- (a) The maximum temperature difference on the mixing zone boundary must be computed using the following equation to determine if there is a reasonable potential to exceed 2.8 °C outside the mixing zone: T' = (Tf - Ta) / df. The dilution factor, df, must be that which yields the maximum temperature difference on the mixing zone boundary.
- (b) Substituting for df, the following equations shall be used for discharges to streams:T' = (1.94Q* (Tf - Ta)) / (1 + Q*) when Q* is less than or equal to 0.1823, orT' = (Tf - Ta) / (6.17 - 15.51Q*) when Q* is greater than 0.1823 and less than 0.3333, or T' = Tf - Ta when Q* is greater than or equal to 0.3333. Q* = Qe/Qu (the dilution capacity).
- (c) The following equations shall be used for discharges to lakes: T' = (D(Tf - Ta)) / 20.15 when is greater than or equal to 3 feet. D is pipe diameter, and T' = (W1/2(Tf - Ta)) / 4.2 when W is greater than or equal to 3 feet. W is canal width.
- (d) There is a reasonable potential that the effluent may cause a criterion exceedance at the maximum concentration on the mixing zone boundary if T' > 2.8C.
Added at 40 Ok Reg 329, eff 10-25-22 (emergency)
Added at 40 Ok Reg 2062, eff 9-15-23