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In examples two and three shown in Illustrations 2 and 3, fewer than <br />the maximum of seven erosional features were represented in the areas <br />• and, therefore, could not be measured. When such is the case, the <br />composite SSF value is calculated by dividing the sum of the SSF <br />values of those features actually measured by the sum of the maximum <br />possible SSF values, and multiplying that quotient by 100. By this <br />method the composite SSF value for example two is 33, which places the <br />area in the middle portion of the slight erosion condition class whose <br />Iimits are between 21 and 40. Had the sum of the SSF values been <br />divided by 100 instead of 72, the composite SSF value would have been <br />24, and the area would have been classified as more stabilized. <br />Likewise, for example 3, the composite SSF value is 66 based on the <br />exclusion of the three features not measured, whereas it would have <br />only been 37 if the sum of the SSF values for the four items measured <br />would have been divided by 100. <br />Table l0 is a chart for determining the composite SSF value when fewer <br />than seven of the erosional features are measured for an area. The <br />formula for this calculation is: Y X1/X2 x 100. Where Y is the <br />composite SSF value, X1 is the sum of the measured individual <br />erosional feature SSF values, and X2 is the sum of the maximum SSF <br />values for those features measured for the area. X2 will always be <br />greater than 56 because it is for the four factors always measured, <br />namely, surface soil movement (14), surface litter movement (14), <br />pedestalling (14), and surface flow pattern (14). Whenever all seven <br />features are measured, X2 will be 100. <br />u <br />21 <br />