Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 375 - COMBINED SEWER OVERFLOW EXCEPTION CRITERIA AND FIRST FLUSH DETERMINATION
Subpart D - FIRST FLUSH DETERMINATION
Section 375.401 - Variables in First Flush Determination
Universal Citation: 35 IL Admin Code ยง 375.401
Current through Register Vol. 48, No. 38, September 20, 2024
The intensity and duration of first flush are a function of certain variables including:
a) Physical and hydraulic features of the sewer system and tributary watershed.
b) Amount of sediment accumulated in the sewer system and on impervious surfaces of the watershed.
c) Intensity and duration of the storm event causing the flushing.
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