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Table 7. Classes for Frequency and Distribution of Rills <br />• SSF <br />Class Description Value <br />Stable Rills, if present, are mostly less 0 or 3 <br />than .5 in. (13 mm) deep, and <br />generally at infrequent intervals <br />over 10 ft. <br />Slight Rills are mostly .5 to 1 in. (13 6 <br /> to 25 mm) deep, and generally at <br /> infrequent intervals over !0 ft. <br />Moderate Rills are mostly 1 t o 1.5 in. 9 <br /> (25 to 38 mm) deep, and at 10 ft. <br /> intervals <br />Critical Rills are mostly 1.5 to 3 in. 12 <br /> (38 to 76 mm) deep, and at <br /> intervals of 5 to 10 ft. <br />Severe Rills are mostly 3 t o 6 in. (76 14 <br /> to 152 mm) deep, and at intervals <br /> of less than 5 ft. <br />See Illustration 3 for calculation of SSF if there is no potential for <br />• rills. <br />LJ <br />13 <br />