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<br />PEAK FLOWS <br /> <br />TABLE 5 <br />EXISTING BASIN (cfs) <br /> <br />!.ocation <br /> <br />. <br /> <br />Hecurrence Inter-val (yea.s) <br /> <br />lQQ 'iOQ <br /> <br />include the channelization west of college Avenue OInd through <br />stuart und Stover streets. SWMM runs with storOlga/discharge cut.ves <br />for the BNRR culverts for both the optionid detention schem" <br />(presented in sc<.:tion 5) OInct the cxi:>tiny detention wittl tile <br />proposed culverts were run. Peak discharges fOI: the 100- and 500- <br />yeal: event:;; arc decreased under both conditions due to the <br />Bur-lington Northern Railroad embankment no longer breaching during <br />these events. The lesser storm events generate a slight inc.ease <br />in flow due to the channel improvements and resulting increased <br />hydraulic efficiency. These increases are generally less than 5%, <br />and confined to the channel. Hydrology upstream of the Burlington <br />Northe~n Railroad will not be significantly impacted by the <br />improvements. The Taft Hill detention pond, to be designed to <br />simulate the existing detention, may lessen flows due to the <br />requirement that Taft Hill Road not be overtopped. <br /> <br />Confluence <br /> <br />'" <br />m <br />m <br />'"' <br />m <br />no <br />" <br />" <br /> <br />C & S Railroad (Upstream) <br />Lemay Avenue <br />College Avenue <br />BNRR (Upstream) <br />Shields street <br />Drake Road <br />Taft Hill (Downstream) <br />Taft Hill (Upstream) <br /> <br />1~0 <br /> <br />1.Q '-" >.0 <br /> <br />1~60 1550 1800 <br />1170 1450 1"/50 <br />10401270 1510 <br />920 1130 1340 <br />1170 1620 ~ 110 <br />640 840 1050 <br />160 240 380 <br />140 220 360 <br />440 650 390 <br /> <br />PEAK FLOWS <br /> <br />TABLE 6 <br />- DEVELOPED BASIN (cfs) <br /> <br />Recurrence <br /> <br />LocOltion <br /> <br />Confluence <br />C & S Railroad (Upstream) <br />LemOlY Avenue <br />College Avenue <br />BNRR (Upstream) <br />Shields Street <br />Drake Road <br />Taft Hill (Downstream) <br />T..n Hill (lJp"tr.,,,,m) <br /> <br />'60 <br />m <br />m <br />DO <br />,.., <br /> <br />2070 27~8 <br />2070 2790 <br />1710 2760 <br />1560 2120 <br />26302780 <br />12501830 <br />760 1490 <br />760 1490 <br />1150 1740 <br /> <br />Z. 1..Q <br /> <br />Interval (years) <br />~5, '30 100 <br /> <br /><;00 <br /> <br />Hydrographs for the 100-year storm event with recommended <br />improvements in place for various locations downstream of College <br />Ave. arc shown in the TeChnical Addendum. The shorter peakin<) time <br />experienced at the C & S Railroad and the confluence is dlle to <br />local inflows downstream of Lemay Ave. <br /> <br />1430 <br />'" <br />m <br />m <br />1l<j() <br /> <br />1810 <br />1080 <br />'" <br />'" <br />160n <br /> <br />2280 <br /> <br />1560 <br /> <br />l?()? <br />1210 <br />~o,n <br /> <br />880 1520 1840 2140 2560 3260 <br />790 1280 1560 1840 2400 3360 <br />750 1200 1470 1730 2400 3360 <br />795 1100 1380 1640 2400 3360 <br /> <br />3.5 Hydrology with Recommended Improvements <br /> <br />TlIBLE 7 <br />PElIK FLOWS WITH RECOMMENDED CHlINNEL IMPROVEMENTS <br /> <br />Z890 <br />Z080 <br />1740 <br />1680 <br />J490 <br /> <br />Recurrence Interval <br /> <br />(years) <br />1.Qj) <br /> <br />""' <br />3330 <br />2970 <br />J14() <br /> <br />4280 <br />3200 <br />2730 <br />Z'/30 <br /> <br />1-Q <br />1600 <br />1310 <br />]J,Q <br />1130 <br />1430 <br />'" <br />'" <br />.130 <br />11'10 <br /> <br />'-" <br />ZOJO <br />1620 <br /> <br />5Q <br /> <br />LqS;.<!ll.QIl <br />Confluence <br />C ~ S Railroad (Upstream) <br />Lemay Avenue <br />College Avenue <br />BNRR (Upstream) <br />Shields Street <br /> <br />" <br />920 <br />'00 <br /> <br />2350 <br />1910 <br />1740 <br />1650 <br />2280 <br />1560 <br />1262 <br /> <br />2660 <br /> <br />~230 <br />1<j')() <br />1850 <br />2890 <br />2080 <br />1740 <br /> <br />14(,0 <br /> <br />770 <br /> <br />14<j() <br /> <br />no <br />no <br />m <br />140 <br />DO <br />,eo <br /> <br />1395 <br />1840 <br />1080 <br />m <br />'15b <br /> <br />21"0 <br /> <br />1280 <br />3200 <br />11'j() <br />2"130 <br /> <br />Peak discharges wi..h the recommended improvements were <br />determined for all events a:ssuminq (ully dt'veloped beo,;in condit.ion~, <br />and at'e presented in Table '1. 'l'ho SWMM :noel",1 ,"'.:IS ffivdifiec1 to <br />?2 <br /> <br />Drake Road <br />Taft Hill (DOw'nstream) <br />Taft Hill (Upstn.'um) <br /> <br />1210 <br /> <br />16flO <br /> <br />thOU <br /> <br />;!OJ') <br /> <br />249Q <br /> <br />j460 <br /> <br />" <br />