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Impaired Waters

Impaired Waters. Waters are classified as impaired when they fail to meet state water quality standards and have been placed on the federal impaired waters list 303(d). Lake Studies. Total Maximum Daily Load (TMDL).

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Impaired Waters

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  1. Impaired Waters Waters are classified as impaired when they fail to meet state water quality standards and have been placed on the federal impaired waters list 303(d)

  2. Lake Studies

  3. Total Maximum Daily Load(TMDL) • A Total Maximum Daily Load study must be conducted for lakes, streams and rivers that have been listed as impaired. • Total Maximum Daily Load is the extent to which a body of water is able to assimilate or tolerate a pollutant and still maintain its water quality standards. Lake Studies

  4. TMDL Analysis • A TMDL is the sum of the individual waste loads from point sources, nonpoint sources and natural background, with an additional loading allowance for a margin of safety. This is generally described by the following equation… Lake Studies

  5. TMDL (AC) = WLA+LA+MOS Where: • AC = Assimilative Capacity of the water body to achieve/maintain standards • WLA = Waste Load Allocation, quantification of pollutant loads from point sources discharging to the water body • LA= Load Allocation, quantification of pollutant loads from nonpoint sources • MOS = Margin of Safety, reflects uncertainty in the analysis, a desire to provide an extra margin of protection for beneficial uses, or an allowance for future growth Lake Studies

  6. Impairments for Excess Nutrients • Data must show exceedances of two of the following three standards 1. Total Phosphorus (causal factor) 2. Chlorophyll- a (response variable) 3. Secchi disk (response variable) Lake Studies

  7. WQ Standards (Northern Glaciated Plains)

  8. WQ Standards (North Central Hardwood Forest)

  9. Lake Water Quality Lake Studies

  10. Why require phosphorus control? • Phosphorus is the limiting nutrient for algal growth in most Minnesota lakes and streams • Other limiting factors such as sunlight and temperature cannot be controlled in a lake or stream Lake Studies

  11. Phosphorus = Algae Lake Studies

  12. Sources of phosphorous P P P P P P Lake Studies

  13. Phosphorus Cycle Lake Studies

  14. Phosphorus reductions needed to meet WQ standard Lake Studies

  15. Lake Leven P Inventory Lake Studies

  16. Gilchrist Lake P Inventory Lake Studies

  17. Anne Lake External P Inventory Lake Studies

  18. Reno P Inventory Lake Studies

  19. Malmedal P Inventory Lake Studies

  20. Strandness P Inventory Lake Studies

  21. Pelican Lake P Inventory Lake Studies

  22. Lake Emily External P Inventory Lake Studies

  23. Impaired Waters Tim JamesMinnesota Pollution Controltim.james@state.mn.us 218-846-8103 Lake Studies

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