Question Bank • QB_IDE_DRN_001 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Agricultural Drainage

Subtopic: Drainage coefficient

Question Statement:

An agricultural watershed of area $250\text{ ha}$ has a design drainage coefficient of $15\text{ mm/day}$. The continuous design drainage outflow rate required to remove this excess water in $\text{m}^3\text{/s}$ is ________ (round off to 3 decimal places).

Answer Key:

0.434

Step-by-Step Solution & Explanation

1. Daily volume of excess water: $V = A \times D_c = (250 \times 10^4\text{ m}^2) \times 0.015\text{ m} = 37,500\text{ m}^3\text{/day}$ 2. Discharge in $\text{m}^3\text{/s}$: $Q = \frac{37,500\text{ m}^3}{86,400\text{ s}} \approx 0.43403\text{ m}^3\text{/s} \approx 0.434\text{ m}^3\text{/s}$
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