Allied & ICAR Exam Bank • ALLIED_0454 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Soil Erosion Mechanics and USLE

Subtopic: Soil Erosion Mechanics and USLE

Question Statement:

A windbreak or shelterbelt provides maximum wind velocity reduction and downwind protection when its optical porosity (permeability) is approximately:

Options:

  • (A) $40\%$ to $50\%$
  • (B) $0\%$ (completely solid barrier)
  • (C) $90\%$ (extremely open)
  • (D) $10\%$

Answer Key:

A

Step-by-Step Solution & Explanation

A medium-porous shelterbelt ($40-50\%$ porosity) avoids high turbulence and leeward eddy reverse-flow generated by solid barriers, providing maximum protected distance.
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