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TABLE 6 <br />• Design Storage Capacity Summary <br />Sediment Pond 004 <br /> Stage Capacity <br />Elevation (feet) (Ac-ft) Description <br />5658. 0.0 0.00 Bottom of Pond <br />5662.0 4.0 0.11 Elevation of Principal <br /> Spillway and 100% <br /> Sediment Storage <br />5665.07 7.07 0.29 10-year, 24-hour Peak <br /> Stage <br />5665.89 7.89 0.34 25-year, 24-hour Peak <br /> Stage <br />5666.0 8.0 0.35 Elevation of Emergency <br /> Spillway <br />5667.42 9.42 0.48 100-year, 24-hour Peak <br /> Stage <br />5668.0 10.0 0.53 Top of Embankment <br />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 nonclogging <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 diameter as <br />much as possible. The stage-discharge relationship of the emergency <br />spillway inlet was calculated using SEDIMOT II, while the <br />stage-discharge relationship of the principal spillway inlet was <br />calculated using the orifice flow equation below: <br />9 <br />