Ill. Admin. Code tit. 35, § 302.658 - Stream Flow for Application of Human Nonthreshold Criterion
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. |
Notes
Added at 14 Ill. Reg. 2899, effective February 13, 1990
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