Allied & ICAR Exam Bank • ALLIED_0447 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Soil Erosion Mechanics and USLE

Subtopic: Soil Erosion Mechanics and USLE

Question Statement:

In the Universal Soil Loss Equation (USLE) $A = R \cdot K \cdot LS \cdot C \cdot P$, given rainfall erosivity $R = 200$, soil erodibility $K = 0.25$, topographic factor $LS = 1.6$, cropping management $C = 0.3$, and support practice $P = 0.5$. The estimated annual soil loss $A$ in tonnes/ha/yr is:

Answer Key:

12

Step-by-Step Solution & Explanation

$A = 200 \times 0.25 \times 1.6 \times 0.3 \times 0.5 = 50 \times 1.6 \times 0.15 = 80 \times 0.15 = 12.0\text{ t/ha/yr}$.
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