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Consider the following statements in respect of ground water aquifers: 1. Specific storage is specific capacity per unit depth of the aquifer. 2. Specific capacity is storage coefficient per unit aquifer depth. 3. Specific capacity is a constant for a given well. 4. For one-dimensional flow in a confined aquifer between two water bodies, the piezometric head line in the aquifer is a straight line. Which of the above statements are correct?

Consider the following statements in respect of ground water aquifers: 1. Specific storage is specific capacity per unit depth of the aquifer. 2. Specific capacity is storage coefficient per unit aquifer depth. 3. Specific capacity is a constant for a given well. 4. For one-dimensional flow in a confined aquifer between two water bodies, the piezometric head line in the aquifer is a straight line. Which of the above statements are correct? Correct Answer 2 and 4 only

Concept:

Specific yield is the ratio of volume of water in an aquifer that can be extracted by the force of gravity to the total volume of the saturated aquifer.

Specific capacity of a well is its yield per unit drawdown.

Volume of water released per unit area per unit decline or rise of water table is known as Coefficient of storage/Specific storage/Storativity/Storage coefficient.

For an unconfined aquifer storage coefficient is specific yield. So Specific capacity for an unconfined aquifer can be describes as storage coefficient per unit aquifer depth.

So statement 2 is correct and statement 1 is wrong.

Specific capacity is not constant for a given well. But it is a measure of the performance of the well.

For one-dimensional flow in a confined aquifer between two water bodies, the piezometric head line in the aquifer is a straight line.

So statement 2 & 4 are correct here.

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