Question Bank • QB_EXP_SWCE_USL_010 NAT • 2 Marks

Section 4: Soil and Water Conservation Engineering

Water Erosion Mechanics & USLE

Subtopic: USLE annual soil loss estimation

Question Statement:

Using the Universal Soil Loss Equation (USLE) $A = R \cdot K \cdot LS \cdot C \cdot P$, estimate the annual soil loss for a field where rainfall erosivity factor $R = 300\text{ MJ}\,\text{mm/(ha}\,\text{h}\,\text{yr)}$, soil erodibility factor $K = 0.25\text{ t}\,\text{ha}\,\text{h/(ha}\,\text{MJ}\,\text{mm)}$, topographic factor $LS = 1.5$, cropping management factor $C = 0.20$, and conservation practice factor $P = 0.60$. The estimated annual soil loss $A$ is ________ $\text{t/(ha}\,\text{yr)}$ (round off to two decimal places).

Answer Key:

13.50

Step-by-Step Solution & Explanation

Applying USLE directly: $A = R \cdot K \cdot LS \cdot C \cdot P$ $A = 300 \times 0.25 \times 1.5 \times 0.20 \times 0.60 = 13.50\text{ tonnes/(ha}\,\text{yr)}$.
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