Allied & ICAR Exam Bank • ALLIED_1151 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Hydrology and Runoff

Subtopic: Rational Formula

Question Statement:

A small agricultural watershed of area 60 hectares has a runoff coefficient $C = 0.35$. The critical storm rainfall intensity for the design return period is $50\text{ mm/h}$. Using the Rational formula ($Q = \frac{C I A}{360}$), the peak runoff rate (in m$^3$/s) is:

Answer Key:

2.92

Step-by-Step Solution & Explanation

$Q = \frac{C \times I \times A}{360} = \frac{0.35 \times 50 \times 60}{360} = \frac{1050}{360} \approx 2.917\text{ m}^3/\text{s}$.
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