Allied & ICAR Exam Bank • ALLIED_1176 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Watershed Morphometry

Subtopic: Form Factor

Question Statement:

A watershed of area $A = 50\text{ km}^2$ has an axial basin length $L = 10\text{ km}$. The Horton form factor $R_f = A / L^2$ is:

Answer Key:

0.50

Step-by-Step Solution & Explanation

$R_f = \frac{A}{L^2} = \frac{50}{10^2} = \frac{50}{100} = 0.50$. (A smaller form factor indicates an elongated basin with flatter peak hydrographs).
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