Missouri Nutrient Criteria Development

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Missouri Nutrient Criteria Development

• Mark Osborn

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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 gt 5 ac in area
• 22 gt 1000 ac in area
• 456 listed as Waters of the State

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History of Reservoir Construction in Missouri
(reservoirs gt 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
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Lake Regions in Missouri
(12) (53) (82)
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Range of Total Phosphorus samples in lake regions
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Log distribution of Total Phosphorus in Lake
Regions
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Log distribution for Total Nitrogen in Lake
Regions
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Log distribution for chlorophyll-a in lake regions
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Log distribution for Secchi depth in lake regions
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Median chlorophyll-a response to median total
phosphorus
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Potential TP criteria based on chlorophyll-a
response(ug/L)
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Other factors to consider

• Designated Uses
• Area, Depth, and Volume
• Watershed size and characteristics
• Residence time

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Residence Time
inflow 50
outflow 50
Volume 100
RT 2 years
outflow 100
inflow 100
Volume 100
RT 1 years
outflow 200
inflow 200
Volume 100
RT .5 years
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Streams
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Rule making procedures
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Questions?