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• INTRODUCTION <br />As part of the final reclamation plan for the Seneca II Mine, this appendix outlines the design <br />procedures and final designs for postmining drainage channels located on the site. The designs are <br />for both planned and existing channels. <br />The locations of the channels are shown on Exhibit 7-19, Postmining Drainage Control. The <br />profiles for each channel are shown on Exhibit 7-20, Postmining Channel Profiles. Appendix A <br />contains the postmine hydrologic demonstrations and Appendix B contains the hydraulic <br />calculations for all ditches. Appendix C contains the culvert designs. <br />The following channels were designed : <br />• SII PM-7 • SII PM-Sa • SII PM-15 <br />• SII PM-2 SII PM-8b SII PM-16 <br />• SII PM-3 • SII PM-9 • SII PM-17 <br />• SII PM-4 • SII PM-70 • SII PM-18 <br />• SII PM-5 • SII PM-11 • SII PM-]9 <br />• SII PM-6 • SII PM-72 • SII PM-20 <br />• SII PM-6a • SII PM-12a SII PM-21 <br />• SII PM-6b • SII PM-]3 • SII PM-22 <br />• SII PM-7 • SII PM-74 • S1I PM-23 <br />• • SII PM-8 <br />All of the channels will be permanent and were designed to control the peak discharge from the 70- <br />year, 24-hour storm event. Because parts of channel SIIPM-4 is adjacent to a fill azea, it was <br />designed to control the peak discharge from the 700-year, 24-hour storm event. Also, because the <br />total watershed for the lower part of channel SIIPM-1 is greater than one square mile, it was designed <br />to conuol the peak discharge from the 100-year, 24-hour storm event. <br />In addition to the permanent channels, the following misting culverts were evaluated as permanent <br />stmctures: <br />• ZA • 18A • 45A <br />• 2AA • 19A • 47A <br />• 3A • 24A • 62A <br />• 9A • 29A • A3 <br />• 12A • 30A • AS <br />• 13A • 32A <br />• 15A • 33A <br />The location of the culverts are shown on Exhibit 7-] 9, Postmining Drainage Control. Appendix <br />C contains the hydraulic calculations for permanent culverts, while Appendix 12-2 contains all <br />• original culvert designs. <br />TR-36 7-12-1 Revised 11/04 <br />