Allied & ICAR Exam Bank • ALLIED_0448 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Soil Erosion Mechanics and USLE

Subtopic: Soil Erosion Mechanics and USLE

Question Statement:

The rainfall erosivity index $R$ in the Universal Soil Loss Equation (USLE) represents:

Options:

  • (A) The product of total kinetic energy of rainfall ($E$) and maximum 30-minute rainfall intensity ($I_{30}$), i.e., $EI_{30}$
  • (B) Total annual precipitation in meters
  • (C) Peak runoff rate divided by infiltration
  • (D) Soil clay percentage

Answer Key:

A

Step-by-Step Solution & Explanation

Wischmeier and Smith defined $R = \sum (E \cdot I_{30}) / 100$, where $E$ is total storm kinetic energy and $I_{30}$ is maximum 30-minute intensity.
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