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GATE Exam Questions

Q1: In an area of 200 hectare, water table drops by 4 m. If the porosity is 0.35 and the specific retention is 0.15, change in volume of storage in the aquifer is

A 160 m3

B 1.6 x 106 m

C 8 x 106 m3

D 1.6 x 103 m3

ANS:B - 1.6 x 106 m

Porosity = specific yield + specific retention.
0.35 = specific yield + 0.15,
Specific yield = 0.20,

Change in volume = 0.2 * 200hectare * 4m*10000 (1 Hectare=10000sq.mt) S.
1.6 * 10^6 m.



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