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<br />Page Two <br /> <br />Kath Companies <br />Hydrologic Analysis <br />June 5, 1996 <br /> <br />J1 Runoff from a 10 Year Rainfall Event (continued) <br /> <br />Weighted Curve Number: See computer output. <br /> <br />Time of Concentration: Sheet: 75 feet @ 0.01 ft/ft ave. <br />Shallow Concentrated: none <br />Channel: 295feet in 12' RCP @ <br />s=0.002 ft/ft ave. <br />See computer output. <br /> <br />Rainfall: 4.17 inches <br /> <br />Peak Runoff Rate: 7.30 cfs from computer output. <br /> <br />~ Runoff from a 100 Year Rainfall Event <br /> <br />Areas. Weighted Curve Number. and Time of Concentration are the same as for the 10 year event. <br /> <br />Rainfall: <br /> <br />5.90 inches <br /> <br />Peak Runoff Rate: <br /> <br />10.86 cfs from computer output. <br /> <br />~ Pond Sizimz. Outlet Sizimz. and Routimz of 100 Year Storm Throutlh Pond: <br /> <br />The sizing of the pond was estimated using TR-55 methods. The outlet size was selected based upon <br />the calculation of an orifice that would pass the 10 year rate at the peak head for the pond. The outlet <br />into the existing 21' rcp will be at the invert of that pipe,; the tailwater for the 100 year event is <br />assumed to be at or above the top of the 21' pipe. <br /> <br />The 100 year RainfalVRunoff event was routed through the pond. <br /> <br />Maximum Outflow Rate: <br /> <br />2..15 cfs (6.41 9Ik>-~e-.d2 <br /> <br />Maximum Pond Elevation: <br /> <br />~42.35 <br />