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C TIME OF CONCENTRATION FOR: <br /> EVERETT SCHOOL DISTRICT BUS FACILITY <br /> CITY OF EVERETT <br /> DEVELOPED CONDITIONS <br /> Sheet Flow: T,= 0.42(n,L)°'e <br /> (Fr)o s(a J' <br /> Wiese 'r,: travel time(min). <br /> n,: sheet flow Manning's Effective roughness coefficient(from Table 6.1). <br /> L: low length(ll). <br /> Ps: 2-3ear,24-hour rainfall(in),(sce'rable E.1). <br /> s,: slope of hydraulic grade line((and slope,1110). <br /> Shallow T,= L <br /> Concentrated Flow: 60k,(snf' <br /> where: T,: travel time(min). <br /> L: low length(fl). <br /> k,: time of concentration velocity factor(Ns),(see Table 6.1). <br /> so: slope of hydraulic grade line(land slope,ft/fl). <br /> Channel Flow: T,= I. <br /> 60k,(sn)os <br /> %%here: T,: travel time(min). <br /> I': flow length(11). <br /> k,: time of concentration velocity factor(Ns),(am Table 6.1). <br /> q,: slope of hydraulic grade line(land slope,Wil). <br /> CALCULATIONS: <br /> Shat Flow. Segment#= I T,= 1.75723 min. <br /> n,= 0.011 <br /> 1.= 85 <br /> change El.- 1.2 <br /> Iss= I.55 <br /> an= <br /> 0.0141 <br /> Channel Floe Segment#= 2 T,= 2.25168 min. <br /> 1.= 505 <br /> change FI.= 4 <br /> k,= 42 <br /> so_ 0.0079 <br /> T,• 4.01 min. <br /> Pepe 1 <br />