Question Bank • QB_SWCE_EXP_047 NAT • 1 Mark

Section 4: Soil and Water Conservation Engineering

Watershed Management

Subtopic: Watershed characterization and land use capability classification

Question Statement:

A watershed has a total basin area of $120\text{ km}^2$ and the maximum basin length measured parallel to the main stream is $15\text{ km}$. The Form Factor ($R_f = A / L^2$) of the watershed is ________ (round off to 2 decimal places).

Answer Key:

0.53

Step-by-Step Solution & Explanation

Form factor is given by: $R_f = \frac{A}{L^2} = \frac{120}{15^2} = \frac{120}{225} = 0.5333 \approx 0.53$
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