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UPSC Civil Service Exam Questions - Engineering

Q1:

The total observed runoff volume during a 4 hour storm with a uniform intensity of 2.8 cm/hr is 25.2 x 106 m3 from a basin of 280 km2 area. What is the average infiltration rate for the basin ?

A 3.6 mm/hr

B 4.8 mm/hr

C 5.2 mm/hr

D 5.5 mm/hr

ANS:D - 5.5 mm/hr

Precipitation depth , P = Intensity*duration.
= 2.8*4 = 11.2 cm,
= 11 2 mm.

Runoff dept, R, = Runoff volumeArea.
= 25.2*106280*106m,
= 90*10-3 m = 90 mm.

Avg. infiltration rate = 5.5 mm/hr.