Classified Streams Anti-degradation Must support aquatic life Meet - - PDF document

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10/15/2012 Possible Procedure to set DO Criteria for Newly Classified Streams Matt Combes Streams Community Ecologist Missouri Department of Conservation Classified Streams Anti-degradation Must support aquatic life Meet water

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Possible Procedure to set DO Criteria for Newly Classified Streams

Matt Combes Streams Community Ecologist Missouri Department of Conservation

Classified Streams

Anti-degradation Must support aquatic life Meet water quality criteria:

Current standards (5.0 mg/L DO) OR develop appropriate standards

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“Do they even have any life in them to protect?”

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Characteristics of Unclassified Sites (Watershed)

Mean watershed area (km2)

C = 196 (0.73 - 2382) U = 23 (0.44 - 578) X = 0.62 (0.03 - 1.5)

Fish

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Isn’t DO naturally lower in these small headwater streams? OK, so they have fishes. But do those fishes need 5 mg/L O2 to thrive?

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Joined Chronic DO value to predicted species list for all segments on the MORAP 1:100,00 VST. Selected most sensitive species value as criteria for the segment. Thus each segments DO criteria is the most sensitive community members’ critical minimum dissolved

xygen concentration times 2 plus 20%.