Ill. Admin. Code tit. 35 § 302.658

Current through Register Vol. 48, No. 45, November 8, 2024
Section 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.

Ill. Admin. Code tit. 35, § 302.658

Added at 14 Ill. Reg. 2899, effective February 13, 1990

Amended at 47 Ill. Reg. 4437, effective 3/23/2023