and you can use the water to your garden Use a Rain Barrel – they catch runoff from your roof and you can use the water to your garden Install buffers- they reduce runoff of fertilizer from lawns and ag fields. Install buffers- they reduce runoff of fertilizer from lawns and ag fields. Upgrade failing or direct discharge septic systems Upgrade failing or direct discharge septic systems Educate your neighbors! Educate your neighbors! Restore your shoreline -plant a native vegetation buffer. Restore your shoreline -plant a native vegetation buffer.

16 Next Steps… MPCA approval of TMDL MPCA approval of TMDL EPA approval of TMDL EPA approval of TMDL Design and implementation strategy Design and implementation strategy Seek additional funding$$ Seek additional funding$$ Be proactive! Be proactive! Stay involved! Stay involved!

17 Websites of Interest

18

19 Fish Populations


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