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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 (.OS-inch diameter) <br />g = gravitational constant = 32.2 ft/sec.z <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 />