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<br />Page Two <br /> <br />Kath Companies <br />Hydrologic Analysis <br />April 20, 1996 <br /> <br />lh Runoff from a 10 Year Rainfall Event (continued) <br /> <br />Weighted Curve Number: See computer output. <br /> <br />Time of Concentration: <br /> <br />Sheet: <br />Shallow Concentrated: <br />Channel: <br /> <br />92 feet @ 0.01 ft/ft ave. <br />none <br />362 feet in 12" RCP @ <br />s=O,003 ft/ft ave. <br /> <br />See computer output. <br /> <br />Rainfall : <br /> <br />4.14 inches <br /> <br />Peak Runoff Rate: <br /> <br />6.41 cfs from computer output. <br /> <br />llh Runoff from a 100 Year Rainfall Event <br /> <br />Areas. Weighted Curve Number. and Time of Concentration are the same as for the <br />10 year event. <br /> <br />Rainfall: <br /> <br />6.00 inches <br /> <br />10.22 cfs from computer output. <br /> <br />Peak Runoff Rate: <br /> <br />IV, Pond Sizing. Outlet Sizim~. and RoutinR of 100 Year Storm Through Pond: <br /> <br />The sizing of the pond was estimated using TR-55 methods. The outlet size was <br />selected based upon the calculation of an orifice that would pass the 10 year rate at <br />the peak head for the pond. <br /> <br />The 100 year RainfalllRunoff event was routed through the pond. <br /> <br />Maximum Outflow Rate: 5.41_cis (6.41 allowed) <br /> <br />Maximum Pond Elevation: 942.63 <br />