Question Bank • QB_SUB_IDE_0042 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Agricultural Drainage

Subtopic: Drainage coefficient

Question Statement:

The 'Drainage Coefficient' (D.C.) in agricultural land drainage is defined as:

Options:

  • (A) The depth of excess water in mm removed from the drainage area in a 24-hour period
  • (B) The ratio of drain spacing to drain depth
  • (C) The Manning roughness of the drainage ditch
  • (D) The percentage of rainfall lost to evaporation

Answer Key:

A

Step-by-Step Solution & Explanation

Drainage coefficient is universally defined as the design depth of excess water (typically 10–25 mm) to be drained from a given land area within 24 hours.
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