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• forest litter 75-85% of area <br />2.5 PRACTICE FACTOR. P <br />The practice factor is used to account for conservation practices for the watershed. The practice factor is <br />typically used for agricultural lands and rangelands, not for disturbed lands (Haan, 1994). Therefore <br />practice factors were set to 1.00 for all areas. <br />2.6 SEDIMENT PARTICLE DISTRIBUTION <br />A general sediment <br />size consist was developed based on the weighted average of physical analysis data results for mine <br />areas. The following general size consist was agreed upon between the DMG and Colowyo: <br />Sand 27 percent <br />Silt 40 percent <br />Clay 33 percent <br />A sediment distribution was generated from the general size consist, as noted above, and input to the <br />SEDCAD4 program. The resulting sediment distribution is shown on the SEDGAD4 printouts and <br />illustrated by the attached grain size distribution graph. <br />3.0 POND GEOMETRY INPUT PARAMETERS <br />Pond dimensions and input parameters were obtained from scaled drawings generated from pond as-built <br />surveys. The input parameters are shown on the SEDCAD4 printouts and summarized in Table 6. <br />4.0 POND CLASSIFICATIONS AND SPILLWAY EVALUATIONS <br />The classifications for the three proposed ponds are SEO Class II Small Dam, under Rule S.A.(5)(b). In <br />compliance with SEO regulations, the emergency spillways were sized to pass 50 percent of the PMP. <br />5.0 POND DESIGN EVALUATION RESULTS <br />The results of the pond design analyses are summarized in Table 4. The supporting SEDCAD4 analyses <br />and watershed maps aze presented as attachments in each of the individual pond design sections <br /> <br />Exh. 7-20-5 Revision Date; 3/29/07 <br />Revision No.: PR-02 <br />