Question Bank • QB_IDE_ADV_063 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 main irrigation canal in an alluvial tract carries a design discharge of $Q = 36.0\text{ m}^3/\text{s}$. According to Lacey's regime theory, the required wetted perimeter ($P$) of the stable regime channel in meters is ________ (round off to two decimal places).

Answer Key:

28.50

Step-by-Step Solution & Explanation

1. Lacey's regime wetted perimeter equation: $P = 4.75 \sqrt{Q}$ Where: - $Q = 36.0\text{ m}^3/\text{s}$ $\sqrt{Q} = \sqrt{36.0} = 6.0$ 2. Evaluating $P$: $P = 4.75 \times 6.0 = 28.50\text{ m}$
← Previous (QB_IDE_EXP_080) Next (QB_IDE_ADV_070) →

Practice In Authentic CBT Exam Interface

Test your skills under authentic timed conditions with live scoring and AIR percentile ranking.

Launch CBT Mock Test