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GATE Exam Questions - Engineering

Q1:

An outlet irrigates an area of 20 ha. The discharge (l/s) required at this outlet to meet the evapotranspiration requirement of 20 mm occurring uniformly in 20 days neglecting other field losses is

A 2.52

B 2.31

C 2.01

D 1.52

ANS:B - 2.31

Q=V/t =A*D/t.
Q=20*10^4X0.02/20
Q=200m^3/day.

But the question asked is discharge (L/s) so we should convert to L/s from m^3/day..
Q=200*1000/86400,
Q=2.31
Q=20*10^4*10^3*0.02/20*86400.
Q=2.31L/s.

Where,
Q-discharge.
V-volume.