A catchment has four subareas. The annual precipitation and evaporation from each of the subareas are given in Table 1. 4. Assume that there is no change in groundwater storage on an annual basis and calculate for the whole catchment the values of annual average

(a) precipitation and

(b) evaporation.

Table  1. 4

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TABLE 1.4 Annual Precipitation and Evaporation of Catchment in Problem 21 Subarea Area (m) ABCD Annual Precipitation (mm) 10.7 1,030 3.0 830 8.3 900 17.9 1,300 Annual Evaporation (mm) 535 458 469 610