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~anuary 2002 Seneca I71Y/ Sautb Expantion * Drainage and Sediment Control Plan I Page 5 <br />TABLE 3 <br />CONTROL FACTOR <br />Cover Cover T pe Ve elation Control Factor <br />Undisturbed Aspen/Mountain <br />Shrub 25% canopy 12 m fall heightl, <br />80°~ round cover 0.042 <br /> Sagebrush 25% canopy 12 m fall heightl, <br />80°~ round cover 0.042 <br /> Herbaceous No canoe , 80% round cover 0.043 <br /> Mesic Draina a No canopy, 40% ground cover 0.100 <br />Disturbed Bare Ground None 1.0 <br />3.5 PRACTICE FACTOR, P <br />The practice factor is used to account for conservation practices for the watershed. The values utilized <br />are shown in Table 4 (Renard et al, 1996)(Schwab and Warner, 1987): <br />TABLE 4 <br />PRACTICE FACTOR <br />Surface Surface T e Practice Practice Factor <br />Undisturbed Varies None 1.0 <br />Disturbed Topsoil Stripped <br />Spoil Rough and Irregular <br />Rough and Irregular 0.9 <br />0.7 <br />3.6 SEDIMENT PARTICLE DISTRIBUTION <br />A sediment particle size distribution was input into the SEDCAD computer model. The distribution <br />was obtained from previous analyses presented in the Seneca II mine permit and is shown in the <br />SEDCAD printouts. <br />MWH * 765 S. Union Baukuard, ,Suite 470 * I~kewood, Colorado 80228 * (970f 763-5140 <br />w wvUu.*/.r..,n nm r..rt/ram/ar„w.,r n. swm4./W <br />zbN rloz m' <br />