3. Potential evaporation is defined as the amount of water that could be evapora

Question

3. Potential evaporation is defined as the amount of water that could be evaporated were it available. It is a function of surface and air temperatures, insolation, and wind, all of which affect water- vapor concentrations immediately above the evaporating surface. But the empirical equation 2B4.2 (related to the Blaney-Criddle equation) uses temperature in Kelvin: PET (in mm/yr) = 1.2 x 1010 * exp(-4620rT); note that exp in the equations in the textbook refer to exp(x) or e Calculate PET for The City of Hilo (194220"N 155°59"W), on the Eastern side of the island of Hawaii has average air temperature of 73.85°F (during the day). Calculate the PET for the city of Hilo using the equation cited Calculate PET for The City Portland, Oregon has average maximum air temperature of 63.1°F. Calculate the PET for Portland. a. b.

Explanation / Answer

a) 73.85 F = 296.4 K

PET = 1.2x1010 x e(-4620/296.4) = 2040.862 mm/yr

b) 63.1 F = 290.4278 K

PET = 1.2x1010 x e(-4620/290.4278) = 1481.194 mm/yr

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