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Question
Which of the following statements are correct as regards aquifer characteristics?
1. The storage coefficient is the volume of water released from storage from the entire aquifer due to unit depression of piezometric head.
2. The storage coefficient is the same as the specific yield for water table aquifer.
3. Both the aquifer constants, viz. storage coefficient S and Transmissivity T are dimensionless numbers.
A.
1 only
B.
2 only
C.
3 only
D.
1, 2 and 3
Answer ( Option B)

2 only

Solution

(i) Storage coefficient or storativity is the volume of water released from the storage per unit decline in piezometric head, per unit area of aquifer.
(ii) Water table aquifer ⇒ unconfined aquifer. For unconfined aquifer, storage coefficient is approximately equal to the specific yield.
(iii) Storage coefficient is a dimensionless number Transmissivity = kd
So transmissivity is not a dimensionless number.

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