An Engineer in charge of a reservoir has to release water from it for being picked at a distance of 50m km d/s side. The average width of the stream is 40m. The mean daily class A pan evaporation for that season is 0.5 m. estimate the mean daily evaporation loss to be considered by the engineer in releasing water in Ha-m. Take Cp= 0.7.why has the engineer taken note of evaporation and its measurement

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