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SPILLWAY <br /> Sediment Pond 005 provides for a combination of principal-emergency <br /> spillway to safely discharge the runoff from a 25-year, 24-hour storm. <br /> The principal spillway inlet will also be used as the non-clogging <br /> dewatering device and is located at an elevation higher than the maximum <br /> sediment storage volume. The principal spillway inlet is located in a <br /> position on the embankment so as to prevent short-circuiting as much as <br /> possible. The stage-discharge relationship of the emergency spillway <br /> inlet was calculated using SEDIMOT II, while the stage-discharge <br /> relationship of the principal spillway inlet was calculated using the <br /> orifice flow equation. <br /> Q = C Ao 2gH <br /> where: <br /> C = 0.6 (coefficient of discharge) <br /> Ao = 0.0055 ft.2 (1-inch diameter) <br /> g = 32.2 ft/sec.2 <br /> H = 0 to 9.1 ft. (above the opening) <br /> Elevation H ft (cfs <br /> 5694.1 0.0 0 <br /> 5696.0 1.9 0.04 <br /> 5698.0 3.9 0.05 <br /> 5700.0 5.9 0.06 <br /> 5700.9 6.8 0.07 <br /> 5702.0 7.9 0.07 <br /> 5703.2 9.1 0.08 <br /> Table 3 is a summary of the spillway data. <br /> 5 <br />