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<br /> <br />I <br /> <br />I <br /> <br />1 :c' <br /> <br />I <br /> <br />H"d~"aul irs <br />......J........._.....__..__..........~...~. <br /> <br />I <br /> <br />Hydl'-aul ic: ana.lyse'.:- L':lnductpd in this stud',;, \",'e~"e ':JOf!E' us.in::.! U.E;~ A.!'-my <br />COt-!=, (If E:~r!:.:~ i nE'er's c (!l'Ilput~::'t.. modE' j hl=-t.:'-~:::. "!"i:(~ ~jeLet-a I ! and ~,_ j OpE: i fl thE.' <br />stuc!y react) is 8~ea,ter- 'tharl 4 percent, ther-efore su~'ercritical flow <br />corlditjofis ~,r'evai I through alml)~t al! study reacl1es. <br /> <br />I <br /> <br />It was determirled irl a meeting on Jur:e 11~ 1992 that a baCkwater <br />analysis would be used where critical deptil wouid be computed and used <br />in preparing flood elevations for tois study. This was in j ieu of <br />usirl8 a super"critical dr-awdown analysis. <br /> <br />I <br /> <br />I <br /> <br />Disctlarge values wet-e discussed in t~le hydrology section of this <br />t"eport. ~I)st of the cross sectiorl data were d!~itized fyom <br />topogt"ar,t1ic maps with a ~icale O~. 1 inch = 200 ft with 5--ft contour" <br />i ntet"\'a is. H')inE' ~;upp; proenta.l f i f2 I Jj SUru\-,c:ys \,JE':"-e rna.de at :c.pf2C i f j c <br />sites and a number- clf adcijtjonai cross sections needed at road <br />crossings wet"e developed ft"om the toposraphic maps. Dimensions of <br />bt" i d~iE'~-; a.r!d hydt"au lie t"OL.l.8hness coef i c i ents (rl-" \/a lues) v..Jet"e <br />det:E'l'-rninr~d fl'''orf'l field invE:-:::.ti~1~:i.tions alllj fr-orn thF2 I'Dt"3,ioa.:.:3E' lYla.:::.t:et.. <br />Plan fOr" ThE-! Cit..,. (If Cr'ippie (:1'"(,:01<". <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />IAlatet- s.lH"fare pt"(<fl ies, typical Ct"OSS sec:tiorl!~., a.nd roap~. ~~,hol,.,Iin:3 the <br />lOCI-year flc,od bou~darje5 are showrl on included exhibits arid fiood <br />plain roaps. Table:3 shclws computed fioc,d elevations at specific cross <br />~:.E-:ct i on~;. ~ <br /> <br />I <br /> <br />Flc,od tlollGdarieS were located on trle set of tC'~loSi~aphic maps~ <br />p~"eviou.~;.iV ~~efet-t-ed to, by tr';:J.nsfPr-t-i,'18 fiood elevatIons (at rnaJ:' <br />cont:out-. intet-vais) fl'''orn plottpd pr-"ofi Ips (f't"om HCC:-'2) to the ma.p~. <br />usirl8 stationing along tte main c~iannei as the ioea,tioD reference. <br />l'hese pc,ints were connected and smoothed to create the map flood <br />bounda,t" i es ~ <br /> <br />I <br /> <br />I <br /> <br />Chan3P::~ al'-I? being ma.de alm(lst daiiy in Ct-ipple Ct~eek. SomE-:' have an <br />influence (In the wa.tet-~;hed hydt~aul ie cha.t-actet-i'..;tics thet-ef'ot-t? the <br />fel )owinS assum~!tiorls are made pertaining to recent constructions <br />pt-ojects: <br /> <br />I <br /> <br />I <br /> <br />l~ .A. new doutl1E.,-'c:eI i cu!vel'"t. is in place orl Ct-ipple Cj'-eek <br />at F~ourth Street and Meyers Avenue. <br />L. .A. flew pipei ine 5yst-ern is in piace alons SeCOnlj StJ'~eet. <br />between Wat-ren Avenue and Carr Ave11ue which wi j I <br />pSlsentiai ly el iminate the flood plain tht"ougl": that t~ea.ch~ <br />3. A project to dfrect any overffow frclM an existir)8 floodway <br />rlear Golden Avenue and IIBil Street to Pony Gulch is cornplete. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br />