Question Bank • QB_SUB_IDE_0073 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Wells and Pumps

Subtopic: Types of wells

Question Statement:

In a pumping test on a confined aquifer, Cooper-Jacob semi-logarithmic analysis reveals a drawdown per log cycle of $\Delta s = 1.20\text{ m}$ for a steady discharge $Q = 1800\text{ m}^3\text{/day}$. The aquifer transmissivity $T$ (in $\text{m}^2\text{/day}$, rounded to 1 decimal place) is:

Answer Key:

274.9

Step-by-Step Solution & Explanation

Cooper-Jacob formula: $T = \frac{2.303 Q}{4 \pi \Delta s} = \frac{2.303 \times 1800}{4 \pi \times 1.20} = \frac{4145.4}{15.0796} = 274.9\text{ m}^2\text{/day}$
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