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UPSC Civil Service Exam Questions - Engineering

Q1:

A catchment has an area of 150 hectares and a run-off/rainfall ratio of 0.40. If due to 10 cm rainfall over the catchment, a stream flow at the catchment outlet lasts for 10 hours, what is the average stream flow in the period ?

A 60, 000 m3/hour

B 100 m3/minute

C 3.5 m3/s

D 1.33 m3/s

ANS:B - 100 m3/minute

Runoff = 150 × 10^4 × 0.4 × 0.1 = 60,000.
Average stream flow = 60,000/10 × 60 = 100.