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INTRODUCTION 1 <br />SYSTEM DESCRIPTION 3 <br />PROBABLE MAXIMUM FLOOD DISCHARGES 6 <br />Precipitation 6 <br />Unit Hydrograph 6 <br />Infiltration 7 <br />Base Flow 9 <br />Antecedent Conditions 9 <br />Tailing Pond 10 <br />RESULTS OF FLOOD MODELING DURING THE PMF 12 <br />POST FLOOD CONSIDERATIONS 14 <br />Tailing Pond Embankment Stability 14 <br />Bypass System Operation 14 <br />Methods of Floodwater Removal 15 <br />Post -Flood Storage Allowance 17 <br />Time to Dewater System 17 <br />SUMMARY 18 <br />FIGURES <br />APPENDIX A- Applicability of the Probably Maximum Precipitation (PMP) Portion of the Study Titled <br />"Site- Specific Meteorological and Hydrological Study of the Williams Fork Drainage <br />Basin" for the Henderson Mill Tailing Pond Drainage Basin — February 2001, by <br />Applied Weather Associates. <br />APPENDIX B - "Henderson Dam Seepage and Stability Analysis for Elevated Decant Pond <br />Conditions" - July 2001, by URS Corp. <br />APPENDIX C- HEC -1 Model Run Output <br />TABLE OF CONTENTS <br />i <br />