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Y <br />K =summation of the travel time for each flow segment <br />Where: Travel time is calculated by using the SCS Upland Method as <br />presented in Bafield, et al., page 100, and in the same manner <br />as is Time of Concentration, as previously described. <br />SEDIMENTOLOGY <br />Sediment yield was calculated by SEDCAD+ for single storm events and <br />converted to annual yields by the following equation: <br />V R~,~,,,, (Storm sediment yield)x(~ x / 2000 Ib~/ton <br />~R,„,,,, SW 143,560 ft=/acre <br />Where: V =annual sediment volume (acre ft/year) <br />R,,,,,,,,, =Annual Rainfall Factor <br />Rtl,,,,, =Single Storm Rainfall Factor <br />SW =Sediment Specific Weight (Ibs/ft~ <br />Annual and storm rainfall factors and sediment specific weight are explained in <br />detail under SEDCAD+ Sedimentology Inputs. The storm sediment yield (tons) <br />is a SEDCAD+ output, calculated as described below. <br />Computer printouts containing sedimentology inputs and results are contained <br />in Appendix A, SEDCAD+ Computer Printouts. Table 1, Sediment Yield <br />Comparison Summary, summarizes sediment yield results for premine and <br />postmine conditions. <br />7 <br />