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Question

An unconfined aquifer of porosity 35%, permeability 40 m/day and specific yield of 0.15 has an area of 100 km2. If the water table falls uniformly throughout the aquifer area by 0.2 m during a drought, the volume of water lost from storage is ________.

A
1.5 Mm3
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B
3.0 Mm3
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C
7.0 Mm3
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D
8.0 Mm3
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Solution

The correct option is B 3.0 Mm3
Volume lost=Sy×Drawdown×Area
=0.15×0.2×100×106 m3
=3×106 m3=3 Mm3

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