Studies of evaporation made in recent years nave provided values of the mass-transfer coefficient, N, in the equation E=Nut(e0-ea) for reservoirs having surface areas ranging from 1 to nearly 30,000 acres. The apparent correlation of N with reservoir surface area may in large part be associated with variations in the shape of the wind profile near the surface resulting from differences in surface roughness. It appears that evaporation from many reservoirs can be determined with acceptable accuracy with a fairly simple system of instrumentation, data processing, and analysis. ' C7
This report is the third and final one of the series on water-loss investigations conducted jointly by several Federal agencies during the years 1950-53. Previous reports are water-loss investigations: Lake Hefner studies, technical report (Geological Survey Professional Paper 269 and also Navy Electronics Laboratory Report 327, San Diego 52, Calif.) and water-loss investigations: Lake Hefner studies, base data report
Technical Coordination Branch, and under the technical direction of W. B. Langbein, Hydraulic Engineer. The study was originally suggested by J. D. Doherty, Synthetic Liquid Fuels Branch, u. s. Bureau .of Mines, II who also furnished useful information concerning appro:,cimate quantities of heat to be disposed of as a result of. certain industrial processes.
Evaporation from a water surface may be reduced by the application of a monomolecular film. Because of possible seasonal variations in evaporation‐pan coefficients, computed savings in evaporation may be unreliable if based upon evaporation‐pan records. A more reliable measure of the evaporation reduction is obtained by the solution of equations based upon energy budget and heat and mass transfer theory. The rise in water‐surface temperature caused by application of the film can be computed.
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