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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 />• .~ <br />C = 0.6 (coefficient of discharge) <br />Ao = 0.0055 ft.? (1-inch diameter) <br />g = 32.2 ft/sec.z <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 />5100.0 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 /> <br />Table 3 is a summary of the spillway data. <br />5 <br />