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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 (Elev. 5697.0). The principal spillway inlet is <br /> a 0.5-inch diameter hole located on the riser of the emergency spillway <br /> drop inlet structure (see Exhibit 13-13) and located in a position on <br /> the embankment so as to prevent short-circuiting as much as possible. <br /> The stage-discharge relationship of the emergency spillway inlet (12" <br /> CMP) was calculated using SEDIMOT II , while the stage-discharge <br /> relationship of the principal spillway inlet was calculated using the <br /> orifice flow equation below: <br /> Q = C Ao 2gH <br /> where: <br /> Q = discharge in cfs <br /> C = coefficient of discharge = 0.6 <br /> Ao = cross sectional Area = 0.0014 ft.2 ( .05-inch diameter) <br /> g = gravitational constant = 32.2 ft/sec.2 <br /> H = head (ft. ) = 0 to 5.0 ft. <br /> Elevation H (ft) cfs <br /> 5697.0 0.0 0.0 <br /> 5698.0 1.0 0.007 <br /> 5699.0 2.0 0.009 <br /> 5700.0 3.0 0.011 <br /> 5701.0 4.0 0.013 <br /> 5702.0 5.0 0.015 <br /> Table 7 is a summary of the spillway data. <br /> 10 <br />