Question Bank • QB_IDE_EXP_080 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Irrigation Water Conveyance and Application Methods

Subtopic: Design of irrigation channels and underground pipelines

Question Statement:

In Lacey's regime theory, the silt factor is $f = 1.0$. For a canal carrying discharge $Q = 64\text{ m}^3/\text{s}$, calculate the regime flow velocity $V = \left(\frac{Q f^2}{140}\right)^{1/6}$ in $\text{m/s}$.

Answer Key:

0.88

Step-by-Step Solution & Explanation

$\frac{Q f^2}{140} = \frac{64 \times 1^2}{140} = \frac{64}{140} = 0.45714$ $V = (0.45714)^{1/6} \approx 0.8778\text{ m/s}$
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