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West Elk Mine - Mine Water Control Plan Mountain Coat Company <br />• TABLE OF CONTENTS <br />1.0 INTRODUCTION ..................................................................................................................1 <br />1.1 Project Description .......................................................................... ..........................1 <br />1.2 Analysis Methods ............................................................................ ..........................1 <br />1.3 Design Criteria ................................................................................ ..........................1 <br />2.0 SEDCAD+ INPUT PARAMETERS APPLICABLE TO ENTIRE PROJECT ..........................2 <br />2.1 Storm Type ..................................................................................... ..........................2 <br />2.2 Rainfall Depth .................................................................................. ..........................2 <br />2.3 Structure Naming Convention ......................................................... ..........................2 <br />3.0 SEDCAD+ INPUT PARAMETERS FOR SUBWATERSHEDS ................... ..........................3 <br />3.1 Subwatershed Boundary ................................................................. ..........................3 <br />3.2 Soil Type & Land Cover .................................................................. ..........................3 <br />3.3 Subwatershed Hydrologic Parameters ............................................ ..........................4 <br />3.3.1 Hydrologic Soil Group ................................................................... ............................. 4 <br />3.3.2 Curve Number ............................................................................... .............................4 <br />3.3.3 Time of Concentration ................................................................... .............................4 <br />3.3.4 Muskingum Routing Parameters ................................................... .............................4 <br />3.3.5 Hydrograph Response Shape ....................................................... .............................5 <br />3.4 Subwatershed Sediment Parameters .............................................. .......................... 5 <br />• 3.4.1 Soil Erodibility Factor, K ................................................................ .............................5 <br />3.4.2 Length-Slope Factor, LS ............................................................... ............................. 5 <br />3.4.3 Control Practice Factor, CP .......................................................... ............................. 5 <br />3.4.4 Particle Size Distribution ............................................................... ............................. 6 <br />4.0 SEDCAD+ INPUT PARAMETERS FOR STRUCTURES ......................................................7 <br />4.1 Ditches ...................................................................................................................... 7 <br />4.2 Culverts .....................................................................................................................7 <br />4.3 Muskingum Routing ...................................................................................................7 <br />4.4 Ponds ........................................................................................................................7 <br />5.0 SEDCAD+ OUTPUT / RESULTS ......................................................................................... 8 <br />5.1 Ponds ........................................................................................................................8 <br />5.2 Subwatersheds ......................................................................................................... 8 <br />5.3 Ditches and Culverts ................................................................................................. 8 <br />5.4 Small Area Exceptions and Other Exemptions .......................................................... 8 <br />APPENDIX A: OUTPUT SUMMARY TABLES <br />• <br />Tetra Tech Date i