It depends on the temperature, the wind speed, the sunshine level, the area environment (open space, trees, vehicle movement, day or night).
If you can give me these details.
I can give you an exact answer.
Evaporation Rate E 0 = 700 T m / ( 100 − A ) + 15 ( T − T d ) ( 80 − T ) ( mm day − 1 ) where Tm = T + 0.006h, h is the elevation (metres), T is the mean temperature, A is the latitude (degrees) and Td is the mean dew-point.
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