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TABLE 13-3-7 <br />Weighted "k" Factor <br />Pond 005 - SuS-3 <br /> 2V0 0.26 5.3 1.38 <br /> 46D 0.22 0.9 0.20 <br /> XBF 0.25 10.4 2.60 <br /> 11D 0.27 0.9 0.24 <br /> 35E 0.24 1.0 0.24 <br /> 12D, 12E 0.25 0.7 0.17 <br /> 66D 0.25 0.1 0.03 <br /> 34D 0.2L 1.3 0.31 <br /> Haul Road 0.24 11_1 2.66 <br /> Total 31.7 7.83 <br /> Weighted Average k 7 _03 = 0.247 <br /> 31 .7 <br />• Preci pita tion and Storm Type. Th e precipitation amounts at the Seneca II- W Mine permit <br /> <br /> area for the 10-yea r, 25-year, and 100-year storms were obtained from HOAR Precipitation <br /> Frequency Atlas Precipitation - Freouencv Atlas of the western States - Volume 11 - <br />Colorado, 1973. A standard SCS Type II storm was utilized for each analysis <br />Unit Nydro9ra oh and Surface Condition. The SED CAD computer program provides three unit <br />hydrog raph shapes to choose from in determining the runoff characteristics of a watershed. <br />Time of Concentration. The time of concentration, [c, is defined as the time required for <br />water to flow from the hydraulically most remote point in the watershed to the watershed <br />outlet. <br />The time of concentration far Pond 005 was calculated using the SEDCAD computer program. <br />The program determines overland flow [o a pond structure by u:ilizinB the Seven SLS Upland <br />Curves which yield velocity as a function of slope and land use (Barfield e[ al., 1983). <br />Listed below is a summary of the time of content ration for the subwatersheds. <br /> <br />13-3-7 Revised 03/13/92 <br />