Allied & ICAR Exam Bank • ALLIED_0372 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Open Channel Flow

Subtopic: Open Channel Flow

Question Statement:

A rectangular channel of width $b = 4.0\text{ m}$ carries water at a uniform depth $y = 1.0\text{ m}$. Bed slope $S_0 = 0.0004$ and Manning's $n = 0.02$. The uniform flow velocity in m/s is (rounded off to two decimal places):

Answer Key:

0.76

Step-by-Step Solution & Explanation

$v = \frac{1}{0.02} (0.6667)^{2/3} (0.0004)^{1/2} = 50 \times 0.7631 \times 0.02 = 0.7631\text{ m/s} \approx 0.76\text{ m/s}$.
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