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The model recommended by ASHRAE (the American Society of Heating, Refrigeration and Air-conditioning Engineers): W = [A + (B)(V)](Pw - Pa)/Hv ..............................(1)
where: W = water evaporation rate, (lb/hr) per sq.ft. of pond surface area
A = a constant = 95 (**see note below)
B = a constant = 37.4 (**see note below)
V = air velocity over the pond surface, miles/hr
Pw = vapor pressure of water at the pond water temperature, inches of Hg
Pa = vapor pressure of water at the air dewpoint temperature, inches of Hg
Hv = heat of vaporization of water at the pond water temperature, Btu/lb