Allied & ICAR Exam Bank • ALLIED_0425 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Hydrology and Runoff

Subtopic: Hydrology and Runoff

Question Statement:

In a catchment, the coefficient of variation of rainfall among existing gauges is $C_v = 30\%$. For an allowable error in estimation of mean precipitation $p = 10\%$, the optimum number of rain gauge stations $N = (C_v / p)^2$ is:

Answer Key:

9

Step-by-Step Solution & Explanation

$N = (30 / 10)^2 = 3^2 = 9$.
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