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Table G-3 Drainage Calculations <br /> Drainage <br /> Lake <br /> Site Area Curve 5-Yr 24-Hr 100-Yr 24-Hr Discharge Flow Rate Storage <br /> Condition (ac) Number Runoff(ac-ft) Runoff(ac-ft) (gpm)* Capacity <br /> ac-ft *** <br /> Base 62.5 80 0.75 3.129 0 64.5 <br /> Mine 62.5 84 1.23 4.138 1000-3000** 451.6 <br /> Reclamation 1 62.5 85 1.40 4.493 0 87.2 <br /> Drainage <br /> Lake <br /> Site Area Curve 5-Yr 24-Hr 100-Yr 24-Hr Discharge Flow Rate Storage <br /> Condition (ac) Number Runoff(ac-ft) Runoff(ac-ft) (gpm)* Capacity <br /> ac-ft *** <br /> Base 28.7 88 0.86 2.418 15,980 N/A <br /> Mine 28.7 88 0.87 2.446 1000-3000** 179.6 <br /> Reclamation 1 28.7 92 1.29 3.111 0 19.8 <br /> Drainage <br /> Lake <br /> Site Area Curve 5-Yr 24-Hr 100-Yr 24-Hr Discharge Flow Rate Storage <br /> Condition (ac) Number Runoff(ac-ft) Runoff(ac-ft) (gpm)* Capacity <br /> ac- <br /> Base 39.2 79 0.41 1.820 11,100 N/A <br /> Mine 39.2 87 1.06 3.108 1000-3000** 579.0 <br /> Reclamation 39.2 95 2.36 5.058 0 31.2 <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 /> ***The lake storage capacity is calculated in CAD from the top of groundwater to the lowest point of the pond <br /> edge. <br /> Delta Paving Gravel Pit G-6 Lewicki g/Associates <br /> September 2022 <br />