Allied & ICAR Exam Bank • ALLIED_0903 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Watershed Morphometry

Subtopic: Watershed Morphometry

Question Statement:

Form Factor $R_f$ of a drainage basin of area $A$ and basin length $L_b$ is expressed as:

Options:

  • (A) $R_f = \frac{A}{L_b^2}$
  • (B) $R_f = \frac{L_b^2}{A}$
  • (C) $R_f = \frac{A}{P^2}$
  • (D) $R_f = \frac{L_b}{\sqrt{A}}$

Answer Key:

A

Step-by-Step Solution & Explanation

Form factor is the ratio of basin area to square of basin length ($R_f = A / L_b^2$). Lower values indicate narrow, elongated basins with lower peak flood spikes.
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