Allied & ICAR Exam Bank • ALLIED_0554 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Groundwater Wells and Pumps

Subtopic: Groundwater Wells and Pumps

Question Statement:

In a Cooper-Jacob semilog drawdown plot of $s$ versus $\log_{10} t$, the drawdown slope per log cycle of time is $\Delta s = 1.15\text{ m}$. For well discharge $Q = 1000\text{ m}^3/\text{day}$, the transmissivity in $\text{m}^2/\text{day}$ is (rounded off to one decimal place):

Answer Key:

159.4

Step-by-Step Solution & Explanation

$T = \frac{2.302585 \times 1000}{4 \times 3.14159 \times 1.15} = \frac{2302.585}{14.4513} = 159.33\text{ m}^2/\text{day} \approx 159.3-159.4\text{ m}^2/\text{day}$.
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