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TABLE 13-SA-3 • <br />Yeighted "k" Factor <br />Pond 009 Yatershed <br />Soil Type k Area (Ac) k z Area <br /> <br />468, 46C, 46D 0.22 9.79 2.15 <br />%8D, XBE, X8F 0.25 131.23 32.81 <br />12C, 12D, 12E 0.25 4.47 1.12 <br />34C, 34D, 34E, 34F 0.24 10.17 2.44 <br />35C, 35D, 35E 0.24 8.85 Z.12 <br />53C, 53D, 53E, 53F 0.26 28.90 7.51 <br />66D, 66E, 66F 0.25 42.80 10.70 <br />101 0.08 13.82 1.11 <br />103 0.23 44.16 10.16 <br />5103 0.27 23.56 6.36 <br />Reclaimed/Topsoiled 0.26 120.80 28.99 <br /> <br /> Total 438.55 105.47 <br /> <br />Yeighted Average k = <br />105.47 = 0.24 • <br /> 438.55 <br />Precipitation end Storm Tvpe. The precipitation amounts a[ the Seneca II-Y Mine permit <br />area for the 10-year and 25-year storms were obtained from gOAA Precipitation Frequency <br />Atlas Precipitation - freauencv Atlas of the Yestern States - Volume II - Colorado, 1973. <br />A standard SCS Type II storm was utilized for each analysis. <br />Unit Hydropreoh end Surface Condition. The SEDCAD computer program provides three unit <br />hydrograph shapes to choose from in determining the runoff characteristics of a watershed. <br />The disturbed hydrograph (FAST) was used to generate a worst case hydrograph. <br />Time of Concentration. The time of concentration, tc, is defined es the time required for <br />water to flow from the hydraulically moat remote point in the watershed to the watershed <br />outlet. <br />The time of concentration for Pond 009 was calculated using the following equation • <br />(Barfield et el., 1983). <br />13-SA-4 <br />