Allied & ICAR Exam Bank • ALLIED_1175 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Hydrology and Runoff

Subtopic: S-Curve Hydrograph

Question Statement:

A catchment has an area of 72 km$^2$. For an equilibrium S-curve hydrograph generated from continuous rainfall excess at rate $1.0\text{ cm/h}$, the equilibrium discharge $Q_e$ (in m$^3$/s) is: (using $Q_e = \frac{2.778 A}{D}$ where $A$ in km$^2$ and $D=1\text{ h}$)

Answer Key:

200

Step-by-Step Solution & Explanation

$Q_e = \frac{A \times 10^6\text{ m}^2 \times 0.01\text{ m}}{3600\text{ s}} = \frac{72 \times 10^4}{3600} = \frac{720,000}{3600} = 200\text{ m}^3/\text{s}$.
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