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<br />The Flaod prollles !:la~ be u~,,<l in are", "her~ ccmtrover8" ilrts~s o,,~, <br /> <br />th" 100-yea, fload oounda,y shoom em the Flood"d A.rea plilte". Sln~e the <br /> <br />I <br />I <br />, <br />I <br />I <br /> <br />pos.ible f1ood".a)' '"'Hh c"~r<'il<:hm"nt rl11<e' ,,~s "naty~ed 10 this stud)'. This <br /> <br />,",,,s sil!lply " h)'d'''"lIc analysis in ,",hi~" the fla"d plain ""~ thearetf~"lly <br /> <br />Flaod Pr"Hl" plates gi"e tlle ,""Upr gurfll.C.e "levation "-t " sreclfi~ point On <br /> <br />~odlfied to cant~in floodin~ "ithin s"l~~ted e~cron~hment houndarI~A. The <br /> <br />the ref"rence lin", th" hl1{h ",~t"r elevations can he surveyed on the >:rouod <br /> <br />resultin~ ~ffects On flood ~Ievatia~s are shawn in an Appendix separate from <br /> <br />to aUeViate <lOll' dh~<ep,"'cles on the b..~~ map. A a"",ber nf reference moOu- <br /> <br />this report. <br /> <br />"'eots On the same dat= as the base maps ar~ tn pla~,> alooi: eaQh study react <br /> <br />Hydrolo!!:y <br /> <br />and can he used for this purpose. The elevation, ftel<'! l<'!entHication, <br /> <br />Peak dischar~c-frequen~y <lata used 1n this study _re develo!><,d from <br /> <br />lo<:aU"n and descrtpUon af these mon"men~s are described in Table 2. <br /> <br />rei'(re",lonequations1n the publication "Ra1nfall-RunoffModeltlljl;a ndPrel1- <br /> <br />C. 1'l0odedAreas <br /> <br />mlnary Regional Flood Characteristics of Small Rural Watersheds ln the <br /> <br />The floaded Area "'~ps, plates I throup:h q. sho,", th~ bou.ndary of the <br /> <br />A.rkansas Rtv..r Bastn in Colorado, 1981". This Is information developed by <br /> <br />lOO-yearandSOO-yearfto"dplains. Thefloo<!plainboundar:te8wereplotted <br /> <br />the U.S. Geolo~teal Surve)' to cooperation wIth the Colorado Department of <br /> <br />fram the flood proftles hy determining the channel stattonio!: of floo<! cen- <br /> <br />Hi~hways and Federal Hi>:hway Administrstion. The regr~ssion equations used <br /> <br />tours at the S"",e Interval a"the to[>ograph1cmaps. Floodeontours,lIholln <br /> <br />I <br />! <br /> <br />are: <br />Ow '00 '0 ."' <br />- <br />025 - ",0 Ae.97 <br />Q" I, 140 A~ LOl <br />- <br />0\00 . '"~ ",,1.07 <br />, <,))V <br /> <br />as wti'(i'(ly lInes, extend I>"-rpendleull1r to the ,Ureetton of no,", and intenect <br /> <br />the ~round at the ed;;e of the floo<1.platn. <br /> <br />The "r..a~ Indwi"rl "Hhin th~ f1"od line houndari.." ~r.. ~hout 700 ,,~rc~ <br /> <br />!orthe IOCl-yearfrequency""d7SSac""s [ut.th,,:;OO-year. <br /> <br />Upon official approval of thts report by the Co10ra<1.0 Water <br /> <br />0S00 - Based en Ext~naion of Fre~ueney LIne <br />(A.. - Conttibuttng Drainage ~ea - Sq. ~i.) <br /> <br />COMervatiotlllo,Hd, the area outlined by the 100-y.."r fl"od boundary may he <br /> <br />regulated 8~cordlngly by the local offiCials. <br /> <br />Thin procedure establhhed the. lower sej{T1l..nt of a cur"e relating drdo- <br /> <br />D. Flaod"ay <br /> <br />a~e at"a ~a peak d1sehar~... Th.. "!>per part of th" curve Is an extension ef <br /> <br />E.ncraach..ents On flood pldn~, ~\leh ~~ "Htftdal HII, ~"n red"".. the <br /> <br />the lOl<er "">:....ot at a .lope paullel to a ane developed ftOlll "Manua.! for <br /> <br />are"l extent of a flood plain tf provlaton~ are mad~ for Increased flood <br /> <br />P."timatinr, Flo"d Characteristics of Natursl-Flol< Stream" in Calorado _ <br /> <br />heights. As an alt"roattve ta the pr"."ot nooding sttllatior. 1n 1,imon, ~ <br /> <br />Technical ManU>ll No. 1'". <br /> <br />" <br /> <br />" <br />