=+13-5. Estimate the rate at which water is evaporated from a 1000 acre lake on an August day when the dry bulb and wet bulb temperatures are 100 and 75 F. respectively (43,560 ft2 = I acres Assume a heat-transfer coefficient / of 5 Btu/(hr-ft2-F) between the moist air and the lake sur face and a water surface temperature of 80 F.