Question Bank • QB_IDE_EXP_012 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:

An unlined irrigation canal carries a discharge of $16\text{ m}^3\text{/s}$ in alluvium with Lacey's silt factor $f = 1.0$. According to Lacey's regime theory, the wetted perimeter $P$ in meters is ________ (answer in integer).

Answer Key:

19

Step-by-Step Solution & Explanation

Lacey's regime wetted perimeter formula: $P = 4.75 \sqrt{Q}$ Given $Q = 16\text{ m}^3\text{/s}$: $P = 4.75 \times \sqrt{16} = 4.75 \times 4 = 19.0\text{ m}$
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