1.

The isohyets for annual rainfall over a catchment basin indicate the following. (isohyet, area): (45-55 cm, 500 km2); (55-65, 1000 km2) and (65-75, 2000 km2). The approximate average annual precipitation depth (in cm) over the basin is

A. 52.25
B. 65.25
C. 69.29
D. 59.29
E. 64.28
Answer» F.


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