Which factor(s) of RUSLE can be based on site-specific analysis rather than maps?

Which factor(s) of RUSLE can be based on site-specific analysis rather than maps?

• A. R, C
• B. K, LS
• C. C, P
• D. S, E

Answer: (B)

In RUSLE, some factors reflect local soil properties and terrain that you can determine directly from the site, rather than relying on broad map data. The soil erodibility factor (K) measures how easily the soil can be detached, which depends on soil characteristics such as texture, structure, organic matter, and permeability. You can collect soil samples from the field and analyze them to get a site-specific K value. The topographic factor (the combination of slope length and slope steepness, LS) reflects how the shape of the land influences erosion. You can measure the actual slope length and gradient on the site or from a precise on-site survey to compute LS, yielding a value tailored to that location. In contrast, factors like rainfall erosivity (R) come from climatic data and are typically represented by regional rainfall records or maps, while cover-management (C) and support practice (P) factors are tied to vegetation cover and land-management practices, which are often adapted or generalized from maps or management inventories. Thus, the factors that lend themselves to site-specific analysis rather than maps are the soil erodibility and the topographic (LS) components.

In RUSLE, some factors reflect local soil properties and terrain that you can determine directly from the site, rather than relying on broad map data. The soil erodibility factor (K) measures how easily the soil can be detached, which depends on soil characteristics such as texture, structure, organic matter, and permeability. You can collect soil samples from the field and analyze them to get a site-specific K value. The topographic factor (the combination of slope length and slope steepness, LS) reflects how the shape of the land influences erosion. You can measure the actual slope length and gradient on the site or from a precise on-site survey to compute LS, yielding a value tailored to that location.

In contrast, factors like rainfall erosivity (R) come from climatic data and are typically represented by regional rainfall records or maps, while cover-management (C) and support practice (P) factors are tied to vegetation cover and land-management practices, which are often adapted or generalized from maps or management inventories. Thus, the factors that lend themselves to site-specific analysis rather than maps are the soil erodibility and the topographic (LS) components.