Civil Engineering - GATE Exam Questions - Discussion

Discussion Forum : GATE Exam Questions - Section 7 (Q.No. 10)
10.
A volume of 3.0 x 106 m3 of ground water was pumped out from an unconfined aquifer, uniformly from an area of 5 km2. The pumping lowered the water table from initial level of 102 m to 99 m. The specific yield of the aquifier is
0.20
0.30
0.40
0.50
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
5 comments Page 1 of 1.

Pravin said:   2 years ago
Thank you @Pricilla and @Vishal.

Vishal shah said:   6 years ago
Sp. Yield = ( vol. of ground water) / (Aquifers area x ground water table depletion).

Vol of gr. water = 3 x 10^6 m^3.
Aquifers area = 5 km^2 = 5 x 10^6 m^2.
Ground water table = 102 - 99 = 3 m.

Thus Sp. yield = 0.2.

Abhi said:   6 years ago
Thanks @Pricilla.

Chhaya said:   6 years ago
Thanks @Pricilla.

Pricilla said:   8 years ago
Specific yield = Volume/Area*WT level.

where, WT level = 102-99 = 3 m.

Specific yield = 3*10^6/ (5*10^6*3) = 0.2

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