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Specific capacity of a well
1. Decreases with the diameter
2. Increases with the discharge rate
3. Varies linearly with the drawdown
4. Decreases with time from the start of pumping
5. the same for all wells irrespective of their design

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Correct Answer - Option 5 : the same for all wells irrespective of their design

Concept:

The specific capacity of a well is the discharge per unit drawdown in the well. It measures the effectiveness or efficiency of a well.

Factors affecting the specific capacity of well are:

a) Diameter of well: On increasing the diameter of well, its specific capacity increases as yield of well increases.

b) Aquifer thickness: Higher thickness of aquifer, higher will be the specific capacity.

c) Duration of pumping and pumping rate: It decreases with the increase in pumping rate and its duration.

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