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<br />Table 8. Classes for Frequency and Distribution of Gullies <br />I • SSF <br />Class Description Value <br />Stable No gullies, or if present, less 0 or 3 <br />than 2 percent of the channel bed <br />and walls show active erosion (are <br />not vegetated) along their length, <br />and/or gullies make up less than <br />2 percent of the total area. <br />Slight Between 2 and 5 percent of the 6 <br />channel bed and walls show active <br />erosion (are not vegetated) along <br />their length, and/or gullies make <br />up between 2 and 5 percent of the <br />total area. <br />Moderate Between 5 and 10 percent of the 9 <br />channel bed and walls show active <br />erosion (are not vegetated) along <br />their length, and/or gullies make <br />up between 5 and 10 percent of the <br />total area. <br />Critical Between 10 and SO percent of the 12 <br />• channel bed and walls show active <br />erosion (are not vegetated) along <br />their length, and/or gullies make <br />up between 10 and 50 percent of <br />the total area. <br />Severe Over 50 percent of the channel bed 15 <br />and walls show active erosion (are <br />not vegetated) along their length, <br />and/or gullies make up over SO <br />percent of the total area. <br />If gullies are not potentially present, deduct 15 rating points from a <br />possible value of 100 (shown in Illustration 3). <br /> <br />14 <br />