Abstract This project tested the applicability of the MAIN II (Municipal and Industrial Needs) Water Forecasting System to five Wyoming communities: Cheyenne, Casper, Glenrock, Rock Springs and Green River which are fairly representative of western communities. Errors found in the MAIN II program were corrected, and the program was modified. Certain kinds of data were difficult to obtain for the five communities. Using a base year, forecasts were made and compared with actual water demands. Three optional MAIN II projection methods (internal growth model, historical extrapolation of data and external projection) were tested. The results showed the latter two methods to be fairly reliable The internal growth models were not representative of Wyoming cities due to the atypical growth patterns of Wyoming communities.
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