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r <br />~ $ <br />calculated for each storm during a period of time, the summation of the R values <br />gives an aazma~lateri R value for that time period. <br />Soil EYrodibility (K1 <br />'Eae soil factor (K) is an P T ~*+*a~ ly derived coefficient for stand?**i <br />conditions. Sr~*+~a**j amditions axe: slope gradient - 9$; slope length - 72.6 <br />feet; and a surface oonditio~n equivalent to cultivated, oontiraious fallow; up and <br />down slope plax~irx3. Under ~tar,riarri conditions L = S = C = P = 1. <br />FxLmm eXperi,oAn*ai plots: <br />K= A <br />RLSCP <br />or, for ~a~a~ conditions, K = R ' <br />For situations where experimental plot data is not available, a simple <br />nomograph has been developed usi~ soil structure class, peroent silt plus <br />percent very fine sand; peroes~t sand, percent organic matter, and permeability <br />class. <br />~1e soil erodibility factor, K, was developed to acoamt for variability in <br />the natural ~+~ ~~+*ihility of different soils to erosion. Soil texture, <br />structure, organic matter content, and permeability are physical and <br />r mir,p,aiogical soil characteristics which affect erodibility. K-values for the <br />soils in most counties in the United States are tabulated in county soil surveys. <br />Where surveys are unavailable or where more accurate estimates are desired, <br />analyses of site-specific soil samples should be done. <br />Slone-Lernth Factor (LS1 <br />'II~e slope lerxltli and steepness factor, LS, represents the contribution of <br />topography to the erosion p~xvices. Both the length and steepness of a land slope <br />