Question Bank • QB_SWCE_EXP_061 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Hydrology

Subtopic: Hydrological cycle and measurement of its components

Question Statement:

Using the Rational method $Q = \frac{C I A}{360}$, calculate the peak runoff rate in $\text{m}^3/\text{s}$ from an agricultural watershed of area $A = 120\text{ ha}$, with a runoff coefficient $C = 0.45$ and a rainfall intensity $I = 60\text{ mm/h}$.

Answer Key:

9

Step-by-Step Solution & Explanation

$Q = \frac{C \times I \times A}{360} = \frac{0.45 \times 60 \times 120}{360} = \frac{3240}{360} = 9.0\text{ m}^3/\text{s}$
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