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r . . <br /> �_ � _ _ <br /> T[ME OF CONCENTRATION FOR: <br /> I MERRILL CREEK APARTMENTS <br /> � MERRILL BASIN <br /> PROPOSED CONDITIONS <br /> rSheet ftow: T�= 0.42(n�L)o.e <br /> �px)os�so�o.� <br /> � Wherc: T,: iraveltime(min). <br /> � n,: sheet Fo�v Manning's Effective roughness coefticient(from T,.ble 3.5. <br /> L: low length(ft). <br /> P=: 2-ywr, 24-hour rainfall (in), (see Figure 3.5.1 C). <br /> Cso: slope of hydraulic grade line (land slope, R/R). <br /> (. Channel Flow: T,= L <br /> ` 60k�(s )o.s <br /> 0 <br /> � where: T,: travel time(min). <br /> L: flow length (R). <br /> � Ic�: time of concentration velucity faetor(ft/s), (see Teble 3.5.2C). <br /> s,: slope of hydraulic grade line(land slope, R/R). <br /> � CALCULATIONS: <br /> � Sheet Flow: Segment#= l T,= 6.07818 min. <br /> n,= 0.15 <br /> � L = 95 <br /> change EI. = 14 <br /> P, = 1.55 <br /> � s,= 0.1474 <br /> Exist.Cond. - Page 2 <br /> � Segment#= 2 T,= 2.15292 min. <br /> n�= 0.011 <br /> L= l62 <br /> Ichange EI. = 5 <br /> Pz = 1.55 <br /> � so= 0.0309 <br /> � Pege S <br />