Oklahoma Administrative Code
Title 252 - Department of Environmental Quality
Chapter 656 - Water Pollution Control Facility Construction Standards
Subchapter 13 - Preliminary Treatment Standards
Section 252:656-13-3 - Diurnal flow equalization
Current through Vol. 41, No. 13, March 15, 2024
(a) General. Provide flow equalization basins to equalize variations in organic and hydraulic loadings where large diurnal organic or hydraulic variations of organic or hydraulic loading are expected, where peak to average is greater than 2:1. Wet weather (excess flow) basins are covered in 252:656-13-4.
(b) Location. Locate basins downstream of pretreatment facilities such as bar screens and grit chambers.
(c) Size. Capacity must be sufficient to reduce expected flow and load variations to less than or equal to 2:1. The volume required to achieve the desired degree of equalization can be determined from a cumulative flow plot over a representative 24-hour period.
(d) Operation.
Added at 17 Ok Reg 1140, eff 6-1-00; Amended at 23 Ok Reg 937, eff 6-15-06; Added at 28 Ok Reg 1282, eff 7-1-11