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JD -7 Mine - Drainage Design Plan <br />5.3 Diversion Structure Capacity ............................................................... ............................... 47 <br />5.4 Diversion Structure Stability ................................................................ ............................... 48 <br />5.5 Retention Structure Capacity 49 <br />5.6 Retention Pond Expansion ................................................................... ............................... 53 <br />5.7 Culvert Capacity ................................................................................... ............................... 55 <br />6. STORMWATER ROUTING (PLANNED CONDITION) ..................................... ............................... 56 <br />6.1 <br />Sub -Basin Delineation - Planned ......................................................... ............................... <br />57 <br />6.2 <br />Stormwater Routing on the Expanded and Reclaimed JD -7 Mine Site ............................... <br />60 <br />6.3 <br />Reach Definition - Planned .................................................................. ............................... <br />62 <br />6.3.1 Pit Diversion West - Planned .................................................. ............................... <br />62 <br />6.3.2 Pit Diversion East - Planned .................................................... ............................... <br />62 <br />6.3.3 Open Pit Waste Rock Pile Diversion - Planned ...................... ............................... <br />65 <br />6.3.4 North Diversion - Planned ....................................................... ............................... <br />65 <br />6.4 <br />Storage Structures (Planned) ................................................................ ............................... <br />65 <br />6.4.1 Planned Stormwater Catchment Northwest (SCN) ................. ............................... <br />65 <br />6.4.2 Upstream Storage Ponds ( USPs) ............................................. ............................... <br />67 <br />6.5 <br />Model Implementation of Stormwater Routing ................................... ............................... <br />68 <br />7. PEAK FLOW MODEL RESULTS (PLANNED CONDITION) ............................ ............................... 71 <br />7.1 Runoff Results - Peak Flow and Total Volume ................................... ............................... 71 <br />7.2 Diversion Structure Capacity ............................................................... ............................... 76 <br />7.3 Diversion Structure Stability ................................................................ ............................... 79 <br />7.4 Retention Structure Capacity 81 <br />8. ADDITIONAL STORMWATER BMPS ................................................................ ............................... 84 <br />9. REFERENCES ........................................................................................................ ............................... 86 <br />LIST OF TABLES <br />Table 1. Major Sub -Basin Areas at the JD -7 Mine ......................................................... ............................... t <br />Table2. Terms and Abbreviations .................................................................................. ............................... 4 <br />Table3. Design Storm Parameters .................................................................................. ............................... 6 <br />Table 4. Regression Equations for Southwestern Colorado .......................................... ............................... 11 <br />Table 5. Generalized Least Squares Regression Equations for Estimating Regional Flood- Frequency <br />Relations for Western Colorado ................................................................... ............................... 12 <br />Table 6. Manning's "n" Values Used in Cowan's Method for Channel Roughness ..... ............................... 13 <br />Table 7. Soils Types in Vicinity of the JD -7 Mine ........................................................ ............................... 17 <br />Table 8. Runoff Curve Numbers for Arid and Semi -Arid Rangelands ......................... ............................... 18 <br />Table 9. Runoff Curve Numbers for JD -7 Mine ........................................................... ............................... 18 <br />Table 10. Sub - Basins Contributing Non - Contact Stormwater to Diversion Structures and to the Valley <br />Floor............................................................................................................. ............................... 20 <br />Table 11. Sub - Basins Within the JD -7 Mine Permit Area ............................................ ............................... 23 <br />Table 12. Downstream Receiving Sub - Basins .............................................................. ............................... 29 <br />4149A.130926 Whetstone Associates <br />