Question Bank • QB_SWCE_ADV_005 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Hydrology

Subtopic: Runoff estimation

Question Statement:

A watershed of area $250\text{ ha}$ has a runoff coefficient $C = 0.4$. During a design storm, the rainfall intensity is $72\text{ mm/h}$ for a duration equal to the time of concentration. Using the Rational formula, the peak runoff discharge is ________ $\text{m}^3/\text{s}$ (answer in integer).

Answer Key:

20

Step-by-Step Solution & Explanation

Using the Rational method formula: $Q = \frac{C \cdot I \cdot A}{360}$ where: - $C = 0.4$ (dimensionless) - $I = 72\text{ mm/h}$ - $A = 250\text{ ha}$ Calculating peak discharge: $Q = \frac{0.4 \times 72 \times 250}{360} = \frac{7200}{360} = 20.0\text{ m}^3/\text{s}$
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