Question Bank • QB_SWCE_EXP_027 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Hydrology

Subtopic: Runoff estimation

Question Statement:

Using the SCS-CN method, for a watershed with Curve Number $CN = 80$, the potential maximum soil retention $S$ in millimeters is ________ (round off to 1 decimal place).

Answer Key:

63.5

Step-by-Step Solution & Explanation

The SCS formula for potential maximum retention $S$ in millimeters is: $S = \frac{25400}{CN} - 254$ Given $CN = 80$: $S = \frac{25400}{80} - 254 = 317.5 - 254 = 63.5\text{ mm}$
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