Question Bank • QB_IDE_CONV_001 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 $P$ for a design canal discharge $Q = 16.0\text{ m}^3\text{/s}$ ($P = 4.75 \sqrt{Q}$) in metres is ________ (answer in integer).

Answer Key:

19

Step-by-Step Solution & Explanation

Lacey's regime wetted perimeter equation: $P = 4.75 \sqrt{Q}$ Given $Q = 16.0\text{ m}^3\text{/s}$: $P = 4.75 \times \sqrt{16.0} = 4.75 \times 4.0 = 19.0\text{ m}$
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