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drainage. All drainage calculations were made using the Rational Method identified in the Mile <br /> High Flood Control District. <br /> Table G-3. Drainage Calculations <br /> Drainage <br /> Site Runoff 100-Yr 24-Hr Discharge Detention Capacity <br /> Condition Area(ac) Flo <br /> Coefficient Runoff(ac-ft) m Rate <br /> (ac-ft)*** <br /> Base 60.8 0.5 6.1 15,450 N/A <br /> Mine 60.8 0.9 11.0 1000-3000** 191.5 <br /> Reclamation 60.8 0.9 11.0 0 191.5 <br /> Drainage <br /> Site Runoff 100-Yr 24-Hr Discharge Lake Storage <br /> Condition Area(ac) Flo <br /> Coefficient Runoff(ac-ft) (gpm Rate <br /> Capacity(ac-ft)*** <br /> Base 22.4 0.5 2.3 5,300 N/A <br /> Mine 22.4 0.9 4.2 1000-3000** 71.6 <br /> Reclamation 22.4 0.9 4.2 0 71.6 <br /> Drainage <br /> Site Runoff 100-Yr 24-Hr Discharge Lake Storage <br /> Condition Area tac) Flo Rate <br /> Coefficient Runoff(ac-ft) (gpm Capacity(ac-ft)*** <br /> Base 107.8 0.5 10.8 27,400 N/A <br /> Mine 107.8 0.9 19.4 1000-3000** 146.8 <br /> Reclamation 107.8 0.9 19.4 0 146.8 <br /> *The discharge flow rate is calculated from the peak discharge of the 100-Yr 24-Hr storm event. <br /> **Discharge flow rate is variable and controlled during mining as all discharges are pumped from the settling <br /> pond. <br /> ***Detention Capacity calculated in CAD. <br /> Ewing Gravel Pit <br /> August 2023 G'5 Lewicki&Associates <br />