(1) Net evaporation will evaluated using:

(a) Estimation of Evaporation from Shallow Ponds and Impoundments in Montana, Donald E. Potts, Miscellaneous Publication No. 48, Montana Conservation and Experiment Station School of Forestry, University of Montana, Missoula, March 1988;

(b) Evaporation Pond Design for Agricultural Wastewater Disposal, USDA Soil Conservation Service, Montana Technical Note: Environment No. 7, February 1974; or

(c) other department-approved methods. 

(2) If the applicant proposes to deviate from the acceptable standards in (1), the applicant will be required to provide additional information supporting the volume requested for net evaporation.

(3) The department will determine the acceptability of other net evaporation estimates on a case-by-case basis.