Okla. Admin. Code § 252:740-5-2

Current through Vol. 41, No. 19, June 17, 2024

Section 252:740-5-2 - Regulatory flow determination

(a)Regulatory receiving stream flow. Section 252:730-5-12(f)(6)(G) of the OAC defines the regulatory receiving stream flow upstream of the discharge, Q_u, to be used in implementing fish and wildlife propagation criteria. The Q_u is the greater of the 7Q2 or 1 cfs. 7Q2 shall be determined according to OAC 252:740-1-6. Q _u is assumed to be 1 cfs if the 7Q2 is unknown or the permittee chooses not to develop an actual 7Q2.

(b)Regulatory flow for lakes. No regulatory flow determination is required for lakes.

(c)Regulatory effluent flows. The regulatory effluent flow, Q_e, is the highest monthly averaged flow over the previous two years for industrial discharges if the permitting authority determines that sufficient data are available. For other dischargers (e.g. municipalities), Q e is the design flow. If a significant daily or seasonal variability in effluent flow is present, a regulatory effluent flow should take this variability into account.

Okla. Admin. Code § 252:740-5-2

Adopted by Oklahoma Register, Volume 40, Issue 6, December 1, 2022, eff. 10/25/2022

Adopted by Oklahoma Register, Volume 40, Issue 24, September 1, 2023, eff. 9/15/2023