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APPENDIX G-1 SURFACE WATER RUNOFF <br /> CALCULATIONS <br /> All runoff calculations were completed using the Natural Resource Conservation Service TR-55 <br /> methodology. <br /> 100-YR 24-HR Event Rainfall: 2.00 inches <br /> 1 . Baseline Conditions <br /> Drainage Basin Soil Group Land Use Curve Total 00 <br /> Number Runoff(ac-ft) (acres) <br /> 1 A/B/D Pasture,grass,or range(Fair) 53.8 0.11 221.2 <br /> 2 A Pasture,grass,or range(Fair) 49.0 0.01 113.3 <br /> 3 A Pasture,grass,or range(Fair) 49.0 0.00 6.2 <br /> 2. Mining Conditions <br /> Drainage Basin Soil . • Land Use Curve Total00 <br /> Number Runoff(ac-ft) (acres) <br /> 1 A/B/D Pasture,grass,or range(Fair) 81.3 11.3 221.2 <br /> 2 A Pasture,grass,or range(Fair) 52.0 0.03 113.3 <br /> 3 A Pasture,grass,or range(Fair) 53.5 0.003 6.2 <br /> 3. Reclamation Conditions <br /> TotalDrainage Basin Soil Group' Land Use Curve 00 <br /> Number Runoff(ac-ft) (acres) <br /> 1 A/B/D Pasture,grass,or range(Fair) 53.8 0.11 221.2 <br /> 2 A Pasture,grass,or range(Fair) 49.0 0.01 113.3 <br /> 3 A Pasture,grass,or range(Fair) 49.0 0.00 6.2 <br /> 5 Rangeland conditions are assumed for all areas due to Rule 6.5.4(2)(b). <br /> Mystic Soil <br /> October 2022 G1-1 Lewicki&Associates <br />