EffPrec returns the value of effective precipitation.
EffPrec(P_tot)
Arguments
P_tot: A numeric scalar that denotes the total monthly precipitation [mm].
Returns
The function returns the value of effective monthly precipitation [mm].
Details
This is a function to calculate the effective precipitation [mm]. The function formula has been developed for Iran where the mean annual precipitation is about 250 mm. It may be used for similar semi-arid areas, but it is not recommended for the areas with different climate.