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capacity and erosional stability. The following summary tables indicate a range of slopes and erosion <br />control requirements for each emergency spillway and segment of the temporary and permanent channels. <br />All channels are designed to meet the requirements of Rule 4.05.3 or Rule 4.05.4 as appropriate. Rule <br />4.05.3 is for drainage areas less than one square mile and requires a minimum design event based on the <br />10 year storm. Rule 4.05.4 is for drainages in excess of one square mile and requires a 100 year, 24 hour <br />event. <br />5.0 GRAPffiCAL RESULTS <br />Refer to Exhibit 7, Item 14H for a presentation of riprap size requirements for various trapezoidal <br />channels under a variety of slope conditions and design flows. These results are based on the SEDCAD <br />procedures described herein. <br />6.0 REFERENCES <br />Bureau of Land and Water Conservation, Division of Stormwater Management and Sediment Control <br />(1996). "Erosion and Sediment Pollution Control Program Manual'. Commonwealth of <br />Pennsylvania, Department of Environmental Protection, Office of Water Management. <br />• Harrisburg, PA. <br />Chen, YR., and G.K. Cotton (1988). "Design of Roadside Channels with Flexible Linings". Hydraulic <br />Engineering Circular #15. Federal Highway Administration. McLean, VA. <br />Temple, D.M., KM. Robinson, R.M. Ahring, and AG. Davis (1987). "Stability Design of Grass-Lined <br />Open Channels". Agriculture Handbook Number 667. United States Department of Agriculture, <br />U.S. Government Printing Office, Washington D.C. <br />Warner, R.C., P.J. Schwab, and D.J. Marshall (1998). "SEDCAD 4 for Windows Design Manual and <br />User's Guide". Civil Software Design. <br /> <br />Exh. 7-14-4 Revision Date: 7/25/06 <br />Revision No.: TR-63 <br />