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