I want to estimate the soil loss for my study area but there are lots of confusion. USLE require rainfall erosivity factor, soil erodibility factor, topographic factor, crop management and conservation practice factor and I am unable in getting these factors.
RUSLE has 6 factors in which R represents erosivity, ie the ability of the rainfall to erode the soil (which is the energy available with rainfall)
Other factors together called as erodibility, which is the resistance offered to the rainfall to withstand detachment of soil particles.
USLE/RUSLE estimates only the soil erosion.
Sediment yield is the quantum of soil comes out of the watershed from the eroded soil. This can be estimated through the relationship Sediment Yield = Sediment Delivery Ratio (SDR) x Soil Loss
The estimation SDR is done through several emphirical equations (refer literature)
Can i know your point of application?
What is the area of consideration?
Azura Ishak Yes, you are right sediment yield means how much sediment/soil is transported or traveled.
All these factor is site specific the best way to get all these data through empirical analysis. Otherwise you can use the secondary data from the available database related to the site.
The USLE estimates average annual soil loss by sheet and rill erosion on those portions of landscape profiles where erosion, but not deposition, is occurring.
The USLE is composed of 6 factors to predict the long-term average annual soil loss (A). The equation includes the rainfall erosivity factor (R), the soil erodibility factor (K), the topographic factors (L and S) and the cropping management factors (C and P). The equation takes the simple form:
A=RKLSCP
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