Allied & ICAR Exam Bank • ALLIED_0429 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Hydrology and Runoff

Subtopic: Hydrograph Analysis and Watershed Routing

Question Statement:

A catchment of area $A = 180\text{ km}^2$ has a $1\text{ cm}$ unit hydrograph. If this volume is represented by a triangular unit hydrograph of base time $T_b = 20\text{ hours}$ ($72,000\text{ s}$), the peak discharge in $\text{m}^3/\text{s}$ is:

Answer Key:

50

Step-by-Step Solution & Explanation

$Q_p = \frac{2 \times 1,800,000}{72,000} = \frac{3,600,000}{72,000} = 50.0\text{ m}^3/\text{s}$.
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