Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 302 - WATER QUALITY STANDARDS
Subpart F - PROCEDURES FOR DETERMINING WATER QUALITY CRITERIA
Section 302.658 - Stream Flow for Application of Human Nonthreshold Criterion
Universal Citation: 35 IL Admin Code ยง 302.658
Current through Register Vol. 48, No. 38, September 20, 2024
The HNC applies at all times except during periods when flows are less than the harmonic mean flow (Qhm), as determined by:
Qhm = N / SUM(1/Qi)
Where:
|
Qhm |
= |
harmonic mean flow, |
|
N |
= |
number of daily values for streamflows, and |
|
Qi |
= |
daily streamflow value on day i. |
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