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The Dane County Regional Hydrologic Study. Conceptualized groundwater flow system for Dane County Source: Bradbury and others, 1999.

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Presentation on theme: "The Dane County Regional Hydrologic Study. Conceptualized groundwater flow system for Dane County Source: Bradbury and others, 1999."— Presentation transcript:

1 The Dane County Regional Hydrologic Study

2 Conceptualized groundwater flow system for Dane County Source: Bradbury and others, 1999.

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5 Recommendations : Alternative pumping strategies Maximizing infiltration Water conservation Analyzing impacts of proposed wells on sensitive resource areas Innovative measures (e.g., treating wastewater as a resource)

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7 Primary Groundwater Quality Problems in Dane County Nitrates and Bacteria Pesticides Volatile Organic Compounds (VOCs)

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10 Zones of Contribution Dane County Proposed 2020 Pumping Rates

11 Naturally Vulnerable Areas  Locate pollution sources outside these areas  Require special conditions or controls Potential Problem Areas  Existing pollution source areas which threaten drinking water supplies

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13 Elevated Nitrate Levels: Over-fertilization (in excess of crop uptake) Manure Storage Failing Septic Systems Clusters of On-Site Systems (rural subdivisions)

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15 Agriculture: Improved design/construction of manure storage facilities Proper abandonment of manure storage pits Nutrient management planning (to reduce over-fertilization)

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17 Residential On-Site Systems: Triennial inspection and maintenance Evaluate the impact of clusters of on-site systems (rural subdivisions) Replace failing systems Information and Education

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20 Pesticides: Increased monitoring - especially extreme risk areas Promote alternatives to pesticides - such as Integrated Pest Management

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22 Landfills: More monitoring of closed landfills (esp. extreme risk areas and well protection zones) Locate future sites outside these areas Continued support of recycling, waste- reduction and hazardous waste programs

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24 Above Ground Storage Tanks Less of a problem However, information gaps for fuel/chemical tanks (<1,000 gals.) Greater emphasis on proper storage of fuel, pesticides and fertilizers is needed

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26 Land Application of Septage: County oversight/responsibility for approval of land spreading sites Sites should be carefully designed and located outside extreme risk areas and well protection zones More authorized discharge points at municipal treatment plants

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28 Summary: All Significant Land Use and Siting Decisions Should Include an Evaluation of the Potential Groundwater and Hydrologic Impacts:  Locate pollution sources away from high/extreme risk areas  Locate wells where they will be adequately protected  Pursue various management programs to reduce the risk of contaminating drinking water supplies

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