Allied & ICAR Exam Bank • ALLIED_0411 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Hydrology and Runoff

Subtopic: Hydrology and Runoff

Question Statement:

A watershed has potential retention $S = 50\text{ mm}$. For a rainfall event of $P = 70\text{ mm}$, since $P > 0.2S = 10\text{ mm}$, the direct runoff depth $P_e$ in mm is (rounded off to two decimal places):

Answer Key:

32.73

Step-by-Step Solution & Explanation

$P - 0.2S = 70 - 10 = 60\text{ mm}$. $P + 0.8S = 70 + 40 = 110\text{ mm}$. $P_e = \frac{60^2}{110} = \frac{3600}{110} = 32.727\text{ mm} \approx 32.73\text{ mm}$.
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