Question Bank • QB_SUB_IDE_0041 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Agricultural Drainage

Subtopic: Drainage coefficient

Question Statement:

An agricultural watershed of area $500\text{ ha}$ requires a drainage coefficient of $12\text{ mm/day}$. The required design drainage outlet capacity (in $\text{m}^3\text{/s}$, rounded to 3 decimal places) is:

Answer Key:

0.694

Step-by-Step Solution & Explanation

Drainage discharge: $Q = \frac{A \times D.C.}{86400} = \frac{(500.0 \times 10^4) \times (12.0 \times 10^{-3})}{86400} = \frac{60000.0}{86400} = 0.694\text{ m}^3\text{/s}$
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