WLAT

If reasonable potential is demonstrated, WLAT is required. (1) Streams. Except for streams designated as trout fisheries, Equation K-1, K-2, or K-3 is used to determine WLAT, depending on the value of Q*. WLAT for trout fisheries is 20̊C. (2) Lakes. Depending on whether the discharge conveyance is a pipe or canal, Equation K-4 or K-5 is used to determine WLAT. 252-606-6-49. LTAT LTAT is calculated using a 50% probability basis according to Equation K-6. A CV value of 0.6 is assumed unless a CV was determined from effluent data in accordance with OAC 252:606- 6-9(b).