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 / year
ii. Life of the reservoir = 50 years
iii. Dead storage = 30
iv. The FSD of the canal at the head = 80 cm
v. The crop water requirement = 250 ha.m
vi. Dependable yield of the catchment = 0.29 m
Calculate 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

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