Allied & ICAR Exam Bank • ALLIED_0478 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Watershed Morphometry

Subtopic: Watershed Morphometry

Question Statement:

The elongation ratio $R_e$ of a watershed is defined as the ratio of diameter of a circle of the same area as the basin to:

Options:

  • (A) The maximum basin length ($L_b$)
  • (B) The perimeter of the basin
  • (C) The main stream width
  • (D) The mean elevation

Answer Key:

A

Step-by-Step Solution & Explanation

Elongation ratio is $R_e = \frac{2}{L_b} \sqrt{\frac{A}{\pi}}$. Values near $1.0$ indicate circular basins; lower values indicate elongated basins.
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