Question Bank • QB_SUB_IDE_0009 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Groundwater Hydrology

Subtopic: Groundwater occurrence

Question Statement:

An unconfined aquifer has an aerial extent of $5.0\text{ km}^2$. The specific yield of the aquifer is $S_y = 0.16$. If the water table drops by an average depth of $2.0\text{ m}$, the total volume of groundwater released from storage (in million cubic meters, $10^6\text{ m}^3$) is:

Answer Key:

1.6

Step-by-Step Solution & Explanation

Volume released: $V = A \times \Delta h \times S_y = (5.0 \times 10^6\text{ m}^2) \times 2.0\text{ m} \times 0.16 = 1.60 \times 10^6\text{ m}^3$
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