Question Bank • QB_IDE_ADV_114 NAT • 1 Mark

Section 5: Irrigation and Drainage Engineering

Wells and Pumps

Subtopic: Steady flow through wells

Question Statement:

An irrigation tubewell discharges at a steady pumping rate of $Q = 1500.0\text{ L/min}$ ($90.0\text{ m}^3/\text{h}$) and records a stabilized drawdown of $s_w = 4.50\text{ m}$ at the well face. The specific capacity ($Q / s_w$) of the tubewell in cubic meters per hour per meter of drawdown ($\text{m}^3/(\text{h}\cdot\text{m})$) is ________ (round off to one decimal place).

Answer Key:

20.0

Step-by-Step Solution & Explanation

1. Specific capacity definition: $\text{Specific Capacity} = \frac{Q}{s_w}$ Where: - $Q = 90.0\text{ m}^3/\text{h}$ - $s_w = 4.50\text{ m}$ $\text{Specific Capacity} = \frac{90.0\text{ m}^3/\text{h}}{4.50\text{ m}} = 20.0\text{ m}^3/(\text{h}\cdot\text{m})$
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