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GATE Exam Questions - Engineering

Q1:

Water table drops by 3 m in an irrigable land of 50 hectare. If porosity and specific retention are 0.30 and 0.10 respectively, the change in storage in hectare-meter is :

A 15

B 30

C 45

D 60

ANS:B - 30

sy+sr = n
sy = 0.30 - 0.10 = 0.20.

sy = volume of water/volume of soil.

Volume of soil = volume of water * volume of soil.
Volume of soil = 50*3*0.2 = 30.