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• Contents <br />Section 1 Introduction <br />1.1 Location ...................................................................................................1-1 <br />1.2 Procedure and Approach ......................................................................1-1 <br />Section 2 Drainage Control Design <br />2.1 Existing Drainage Conditions .............................................................. 2-1 <br />2.2 Drainage Plan ......................................................................................... 2-1 <br />2.3 Peak Discharge Estimate ....................................................................... 2-1 <br />2.4 Surface Water Control Structure Design ............................................ 2-2 <br />2.4.1 Channel Design ....................................................................... 2-2 <br />2.4.2 Berm Design ............................................................................ 2-3 <br />Section 3 Conclusions and Recommendations <br />Section 4 References <br />Appendices <br />Appendix A USGS Regional Flood-Frequency Equations for Colorado <br />Appendix B Colorado Isopuvials of 100-yr 24-hr Precipitation in Tenths <br />of an Inch (NOAA Atlas 2 Volume 3) <br />Appendix C NRCS Soil Map and Soil Type Description for the Van 4 <br />Mine Area <br />Exhibits <br />Exhibit A Van 4 Mine Surface Facility Area Drainage Plan and Details <br />Exhibit B Van 4 Mine Surface Facility Area Drainage Plan and Details <br />with Aerial Photograph <br />0 <br /> <br /> <br />TA64986-Denison MineslTask Order I • Sunday Mines Drainage StudylVan 4 Mine Drainage Study%RepodlVan4 Mine Drainage Repod.doo