The lowest portion of the capacity-elevation curve of a proposed irrigation reservoir draining 20 km² of catchment is represented by the following data:i. The rate of silting for the catchment = 300 m³ / km² / yearii. Life of the reservoir = 50 yearsiii. Dead storage = 30iv. The FSD of the canal at the head = 80 cmv. The crop water requirement = 250 ha.mvi. Dependable yield of the catchment = 0.29 mCalculate the gross capacity of the reservoir.

The lowest portion of the capacity-elevation curve of a proposed irrig

1.	The lowest portion of the capacity-elevation curve of a proposed irrigation reservoir draining 20 km² of catchment is represented by the following data:i. The rate of silting for the catchment = 300 m³ / km² / yearii. Life of the reservoir = 50 yearsiii. Dead storage = 30iv. The FSD of the canal at the head = 80 cmv. The crop water requirement = 250 ha.mvi. Dependable yield of the catchment = 0.29 mCalculate the gross capacity of the reservoir.
A.	287.5 ha.m
B.	317.5 ha.m
C.	580 ha.m
D.	37.5 ha.m
Answer» C. 580 ha.m