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<br />vary with time. Hence, these drainage channels have been <br />conservatively sized to carry maximum peak discharge that may <br />be anticipated during the life of the refuse disposal faci- <br />lity. <br />4.3 Methodology to Compute Peak Discharge <br />The peak discharges for various channels were computed using <br />the Soil Conservation Service (SCS) method, as presented in <br />Technical Release 55 (3). <br />4.4 Perimeter Channels <br />As shown on Drawing No. MG-R-C-001, the final refuse pile <br />will drain in both the east and west directions. The east <br />perimeter channel will receive run-off from approximately <br />21.6 acres and the west perimeter channel from approximately <br />23 acres when the final pile configuration is complete. A <br />peak discharge for each channel of 40 cfs was obtained using <br />the SCS method. A triangular channel with side slopes of <br />2H:1V will carry the design flow of 40 cfs at a normal depth <br />of 1.5 feet with a slope of five percent. As stated pre- <br />viously, the perimeter channels will have slopes ranging from <br />approximately 5 to 15 percent. A total depth of two feet <br />will provide a minimum free board of 0.5 feet. The computed <br />velocity will be on the order of 10 feet per second. De- <br />tailed computations are presented in Appendix A. As dis- <br />14 <br /> <br />--j <br />1 <br />_i <br />• <br />I <br />~_ . <br />