Soil and Water Erosion

In the Universal Soil Loss Equation (USLE: $A = R \cdot K \cdot LS \cdot C \cdot P$), the standard unit plot on which the soil erodibility factor $K$ is empirically determined has:

Options:

• (A) Length $22.13\text{ m}$ ($72.6\text{ ft}$), uniform slope $9.0\%$, continuous clean-tilled fallow up-and-down the slope
• (B) Length $100.0\text{ m}$, uniform slope $5.0\%$, permanent dense Bermuda grass cover
• (C) Length $50.0\text{ m}$, slope $15.0\%$, contour graded bunds
• (D) Length $10.0\text{ m}$, slope $0.5\%$, saturated paddy condition