Allied & ICAR Exam Bank • ALLIED_1184 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Soil Erosion Mechanics and USLE

Subtopic: Topographic Factor LS

Question Statement:

In the Universal Soil Loss Equation, the standard unit plot length and slope percentage defined by Wischmeier and Smith for which $LS = 1.0$ are:

Options:

  • (A) Length 22.13 m (72.6 ft) on a 9% slope
  • (B) Length 10.0 m on a 5% slope
  • (C) Length 50.0 m on a 15% slope
  • (D) Length 100.0 m on a 2% slope

Answer Key:

A

Step-by-Step Solution & Explanation

The standard USLE calibration plot is $22.13\text{ m}$ ($72.6\text{ ft}$) long on a continuous $9\%$ slope under tilled continuous fallow.
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