Question Bank • QB_SUB_IDE_0194 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Canal Design: Lacey, Kennedy & Tractive Force

Subtopic: Lacey regime wetted perimeter

Question Statement:

A regime irrigation canal carries a design discharge $Q = 25.0\text{ m}^3\text{/s}$. According to Lacey's regime theory, the wetted perimeter $P$ of the canal (in meters) is:

Answer Key:

23.75

Step-by-Step Solution & Explanation

Lacey's regime wetted perimeter formula: $P = 4.75 \sqrt{Q} = 4.75 \sqrt{25.0} = 4.75 \times 5.0 = 23.75\text{ m}$
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