Section 4: Soil and Water Conservation Engineering
Soil and Water Erosion
Subtopic: Soil loss estimation
Question Statement:
The soil loss from a field with 5% slope and for crop management factor of 0.25 is 44.80 Mg ha⁻¹. Contouring along with crop management factor of 0.15 is adopted as the soil conservation measure in the field. The changed soil loss from the field is
Options:
(A) 1.61 Mg ha⁻¹
(B) 2.68 Mg ha⁻¹
(C) 16.12 Mg ha⁻¹
(D) 26.87 Mg ha⁻¹
Official Answer Key:
D
Step-by-Step Solution & Explanation
Under the USLE, soil loss is directly proportional to the C (cover-management) factor when all other factors (R,K,LS,P) are unchanged. New soil loss = 44.80×(0.15/0.25) = 26.87 Mg ha⁻¹. (B) mistakenly scales by (0.15)² or by an unrelated ratio.
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