Question # $4$:

A catchment has four sub$-$areas. The annual precipitation and evaporation from each of the subareas are given below. Assume that there is no change in the ground water storage on an annual basis and calculate for the whole catchment the values of the annual average:

a$-$ Precipitation

b$-$ Evaporation

What is the annual runoff coefficient for the sub$-$areas and for the total catchment as a whole?

$\backslash$table$[[$Sub$-$area,Area $(M{m}^2),$Annual precipitation $(mm),$Annual evaporation $(mm)$