Allied & ICAR Exam Bank • ALLIED_1225 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Canal Design and Silt Theories

Subtopic: Canal Lining

Question Statement:

Lining an unlined earthen irrigation canal with concrete or geomembrane primarily achieves:

Options:

  • (A) Substantial reduction in seepage losses, increased flow velocity, and prevention of waterlogging in adjacent lands
  • (B) Decreased hydraulic carrying capacity
  • (C) Increased weed growth on canal banks
  • (D) Higher roughness coefficient $n$

Answer Key:

A

Step-by-Step Solution & Explanation

Canal lining reduces Manning's $n$ (from $\approx 0.025$ to $0.014$), boosting carrying capacity while saving up to $30-40\%$ of diverted water otherwise lost to seepage and waterlogging.
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