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Missouri Nutrient Criteria Development

Missouri Nutrient Criteria Development. Mark Osborn. Lakes & Reservoirs. Natural Lakes (very few) Sinkhole ponds (in karst areas) Ox-bow lakes, blew holes, wetland lakes 1 tectonic Artificial Lakes and Reservoirs ~2900 > 5 ac in area 22 > 1000 ac in area

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Missouri Nutrient Criteria Development

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  1. Missouri Nutrient Criteria Development Mark Osborn

  2. Lakes & Reservoirs • Natural Lakes (very few) • Sinkhole ponds (in karst areas) • Ox-bow lakes, blew holes, wetland lakes • 1 tectonic • Artificial Lakes and Reservoirs • ~2900 > 5 ac in area • 22 > 1000 ac in area • 456 listed as Waters of the State

  3. History of Reservoir Construction in Missouri (reservoirs > 10 acres in surface area) • Year Completed No. of reservoirs Percentage 1800 – 1920 122 8 1920 – 1940 267 18 1940 – 1960 68 5 1960 – 1980 909 61 1980 – 1995 121 8

  4. Lake Regions in Missouri (12) (53) (82)

  5. Range of Total Phosphorus samples in lake regions

  6. Log distribution of Total Phosphorus in Lake Regions

  7. Log distribution for Total Nitrogen in Lake Regions

  8. Log distribution for chlorophyll-a in lake regions

  9. Log distribution for Secchi depth in lake regions

  10. Median chlorophyll-a response to median total phosphorus

  11. th Chl - a (25 TP Chl - a TP percentile) (median) Plains 8.2 22.5 15.4 43.9 Big Rivers 24.8 70.3 42.7 130.7 Ozarks 2.8 10.9 6.3 19.8 Potential TP criteria based on chlorophyll-a response(ug/L)

  12. Other factors to consider • Designated Uses • Area, Depth, and Volume • Watershed size and characteristics • Residence time

  13. Residence Time outflow 50 inflow 50 Volume 100 RT = 2 years outflow 100 inflow 100 Volume 100 RT = 1 years outflow 200 inflow 200 Volume 100 RT = .5 years

  14. Streams

  15. Rule making procedures

  16. Questions?

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