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Roadside South Portal Area <br />North Collection Ditch <br />Calculation Rational and Results Summary <br />Rational: <br />Calculated using SEDCADT"" 4 for Windows <br />The North Collection Ditch collects flow from the two terraces on the RSRDA and <br />conveys the flow into pond 8. The ditch segments are Sections O-O' and 01-01' <br />shown of Exhibit 66. These ditches are temporary since they will be replaced by <br />ditch Sections F-F' and G-G' shown on Exhibit 6C. <br />The flow for these temporary ditch segments is developed as follows: <br />CFS <br />1. Flow RSRDA upper terrace, ref. Appendix 14-6, page 14-6-18iv 6.16 <br />2. Flow RSRDA lower terrace, ref. Appendix 14-6, page 14-6-18iv 3.24 <br />3. Flow ADS pipes, ref page appendix 13-2 page RSS-36 2.14 <br />Total Flow into north collection ditch <br />11.54 <br />This peak flow of 11.54 cfs was utilized for both ditch sections modeled even <br />• though the upper ditch section 01-Qi' would not see the entire peak flow <br />because it is above the lower terrace. <br />The size of the channels is presented on the following two pages. <br />See Exhibits 6B, & 26. <br />ENGINEER'S CERTIFICATION <br />The SEDCAD calculationsoa~~~tion presented on pages RSS-51 through RSS- <br />53 were prepared by m~-~a`~ng°ttie~rlsi~th of May 2003, and the information presented <br />is true and correct to tl~~¢f'of my'~q~edge and belief. <br />~ ~~ ;~,• ~ <br />~ ~~,,,,~~yy ~: <br />mes E. Stov~~P.E. Date <br />Rer,~d Profess~~al Engineer <br />Stai'as~'t,~pl°or~?i~'No. 19230 <br />I• <br />RSS-51 (New 5/03) <br />