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Peak estimated stage elevation with the passage of the 25-year storm is 6789.84. This <br />• leaves d.2 fee[ o£ freeboard to the top of embankment. <br />Please refer to Addendums 13-3A-A, 13-3A-B, and 13-3A-C for capacities of both spillways <br />during passage of the 10, 25, and 100-yea[ storm events. Table 13-3A-5 presents the as- <br />built details fo[ [he p[Sncipal and emergency spillxay. <br />TABLE 13-3A-5 <br />As-Built <br />Principal and Emergency spillxay Data Summary <br />Sediment Pond 010 <br /> Principal spillxay: <br /> Type Riser Inlet ICMPI with <br /> 6^ orifice <br /> Inlet Elevation 6784.0 <br /> Length 131 feet <br /> Diameter 36" riser with a 24" <br /> barcel (6" orifice) <br /> Slope 5.8 9 <br />• 10-ir, 24-Hr Peak Stage 6787.54 <br /> Emergency Spillway: <br /> Type Trapezoidal Channel <br /> Channel Protection Rock riprap 6 Mirafi 600X <br /> geotextlle <br /> Bottom Width a feet <br /> Minimum Depth (w/freeboard) 1.25 feet <br /> Length 40 feet (embankment) <br /> Side Slopes 3:1 <br /> Inlet Elevation 6787.6 <br /> 25-year, 24-hour Peak Stage (estimate) 6789.8 <br />Summary <br />The capacity of Sedimentation Pond 010 Ss attributed partially to the embankment and <br />partially to the pond excavation. Ouring passage of the 10-year, 24-hour storm the <br />spillway does not discharge sediment doxnstream nor is there any flow through the <br />emergency spillway. In addition, the spillway is designed to safely discharge the 25- <br />year, 24-hour storm event. <br />13-3A-9 Revised 08/30/96 <br />