Question Bank • QB_IDE_EXP_061 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Agricultural Drainage

Subtopic: Drainage coefficient

Question Statement:

An agricultural drainage system has a design drainage coefficient of $DC = 12\text{ mm/day}$ ($0.012\text{ m/day}$). If the catchment area drained is $50\text{ ha}$ ($500,000\text{ m}^2$), calculate the design peak drainage discharge in $\text{L/s}$.

Answer Key:

69.44

Step-by-Step Solution & Explanation

Volume per day: $V = 500000\text{ m}^2 \times 0.012\text{ m} = 6000\text{ m}^3/\text{day}$ Discharge in $\text{m}^3/\text{s}$: $Q = \frac{6000}{86400\text{ s}} = 0.06944\text{ m}^3/\text{s} = 69.44\text{ L/s}$
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