Question Bank • QB_IDE_GWH_001 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Groundwater Hydrology

Subtopic: Groundwater occurrence

Question Statement:

An unconfined regional aquifer has a total geometric volume of $5.0 \times 10^6\text{ m}^3$. The specific yield of the aquifer formation is $S_y = 0.22$ and its specific retention is $S_r = 0.08$. The total volume of gravity drainable water released from storage when the water table falls across this entire volume in thousands of cubic metres ($V / 1000\text{ m}^3$) is ________ (answer in integer).

Answer Key:

1100

Step-by-Step Solution & Explanation

1. Volume of gravity-drainable water: $V_w = S_y \times V_{aquifer}$ Given: • $S_y = 0.22$ • $V_{aquifer} = 5.0 \times 10^6\text{ m}^3$ $V_w = 0.22 \times (5.0 \times 10^6) = 1.10 \times 10^6\text{ m}^3$ 2. In thousands of $\text{m}^3$: $\frac{1.10 \times 10^6}{1000} = 1100$
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