Subtopic: Planning, design and layout of surface and sub-surface drainage systems
Question Statement:
If the drainable porosity of a command area is 5% and the design rate of drop of the water table is 0.25 m day⁻¹, the drainage coefficient of the command area in mm day⁻¹ will be
Options:
(A) 250
(B) 12.5
(C) 1.25
(D) 0.0125
Official Answer Key:
B
Step-by-Step Solution & Explanation
Drainage coefficient, DC = drainable porosity × rate of water-table drop = 0.05 × 0.25 m/day = 0.0125 m/day = 12.5 mm/day. Answer: (B).
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