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JD-8 Mine-Drainage Design Plan <br /> • TABLE OF CONTENTS <br /> 1. INTRODUCTION 1 <br /> 1.1 Purpose 1 <br /> 1.2 Background -Lower Runoff Areas and Routing 1 <br /> 1.3 Background-Upland Runoff Areas 2 <br /> 2. DESIGN CRITERIA AND METHODOLOGY 5 <br /> 2.1 Design Storms 5 <br /> 2.2 Run-on/Run-off Volumetric Estimates 5 <br /> 2.3 Run-on/Run-off Peak Discharge Estimates 6 <br /> 2.4 Channel Design 6 <br /> 2.5 Culvert Design 6 <br /> 2.6 Spillway Design 6 <br /> 2.7 Riprap/Granular Bedding/Gravel Mulch 6 <br /> 3. DIVERSION DRAINAGE 7 <br /> 3.1 Storm Water Routing from Upland Areas 7 <br /> 3.2 100-year 24-hour Routing Capacity for Upland Areas 7 <br /> 3.3 10-year 24-hour Runoff and Retention for Affected Area 9 <br /> 3.4 100-year 24-hour Routing Capacity 10 <br /> 4. OPERATIONAL AND POST-MINING DRAINAGE CONDITIONS 11 <br /> 4.1 Runoff Areas and Routing 11 <br /> 4.2 10-year 24-hour Runoff and Retention for Post-Mining Condition 13 <br /> 4.3 100-year 24-hour Routing Capacity 13 <br /> 5. REFERENCES 16 <br /> LIST OF TABLES <br /> Table 1. Sub-Basin Areas at the JD-8 Mine under Current Conditions 1 <br /> Table 2. Upland Non-Contributing Drainage Areas 2 <br /> Table 3. Recurrence Interval for Design Storms 5 <br /> Table 4. Non-Contributing Drainage Peak Discharge(Qioo) 8 <br /> Table 5. Diversion Drainage Structure Parameters 8 <br /> Table 6. Site Runoff for 10-yr 24-hour Storm Calculated Using SCS Method 9 <br /> Table 7. Planned Dimensions for Storm Water Retention Pond 1 10 <br /> Table 8. Planned Dimensions for the Expanded Storm Water Retention Pond 2 10 <br /> Table 9. Mine Site Current Conditions-Peak Discharge(Qioo) 10 <br /> Table 10. Mine Site Planned Drainage Structure Parameters 11 <br /> �� Table 11. Drainage Basin Areas-Planned Final Topography 13 <br /> Table 12. Calculated 10-year 24-hour Runoff based on Planned Final Topography 13 <br /> 4122A.120702 Whetstone Associates• <br />