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i <br /> I5.3 Conveyance System Analysis and Design <br /> I The project mnveyance system consists of an 8-inch and 12-inch diameter closed drainage pipe <br /> system that rnnnec[s to a city 18-inch storm sewer pipe in Tower Street. See Appendix A, <br /> Exhibit 2. <br /> I The Rational Method was used to check peak flow capacity and size mnveyana: pipes. <br /> � PrecipiWtion intensity vaiues were taken from the City of Everett Starmwaler/danagement <br /> Manual, Figure 1-5.1 (see Appendix A, Exhibit 8). The maximum values were used for <br /> � conservancy. All dra�nage basins were calc.ulated based on a minimum time of concentration of <br /> 6.3 minutes. The individual pipe runs were calculated by Manning's Equation (basin calculations <br /> and printouts are included below). See Appendix A, Exhibit 5 for Conveyance Basin Map and <br /> � Exhibit 6 for Pipe Conveyance Map. <br /> The pipe system was checked for minimum velaity for the 25-year stortn. All system <br /> components have a design velocity of at least 2 fps for the design stortn. Pipe capaciry was <br /> � analyzed for capacity for the 25-year storm. No backwater analysis was perfomied because all <br /> pipes v lthin the system function below 50 percent depth for the 100-year storm. <br /> 1 <br /> I <br /> � <br /> 1 <br /> � <br /> I <br /> I <br /> I <br /> I Stormwater Site Plan QQ : O <br /> Everett Community College <br /> Fltness Center 6 <br /> ( 208221.10 <br /> iC <br />