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Peabody does not anticipate any pit pumpage or other inflow to the pond <br /> at this time. <br /> SPILLWAY <br /> Sediment Pond 004 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 = CAo 2gH <br /> where: <br /> C = 0.6 (coefficient of discharge) <br /> Ao = 0.0021 ft.2 (5/8 inch diameter) <br /> g = 32.2 ft/sec. 2 <br /> H = 0 to 6.8 ft. (above the opening) <br /> Elevation H (ft. ) Q cfs <br /> 5661.3 0.0 0 <br /> 5662.0 0.7 0.008 <br /> 5664.0 2.7 0.017 <br /> 5665.2 3.9 0.020 <br /> 5666.0 4.7 0.022 <br /> 5668.1 6.8 0.026 <br /> Table 3 is a summary of the spillway data. <br /> 5 <br />