EffPrec returns the value of effective precipitation.
Usage
EffPrec(P_tot)
Value
The function returns the value of effective monthly precipitation [mm].
Arguments
P_tot
A numeric scalar that denotes the total 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.