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<br />I
<br />
<br />Uno" r"vie" ~,,~ ~"pro~il.l ot this report, the Col~r3do \'''-ter !;onaerva.-
<br />
<br />rio" 8o!<rd Io'ill destg""te and I1pprove as nood pL'lin areas thoae areas
<br />
<br />inundated hy the lOO~ycar flood a5 rl~scribed by the floodwater ~urface
<br />
<br />elev~tions atld proflle" In this tepon. 'rl\{, \I~~ of th<> d<!8tllnated flo()rl
<br />
<br />pl,dn areas ",ay then 00 re15ulAt~d hy the 10cll.! ~overnm'!nt.
<br />
<br />Modd Rep;ulatio<lS
<br />
<br />In the model flood pl~in reilulations, adopted by the Colorado WatE~
<br />
<br />ConservaUonBo"I"t1, the statement of purpose h topro1"!l<"Jtc the. public
<br />
<br />health, safe~y, and Il:cnc,al welf"r~, ~nd mlnimhe flood ha.ards an.d losses
<br />
<br />by prov1sions designed to:
<br />
<br />1. PrQraote sound plannlnp; "nd land u~e, ""d permit only SUCh uses within
<br />
<br />floodpl~ln8 that will be endauller life, health, and public safety Or
<br />
<br />property in times of floodin~.
<br />
<br />2,
<br />
<br />Protect the public from ,woldable Unandal expenditures for flood
<br />
<br />con~ral projetts, flood relief measures, and the repair and restoration
<br />
<br />of dallla)!:d public facllitles.
<br />
<br />;,
<br />
<br />Prevent avoidable interruption of business and commerce;
<br />
<br />'"
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<br />~lnimize victimization of unwary home and land purchasers; and
<br />
<br />,.
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<br />Facilitate the administration of flood hazard areas by establishing
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<br />requirements thntmust be met before use or rl,'veloprnent lspermltted.
<br />
<br />,h<.>lloard'smodel floodpLain rellulationsoffettl.r<;loptionafor
<br />
<br />managem"nt of the loo-year flood plain. TIt"se are the Ilazard "'rea Concept
<br />
<br />"od the Ploodway Concept.
<br />
<br />The lIaz"rd Area concept defines the "rea of the flood pLdn in whieh
<br />
<br />watersofthelnO-yearflondatt"inam"dm"mrlerthr,rearert!l.ano",,-"nd
<br />
<br />o",,-half teet .~~ " hlr;h h"~ard area. and A d"rtll le"s th1ln this ,1~ .1 l{)w
<br />
<br />ha~"rd sre.,.
<br />
<br />"
<br />
<br />The Iloard reco",,"ends that no baseme"ts should"" ..,111\\.1<'11 for stn,aur..s
<br />
<br />located ",it!]'in the low hazard ,;rea and all. h"hita~le Itving quarten (Hrst
<br />
<br />floors) shoCtld be constructed a minlrnum of one footaho'le the lOn-year flood
<br />
<br />water surfaee ele""tions. ""velopmen~ is prohihited in ht~h ha~ard ar""".
<br />
<br />The Floodway c{)ncept defines th~ channel of " "tream and adlac~nt f10nd
<br />
<br />rlain areas that must be kept frec of development in order to safcly pass
<br />
<br />the lOa-year flood.
<br />
<br />Therearesever1l1methodsusedinfloodwaycol!lputations. rmesnch
<br />
<br />theoretical method is computed on the baSis of equal convey a""" reduction
<br />
<br />for e.."h side of the flood plain. Althour,h a detailed rate study eould not
<br />
<br />be made for the area ineluded in this report, a theoretical floodway ~as
<br />
<br />compur J for future reference. necause of the lar~e amount nf computational
<br />
<br />data, floodwsy informstlon is included in App.",dix n separate to this
<br />
<br />report. Data 'Ire In tabular form "nd inclllde floodway widths, cross SeC-
<br />
<br />ttonal flow ar"". and avera~" velOCities. ComputAtinnA Ar" for an increase
<br />
<br />In rise of water surfa"e elevAtions inO.S' incrementsfr""O.O' tol.S'
<br />
<br />above the lOO-yearflood.
<br />
<br />Floo;\ l"'uran~"
<br />
<br />The lI"tional Flood lnsuran~e IIct of 1968 (Title XIn of th" 11olls1n~ and
<br />
<br />Urbnn DeveloP"lent Act, P.L. 90-4411) reco~ntzed the M~es~lty for flo.-..j
<br />
<br />plain ""'na.~em"nr. 'rhls,>,ct makes fe<ler"lly "ub_.idl~ed insuran~" aV.111able
<br />
<br />to etthens in ~o",""lnlties that 3dopt regulation. contrdlin~ future Jeve-
<br />
<br />10p"'''''t$ of their flood p~"~Il. rIl re3"~ct t.., "-'.'C[Vd~;,"L~"t u" lhe flood
<br />
<br />plain, the re~ulatlons r"quir",
<br />
<br />~e" residential construction or substantial i",p[o"e""'~t of "xi. Un;!;
<br />homes ~"t have the lowest floor level a~ovp the ~le"~tlon of the l~~-year
<br />flnod.
<br />
<br />Non-residential o"n~tn,,:tion Ill<\H "'N't the 3a"'~ stand"rd or ho-. flood
<br />proofed t"that le',,,I.
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<br />21
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