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<br />""j~(lno <br />.... ~v.... <br /> <br />ABSTRACT <br /> <br />A model is developed for predicting evaporation suppression due to the surface <br />cooling effect of reservoir destratification. The model is based upon measured <br />temperature profiles at a sample of ten Utah reservoirs. Regression analysis is then <br />used to exlend the results to all other deep reservoirs in Utah. Both suppression <br />amounts and costs are estimated for each reservoir. <br /> <br />The use of thermal mixing by either mechanical pumping or compressed air <br />appears to have important potential for evaporation suppression on deep reservoirs. <br />This concept does not involve many of the problems associated with monolayer <br />suppression. It is independent of wind; it does not produce a concentration of excess <br />heat near the surface; it provides a mechanism for net suppression on an annual <br />rather than only a seasonal basis (warmed outflow); and it does not involve <br />environmental problems associated with adding chemicals to the reservoir surface. <br />There are. in fact. several environmental benefits claimed for the destratification <br />procedure. Significant improvement in dissolved oxygen, taste and odor, algae <br />production. and many other quality parameters occur in the hypolimnion water. In <br />addition to these human related benefits. fish habitat may be improved both in the <br />reservoir (because of increased D.O.) and downstream from it. <br /> <br />A major potential for water conservation in general and water energy production <br />and salinity control in particular exists at Lake Powell. <br /> <br />Hi <br />