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N <br /> <br />i <br />I <br />i <br />I <br />I <br />I <br />I <br />I <br />I <br />, <br />I <br />I <br />I <br />I <br />i <br />I <br />I <br /> <br />nibut<<r1es, and in areas where the high riak of st.ru:c.tural failure is econo.mically <br />{..asibl.. and the hazard to life nnd p-rope-r:y none'l<istent, the u~e of the lower fre_ <br />~"ency .floods """y be considered. The 100-yea:r even:, 'also te"("llled the lntermed1Bte <br />Regional Flood, is defined as a flood having an average fre~uency af .oecurr~nce on <br />th~ order of onc~ in 100 years at .a degignate~ loc~tion, alth~ugh the flood can <br />occur in any year. A laO_year flood has a I_p"rcent ch""","of happening in ,any one <br />year. The lOO-year flood even;t ma-y also be used for engineering <l."S.ig-n pur poses <br />where a lo~~r risk of failure t~~n .thc 10_ or 50_year flood is ,desired.. However, <br />thelllOst important use of the lOO-year flocd event lies In.f1ood plain de-signat.ion <br />andland"sereg"lations>ls-set fo.rt'h1;l.state statutes. TheStaeeof'Colorado <br />conside.rs the lOa_year frequency -flood 'HI.the flood -even.t to be used in desJ..gnir\g <br />and protecting 'Structures and dwellings for human occupation. Therefore, all flnod <br />plalnregula:tion.. are based.upon the 100-.yaar nood. Al'Sc" the are...'whlchvtluld:be <br />inundated by the lOo--year flood ~ay be delineated .as an atea of state interest .~s <br />setforJ:hinH.B.1041,thc5t;l'te'sland,usebl11. <br /> <br />The 500_y~"r flood even.t ,is useful in making :he :pClbJ.ic alo'&l'e .thar 'floods lar~'er <br />than tIlt! lOll-year fLood ca" and da occur, The 500_yenr flood ",,"nt can be "","d for <br />regulating'hlgh risk devclop:ncnts ",ithin:t'h-e n,,-o'd.ph:in, such "-"ouc!"'ar power <br />planes or.th<: stora~e,or m'lnuf..ccure .01 CO.-xic or.explosive _tero.al-5.. <br /> <br />T<illle 2 List.'" the discharges and water surface -el.."..t.:!.Ol'lS fll:r .the 10-, 50-, <br />100_. and 500~"e"r flood events at selecned rclerenCl! -!,o1n:t~. <br /> <br />Flooded Areas <br /> <br />Tht1 100_ye"r fr~:quency [100<1 has b.."" ..elected by the State O'f Co.lo-rada- "" lthe <br />fl.ood event to b~ "sed for flood pLain de-ltn~"tion and :reguJ.lltio'n.. In ..ddit'iun to <br />the IOO_year flood plain Jelineut1nn, the Flooded ilr"" ~l..teb altio snow ~he 5DO-seaT <br />flood deli_atton. Since the base ""'I' f<&r.th~ Flooded II""",,, Pl"tes 'in.thls "'p"r't <br />utili"eh 2_foo.t nrul5_foot con.ou," ",,,pptng, .the out1ines<rf the 10_""<lS0-y>>u <br />flv<Jd ev<me.. can he'''''-adily plotced using the information in Tah1.. 2. <br /> <br />l'h~ area a"lbeated on the nooced A-r..a ~late" OS the lOO-year flood "la1.~ 'mee1:s <br />the ri!~ire"",nt" of !i.ll. l.O~l as 0" area of stute ir.terest, '\:50, "ron official <br />approval of this report by the Colorado Water Conservation Board, the area outlined <br /> <br />" <br />