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Table 2 -A <br />CORRUGATED METAL PIPE (CMP) <br />Culvert Requirements Resulting from <br />100 - Year /24 -11our Rainfall Event <br />For Entrance Road <br />Culvert <br />Basin # <br />Design <br />Slope <br />Flow <br />Calculated <br />Recommended <br />Maximum <br />No. <br />Contributing <br />Q, cfs <br />of <br />Velocity, <br />Culvert <br />Culvert Size, <br />Culvert <br />Flow <br />Culvert <br />fps <br />Size, <br />inches <br />Capacity, cfs <br />( @�ign Q <br />inches <br />for <br />Recommend <br />W Culvert) <br />1 <br />3 <br />12.2 <br />2.86 <br />3.88 <br />24 <br />24 <br />17.70 <br />2 <br />5 <br />6.7 <br />2.86 <br />5.88 <br />18 <br />18 <br />9.52 <br />3 <br />6 <br />2.4 <br />2.20 <br />3.14 <br />18 <br />18 <br />9.55 <br />4 <br />8 <br />3.2 <br />2.20 <br />4.45 <br />18 <br />18 <br />9.55 <br />5 <br />11 <br />5.6 <br />1.00 <br />1.78 <br />24 <br />24 <br />17.25 <br />6 <br />12 <br />1.4 <br />1.00 <br />1.12 <br />18 <br />18 <br />8.46 <br />Table 2 -f3 <br />SMOOTH INTERIOR HDPE <br />Culvert Requirements Resulting from <br />100- Year /24 -Flour Raillrfall Event <br />For Entrance Road <br />Calvert <br />Basin # <br />Design <br />Slope <br />Flow <br />,Calculated <br />Recommended <br />Maximum <br />No. <br />Contributing <br />Q, cfs <br />of <br />Velocity, <br />Culvert <br />Culvert Size, <br />Culvert <br />Flow <br />Culvert <br />fps <br />Size, <br />inches <br />Capacity, cfs <br />( @ Design Q <br />inches <br />for <br />Recommend <br />ed Culvert) <br />1 <br />3 <br />12.2 <br />2.86 <br />3.88 <br />24 <br />24 <br />23.58 <br />2 <br />5 <br />6.7 <br />2.86 <br />4.72 <br />18 <br />21 <br />22.21 <br />3 <br />6 <br />2.4 <br />2.20 <br />3.14 <br />18 <br />18 <br />12.78 <br />4 <br />8 <br />3.2 <br />2.20 <br />7.23 <br />18 <br />18 <br />12.78 <br />5 <br />11 <br />5.6 <br />1.00 <br />6.27 <br />21 <br />21 <br />17.09 <br />6 <br />12 <br />1.4 <br />1.00 <br />1.12 <br />1 18 <br />18 <br />12.74 <br />Operational Site Analysis <br />The analysis of the operational site began with delineating the offsite basins contributing drainage flow <br />toward the site and the basins within the site. The offsite flows generated from the undeveloped area west <br />and uphill of the operations site, Drainage Basins l and 2, shown on Figure 7, will be intercepted by two <br />detention ponds located on the west side of the operations site at the foot of the hill above the operations <br />area. The objective will be to prevent off site flows from these areas to flow into the operational area. <br />Drainage flows generated on site will be directed to detention ponds located within the operations area. <br />See Figure 6- Mine Operation Area for pond locations and see Figure 5 for drainage sub -basin <br />delineations. Ponds are identified as Pond #1 through Pond #5 in the Figure 6. <br />IN <br />