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Illustration 1. Computation of SSF with All Potential Items. <br />• EXEu`tPLE ONE* <br />EROSIONAL FEATURE ~ POTENTIALLY I IDENTIFIED ~ POSSIBLE <br />I PRESENT I FACTORS I FACTOR <br />I I I <br />Soil Movement I Yes I 11 I 14 <br />Surface Litter I Yes I 8 I 14 <br />Surface Rock Fragments I <br />I Yes I 8 <br />I I 14 <br />I <br />Pedestalling I <br />I Yes I 11 <br />I I 14 <br />I <br />Flow Patterns I <br />I Yes I 12 <br />I I 15 <br />I <br />Rills I Yes I 0 I 14 <br />• Gullies I Yea I 0 I 15 <br />I ~ I <br />TOTAL I I 50 I 100 <br />I I I <br />Total SSF 100 x 100 50 <br />*Example one represents an area where all seven erosional features are <br />potentially present. (Example one is shown in Figure 2.) <br />When all seven erosional features are measured for an area, the sum of <br />the SSF values for all seven features is divided by 100, and that <br />quotient is multiplied by 100 to express the composite SSF values on a <br />percentage basis. One hundred is used in the denominator of the <br />fraction in this equation simply because it is the maximum SSF sum <br />obtainable in the method. Therefore, as shown in Illustration 1, when <br />all seven features are evaluated the composite SSF value is equal to <br />the sum of the individual SSF values. The numerical value for the <br />composite SSF value of 50 obtained for example one, in Illustration 1, <br />puts that area in the moderate erosion condition class which is <br />defined by SSF composite value limits between 41 and 60. <br />• <br />17 <br />__-- ..-- <br />