Question Bank • QB_IDE_EXP_079 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:

According to Lacey's regime theory for alluvial channels, the wetted perimeter is given by $P = 4.75 \sqrt{Q}$. For a regime canal carrying a design discharge of $Q = 16\text{ m}^3/\text{s}$, calculate the wetted perimeter $P$ in $\text{meters}$.

Answer Key:

19

Step-by-Step Solution & Explanation

$P = 4.75 \times \sqrt{16} = 4.75 \times 4 = 19.0\text{ m}$
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