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<br />Uno" r"vie" ~,,~ ~"pro~il.l ot this report, the Col~r3do \'''-ter !;onaerva.-
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<br />rio" 8o!<rd Io'ill destg""te and I1pprove as nood pL'lin areas thoae areas
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<br />inundated hy the lOO~ycar flood a5 rl~scribed by the floodwater ~urface
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<br />elev~tions atld proflle" In this tepon. 'rl\{, \I~~ of th<> d<!8tllnated flo()rl
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<br />pl,dn areas ",ay then 00 re15ulAt~d hy the 10cll.! ~overnm'!nt.
<br />
<br />Modd Rep;ulatio<lS
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<br />In the model flood pl~in reilulations, adopted by the Colorado WatE~
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<br />ConservaUonBo"I"t1, the statement of purpose h topro1"!l<"Jtc the. public
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<br />health, safe~y, and Il:cnc,al welf"r~, ~nd mlnimhe flood ha.ards an.d losses
<br />
<br />by prov1sions designed to:
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<br />1. PrQraote sound plannlnp; "nd land u~e, ""d permit only SUCh uses within
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<br />floodpl~ln8 that will be endauller life, health, and public safety Or
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<br />prope~ty in times of floodin~.
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<br />2.
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<br />P~otect the public from ,woldable Unandal expenditu~e" fo~ flood
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<br />con~~ol p~ojects, flood ~elief meaaures, and the ~epalr and ~estoration
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<br />of dallla)!:d public facilities.
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<br />;.
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<br />P~event avoidable inte~ruption of business and commerce;
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<br /><,.
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<br />~lnimize victimization of unwary home and land purchasers; and
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<br />,.
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<br />Facilitate the administration of flood hazard a~eas by establishing
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<br />requirements thntmust be met before use or rl,'veloprnent lspermltted.
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<br />,h<.>lloard'srnodel floodpLain rellulations offer tW<l optiona for
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<br />management of the lOO-yca~ flood plain. Tltese are the Ilazard !"rea Concept
<br />
<br />"od the Ploodway Co"cept.
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<br />The lIaz"rd Area concept defines the "~ea of the flood pLdn in whieh
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<br />W1lt,,~s of th" Inn-year flond attain a maxim".. <lerth r,re3t"~ t!l.nn 0""- and
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<br />o"e-half feet .~s a hlv,h h"~ard area, and a derth less than this ,1~ .1 1"101
<br />
<br />ha~"rd .1re.,.
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<br />"
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<br />The I!oa~d ree"",,"ends that no l),;,seme"ts should he ..,111\\.1<'11 f,,~ .tr<,au~e.
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<br />located "'I thin th" low hazard .1<ea and all. h"hita~le Itv1ng quarten (Hrat
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<br />flno~s) shoCtld be constrCtcted a minimum of one foot aho'l" the IOn-'fea~ flOod
<br />
<br />water surface ele"ations. ""velnpmon~ is prohihited in ht~h ha~"rd aeeRS.
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<br />The Floodway c"ncept defioes the channel of " "tream and adlacent flood
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<br />rl~ln areas that must be kept froc af development In o~der to safcly pass
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<br />the lOO-yedr finod.
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<br />Therearesever1l1methodsusedinf!00dwa'fco",putations. rmesnch
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<br />theoretical method is computed on the baSis of equal conveyanee reduction
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<br />for naeh Bide Qf the flood plain. Although a detailed rate study could not
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<br />be made for the area included in this repo~t, ~ theoretical floodway ~"s
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<br />compur J for future ref"rence. neeause of the l,,~~e amount of eomnutational
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<br />data. floodwsy informatIon is lncluded in App.",d1x n separate to this
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<br />report. Data 'Ire In tabular fo~m "nd in,,-llIde floodway widths, "-rosa SeC-
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<br />tlonal flow ar~", and avera~e valoclt1es. Computations ~re fo~ a" inerease
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<br />in rise of w"te~ aurEaee elev~Uons in O.S' increments Ern", 0.0' to 1.5'
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<br />~b()ve th~ lOO-yea~ flood.
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<br />Flon<1 l"''''r''n~''
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<br />The )/"tlona\ Flood lnsur"n~e IIct of 1968 (Title XIll of th" 11olla1n~ and
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<br />Urbnn DeveloP"lent Act, P.L. 9D-4411) reeo~ntzed the neeesslty fo'r flo,-"j
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<br />plain ""'na.~em"nt. 1'nis,>,ct make8 fe<l"~ally .ub_.ldi~~d insuran~" av.,Uable
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<br />to cith~ns in ~o",""lnltles that 3dopt r~l;ulat1on" ~ontrdlin~ Eutu~e Jeve-
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<br />!op"'~"te of thci~ flood P~"~Il, rIl r.e3,,~ct t.., "-'.'''[Vd~;,"L~"t u" lh~ flood
<br />
<br />plain. the ~e~ulat1ons ~equir,,:
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<br />~e" reald~ntial construct inn o~ substanUal iroprove"",nt of "xi. tin;!;
<br />homes ~"t h~ve the lowest EloQ~ level a~ovp the ~le"~tlon of tho l~~-yeR~
<br />flood.
<br />
<br />N~,,-r~s1de"tlal "onst..,,:t1on Ill<\H "'N't the 3R"'~ stalld,,~d or h.-. flood
<br />proofed t"that le'I"I.
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