Oklahoma Administrative Code
Title 252 - Department of Environmental Quality
Chapter 690 - Water Quality Standards Implementation
Subchapter 3 - Point Source Discharges
Section 252:690-3-59 - Effluent characterization for the implementation of dissolved oxygen criteria to protect the Fish and Wildlife Propagation beneficial use

(a) Flow. For industrial facilities, Qe(30) is used as the regulatory effluent flow. For municipal facilities, the design flow Qe(D) is used as the regulatory effluent flow. The regulatory effluent flow used for permitting purposes will not exceed the approved design flow in the WQMP for municipal facilities or the approved critical effluent flow in the WQMP for industrial facilities. For modeling purposes, a projected effluent flow justified by engineering calculations may be utilized.

(b) Temperature. The seasonal temperatures specified in the OWQS will be used to model point source effluent temperature unless discharge-specific data is available. If at least one year of average daily effluent temperature values is available, the upper 90th percentile value calculated from the dataset for the season will be used.

(c) Water quality constituents. For steady-state models, water quality constituents will be modeled at average values. For dynamic models, values will be established on a case by case basis.