Civil Engineering - GATE Exam Questions - Discussion

40. 

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

Answer: Option B

Explanation:

No answer description available for this question.

Vinod Kumar said: (Jan 20, 2015)  
Can you explain, please?

Jagan said: (Nov 19, 2016)  
Please Explain it.

Sadashiva said: (Jan 14, 2017)  
Porosity = specific yield + specific retention.
0.35 = 0.15 + specific retention.
Specific retention = 0.25.
Change in volume = 0.25 * 200 * 4m.
1.6 * 10^6 m.

Reshma said: (Apr 16, 2018)  
Specific retention is 0.25, is given in question, did you mean specific yield?

Reshma said: (Apr 16, 2018)  
Also .25x200x4 is 200.

How you get 1.6x106? @Sadasiva.

Phani said: (May 7, 2018)  
Here = 0.20 * 4 * 200 * 10^4.
=1.6 x 10^6 m.

Sadashiva said: (Sep 2, 2018)  
Yes, agree @Reshma.

Sadashiva said: (Sep 2, 2018)  
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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