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l:c <br /> CTIME OF CONCENTRATION FOR: <br /> EVERETT SCHOOL DISTRICT BUS FACILITY <br /> CITY OF EVERETT <br /> BYPASS AREA <br /> Shcctllosr T,^ 0.42(n,Lfa <br /> (Pr)os(, )o., ' <br /> Where: T,: trawl time(min) <br /> n,: shat flov,Mannings Effmtise roughness coefficient(from Table 6.1). <br /> 1.: low Ingth(fl). <br /> Pr: 2-year.2h-hour rainfall(in).(sce Table L'.1). <br /> s,: slope of h)droulic grade line(Innd slope,it fl). <br /> Shallow T,- L <br /> Concentrated Flow•. 60k,(%f <br /> where: T,: tmvcl time(min). <br /> 1.: low length(fl). <br /> k,: time of concentration velocity factor(Ns),(sea Table 6.1). <br /> a,: slope of hydraulic grade line(land slope,ft/fl). <br /> Channel Flow: T,- I. <br /> 6oFti(..f <br /> where: T,: trosel time(min). <br /> L: flow length(fl). <br /> k,: time of concentration velocity factor(Ns).(see Table 6.1). <br /> a,: slope of hydraulic grade line(land slope.NIl). <br /> CALCIII.ATION8: <br /> Shat Flow: Segment M^ I T,- 0.6796 min. <br /> n,- 0.15 <br /> I.- R <br /> change FI.e 2 <br /> Pr- 1.55 <br /> $.- 0.25 <br /> Segment 0- 2 T,- 3.93878 min. <br /> n, 0.01 I <br /> 1.- 326 <br /> change EI.- 'r <br /> 1',^ I ?5 <br /> Sea 0.0276 <br /> T,• 4.62 cob. <br /> Page t <br />