Data collected specifically to evaluate the increase in the water temperature in a reservoir due to the presence of a monolayer showed an increase in temperature not only at the surface but also at greater depths. This increase in temperature must be accounted for in predicting the reduction in evaporation by monolayers. Use of values for the increase in temperature predicted from the combined energy-budget mass-transfer method indicates a decrease of 8 to 14% in values for evaporation reduction as estimated by the simplified Bureau of Reclamation method, which does not account for the rise in temperature. An approach to predicting the increase in reservoir temperature and the reduction in evaporation as applied to one reservoir gave values for the temperature increase close to those measured.
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