oxygen sage curve

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Last updated 2:55 PM on 4/22/26
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5 Terms

1
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clean zone (-20-0)

upstream to pollution, water clean and healthy, high DO, low BOD, trout/perch/bass/mayfly/stonefly

2
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decomposition zone (0-20)

immediately after point source contamination, decomposition begins (requires oxygen), high BOD, low DO, trashy fish (carpet, gar, leech)

3
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septic zone (20-40)

massive decomposition, DO Lowest, as decomp slows, BOD creases, only decomposers (slow)

4
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recovery zone (40-60)

decomp stops, DO begins to rise, BOD cont decrease, trashy fish can survive

5
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clean zone

water clear and healthy, normal clean H2O organisms, DO increase, BOD decrease