Ill. Admin. Code tit. 35 § 302.658
Current through Register Vol. 48, No. 40, October 4, 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. |
Ill. Admin. Code tit. 35, § 302.658
Added at 14 Ill. Reg. 2899, effective February 13, 1990