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S~illway Design <br />• <br />The emergency spillway was designed using Manning's Equation for Open <br />Channel Flow. The results are shown on the Sedimentation Pond No.5 Design <br />Map, (Map 24J. The spillway was designed to safely pass the runoff from <br />the 25-year, 24-hour event. In addition, to outflow from Pond 5, runoff <br />from the GEC Access Road will discharge to the lower portion of the <br />emergency spillway. The total runoff for the emergency spillway was <br />determined as follows: <br />Q = Pond 5, 25-year, 24-hour event + GEC Access Road, 25-year, 24-hour <br />event <br />Q = 44.74 cfs + 2.30 cfs <br />= 47.04 cfs <br />Inputs for the GEC Access Road are shown on the SEDCAD computer printouts <br />at the end of this section. <br /> <br />C~ <br />81 R Revised - December, 1991 <br />