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<br />INTERl'RE'l'ATICN AJlDUSE OF REPORT DATA <br /> <br />lies in floodplain:J.esignation and la"'d use regulations as set fortnin <br />stste statutes. <br /> <br />Flood Fre~ueneY and Diseh&r~e <br />The 10-, 50-, 100-, snd500-yelU' flood events "ere used "" the flood <br />fre'l.uenciestorthefloodpla.inWl.a1.ysis. Thus, the datn developed in <br />this report will be compatible not only tor regulation pu~osea and a.B. 1041 <br />deaignations, but e.1so for Federal InauranceAdministration flood ins urs.nce <br />rate studies. <br /> <br />The Stllte of Colorado cc>nsi1ers the lOO_yelU' freq""ncy flood as the <br />flccd event to be used in designing ""d protecting structures anc1 d"ellings <br />forhumanoccupllACY. Therefore,s..Ufloodplainregulationsarebssed <br />uPon the 100_year flood. Also, the area which ""uld be inundated by the <br />100_ye"r floodlllo,ybe delineatedasllA sresof S*,ste interest as set fort h <br />inH.B.I041,tbeState'slandusebl11. <br /> <br />Thesevariou.flOOdeventsh"veans""rageoccurrenceofonce1nthe <br /> <br />The 500-year flood event is useful in making the public """"" that <br />flocds larger tl'.an the 100-year floodcM and do occur. 1'he500-yearfloc>d <br />event eMbeus"d torreg-llsting highdsk developments vithin the flOOd <br />pl..insuch"snue1"arpo....erplants,orth..storageorm=ul'actureoftorlc <br />or explosive ~terials. <br /> <br />nwnberot'years"sindicat"'d. The lO_""d50_yesr tlood",v",nts are use- <br />tul for futur", engineering studies Md lsnd use pl""ning purposes relat eli <br />to minor road systems, minor ch""nel improvemeots. the location of parkS <br />Mdreerea.tional fa.cilities, -.griculturallands, 1I1ld"ppurtenant structures. <br />For structures Mduses ot'this typc On the smallertributo.ries and in <br />are".Yh..re the high risk of structural fail..,.., is economically fea"ible <br /> <br />and the hszo.rdto life snli property nonexlstent, the use of the luw.., <br /> <br />frequencyfloodsmo,ybeoonsidered. <br /> <br />The 100-yeflr flcode"",nt Or Intermcdil1te Region.u rloodis d",finedas <br /> <br />l1 flood having an "verage frequency cf occurrenC'" on th", order of once i n <br /> <br />100ye"rs..t a.d",signatedlQcaUon, slthough, the flood can occur in MY <br />year. A 100-yeo.r flcod has a 0"'" percent chance or happening in anyone <br /> <br />ye~r. The 100_yesr flood. e.....,nt "'!l,)I "ISO be used fur e'lg~neering de311;" <br /> <br />p~~ses ...here e 10"er risk of railure than the 10- or 50_year flood is <br /> <br />desired. Hovever, the ..,st important use of tt.e ::'iXl_ye9.~ :'load even~ <br /> <br />" <br /> <br />" <br />