Allied & ICAR Exam Bank • ALLIED_1187 NAT • 1 Mark

Section 4: Soil and Water Conservation Engineering

Open Channel Flow

Subtopic: Froude Number

Question Statement:

In a rectangular open channel, flow velocity is $V = 4.43\text{ m/s}$ and water depth is $y = 0.5\text{ m}$. Taking $g = 9.81\text{ m/s}^2$ (so $\sqrt{gy} = \sqrt{4.905} \approx 2.215\text{ m/s}$), the Froude number $Fr$ is:

Answer Key:

2.0

Step-by-Step Solution & Explanation

$Fr = \frac{4.43}{2.215} = 2.0$. Since $Fr > 1$, the flow regime is supercritical.
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