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VI-6 VI-7 flood~lain ar~ fldrticularly hdHrdous lleCduse they flodt and can b~ carried d.Way oy strong curr~nts. If tney become lodged under a bridge, dam or otner chann~1 r~struction, they Cd.n cau,~ greater a~~th, of flooding upstream. g. U~stream of Mclntyf.o Str~et tne 1iJO-year flow ca~ ov.;rtofl tne right (south) !lank and inu~oate a lar~e ar~a. The on Iy apflarent damage her~ would be the jJossi!lle tem~or<lry cutoft of tne Coors Industries r<l i lroad linebyshdllowfJooding. Reach 2 (Tucker GulCh to McIntyre Street) Reach 3 (McIntyre Street to Youngfield Street) 6. Backwater from the auto and fledestri<ln bridge~ in the Adolph Coors In- dustries ar...a en db les tne iJO-ye<lr flow to breach the bank, of th~ chan- n.:1, cr.:dting overbank flooding which affects several buildings in tne Coors Complex. This overo<lni<. flow inundates tno: Coors greenhouse <lnd re~ siaenceandr...turnstotnechd.nnel upstream of the Colord.do ilod Southern Rai lroad bridge. Th~re are tWtJ aeri al jJiflel in.o crossinys upstrt:!am of the bridge wnich WtJuld likely be sever~d Dy high velocity flood flows. 10. Oownstream of I1:Intyre Street the D<lCKwat.:r efft!ct at tne rai Iroad bridy~ crt!dtes a rise in tnt! lOa-year watt!r surface such that overflow can occur over th<, soutM bank anOWtJuld likely occur over the north banK. Overflow to the south would inund<lte a large gravel pit ano flools would return to the channel aownstre<lm. OverflownorthwardwouldCaUS"floodingoftne Coors Industries rrans1oadbuilding. The Farmers Kighline Canal conduit may De surCnar!led by tnis overb<lnK flooding,cd.usingflows in excess of the canal's callacityto be released at the downstream end of the conduit. Overflowortnecallal wouldciluse flooding of Lne sewage trt!atment plant and coner"tt! batch plilnt. n. Hi im~ortant r<lW water supply cross ing exists at this loction. A 54-inch concrete pipeline aM a 42-inch concrete pilleline carry water to the Moffat Filtr<ltion Plant from Ralston Rest:!rvoir. The Oenver ~at~r Devart- mentmaintains tnesepillelines, witHin anSD-foot right-of-w<lY. At the locat ion wh~r~ tnes" pipel ines cross the ch<lnnt:!l tMer" is scour protec- tion in tne form of dumpell concrete rubble. However, this type of milter- lalcanoeunstableolhen,ubject"dtonignvelocityflows. 7. Oownstream of the C&S ~a ilroild 6rid!!e, the lOO_year flool is conte ined witninthech<lnnel witn the "xceptior. of one area adJacent to the Coors containerouilding. Overflow Ciln occur along tne soutn, or right tlank in this area. Tn.;re is <llso an aerial gas main crossing in tl1is<lreawhicn coulo 0<' severed oy th" hiyh velocity channel flow. ANALYSIS OF BR1GG~S AT FORO STREET A~D ~ASHINGrON AVENUE 8. In tnis art:!a there is a dam whicl, controh the creek \/later surfae" for o i'''er~ions to the Rcc~y !'IJuntain Oi tCIl anll the CroKe Canal. Ouring the lOO_ye<lr flood tne Croke C<lnal ~ivers lon works WtJU 10 b~ overtoppeo and the overflows would follow tMeCanal eastward to a point where it enters a con~u it b~neath Co lor adO 58. flow i n e~ce~s of the can a I' S capac ity would sp1l1 out of tnecanal <lndreJoin tht:!channel flow. Oamage in this areawouldb" li:!lit,;o to possicle wasnout or scou" effects on the canal banks due to the exce,s flow~. Ford Street and \Oashi ngton Avenue are maJ or a~tt!r ia 1 roads and importdnt north_south transportation lWKS. Tht:! loss of eitner or botM bridges would navt:! a serious impact on transportation. emergency services, and utilityser- vice.. such d, "dtur~1 9a, Md water supplf. Oue to their importance, analy- seswereconducted tooetermint:! the stal>ilityof each bridge structure witn respect to scour forces, imp<lct forces and u~l;it forces.