Consider that the lake of Problem 1 has a surface area of 1.3 mi2. (a) If the average annual evaporation rate is estimated to be 0.7 of the average daily rate calculated in Problem 1, what volume in million gallons per day (mgd) and cubic meters per day would be lost to evaporation? (b) If the average water use of an urban community is 180 gallons per capita per day (gpcd), how large a community would the daily evaporation rate sustain?
Problem 1
Using the Meyer and Dunne equations, find the daily evaporation rate for a lake given that the mean value for air temperature was 80°F, the mean value for water temperature was 60°F, the average wind speed was 10 mph, and the relative humidity was 25%. Refer to Appendix Table A.2 for vapor pressure values.
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