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TASK 24 FINAL DRAINAGE CHANNEL CONSTRUCTION 100 YR STORM <br />~'~ H~~'•... <br />r. S,> ... <br />{t~ 23655 <br />Ditch Design <br />Fbw <br />(cfs) Freeboard <br />Capacity <br />(cfs) Length <br />(ft) Sbpe <br />(%) Design Xsec Area/ <br />Design+ Freeboard <br />Xsec Area (fP) Manning's <br />Velocity <br />(~) Ex ve <br />Vol <br />Fs9 <br />' . equir, <br />OVAL E~a~ <br />A 4.4 8.5 100 2% 3.0 / 6.0 2.8 600 e <br />B 10.6 17.3 330 4% 4.017.5 4.3 2475 Fabric <br />C 4.6 5.5 350 1.5% 1.0 / 4.0 3.7 1400 None <br />D 1.5 2.7 770 4% 1.0 / 3.0 2.7 2310 None <br />E - 4.6 5.2 190 14.5% 3.0 / 6.0 5.8 1140 Ri ra <br />F 4.4 6.9 35 42.9% 1.0 / 3.0 6.9 105 Ri ra <br /> Totals CF 1.2Swe11 7 = 297LCY <br />Manning's n for ditches A, B, C, D, = 0.025. Manning's n for dtches E 8 F, (riprap) = 0.050. <br />DITCH SIZING <br />Ditch A Ditch B <br />h----- ~.a -~ ~-,-----~-- B.o --j <br />\ ~ 0.5 1.5 '~? 3.. 1 emu=, 2}~ ~ ~4V <br />I-~~-~ \ / E-zo--r <br />2~-1 SIDE SLOPE <br />Ditch C <br />Ditch D <br />~60~ L--~50~~ <br />?l SIDE SLOPE <br />DITCH E & F DESIGNS WITH RIPRAP <br />0.5 <br />SIDE SLOPE <br />4.75 <br />COST ANALYSIS: <br />Excavate 319LCY with Cat 307C. 1193 Totai time = 3.1 <br />~f. <br /> <br />Using RS Means Site Work for riprap placement Xsectional area for riprap = 4.75 cf/lineal foot of channel. <br />(Channel t: + F) x (Xsecj = 260ft x (4.75fl~ =1,235cf, s 46cy. <br />_._. <br />Machine placed costs = (46cy) x ($27.45) .11283. Rate of placement is 62cy/8hr, 46162 (8hr) = 5.9 hours. <br />Cost of riprap = ($35fton)(1.425tonslcy)(46cy) _ $2294. <br />---,..~....~. ......,,,a,,.. <br />Fitter fabric costs: 90' x 8' roll =$38. 6'staples/roll ®$7. Ditch B (~ 330'/90' x ($45) =1185. Assume 6 hrs installation <br />time. <br />Total costs: $3918 Total Ume: 17 bra <br />