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<br />l!~'>1IrED STATES
<br />LEPAPTh'1f~NT ;:'~F ThE ~NTER1CR
<br />CJEOLOGICAL SU~'iEY
<br />
<br />MAP OF FLOOD-PRONE AREAS
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<br />aw'rag-e, about 1 {'lw.n,;e in IOU that tht' de,,;ignate-d <~r€,lS will he inulhhded in any Yf"::l.r.
<br />Th;s information is imp-ortant to public a,\fen<:lPS ano prtyutt> clti7.:ens CO!H't'rned 'with futur<o.
<br />land rlen'!opl1lt'nLs.
<br />The fle,od-prone areas hhye b('en dl:'lilwated through use of j'(>adUy 3yaiLlble informa-
<br />tion 011 pa",t floods rathN thall fl-om detail(..rj fi€ld sun;eys and inspt'etinns. In gen€raL
<br />tht' deliIJi:'~tE'd :..tf'(~aB (.\rE' for natural conditions and do not take lnto cons,dt><ation the po:-;-
<br />sible t:'ffe~ts of exist;ng or proptHt'o flood control stru('turE'~ except \\'here those eifect,,;
<br />"ly"ld lot" nitfURh'd Fl'){Hl aN'as havt' bt'pl) idl;'ntifit'd for: (ll urban at ea~ ...vhere the up-
<br />sil'pam dralnugt' bR.;.;in t'xc€t',h Z:i Sq.ltHt' miles, (2) rural areas in humid region.:; where tht'
<br />upRtream drainugt' baSin ex('ped;.< 10iJ .sqHan.' miles, (~) rural l:l,t't'a:4- in s\:'rniarid rt'giun~ wht'rt'
<br />the urJ':ltream druin~1.';t. ba~in f",;:ct:'t'd" 2:,)ll square miles, and 141 smallt.r drai1l~ge L<-L,,-in.:.t.
<br />depending Oil topog'fuphy <:l.nd potlmtial nse of the flood plains.
<br />Tht' R~lth CongI'Pf<~, ill Hous~' f)(J';u (lit'nt 4(i,), rc('omnwndtu the prepaxation of flood-proHl'
<br />an'it map" to 3.:-.sjgt iT' fllini>nizing Hood 103S->-'8 by quickly irlentifymg thf' B.rPitS of potf'llU!::d
<br />flood htl.Zan::ls. Mon' d"Lt.ilt'd flood inform~lti(IIJ may b~: n:>qull'ed 10J nt her pUl'pOSf>S S-Ut'h
<br />a,,; structural d,~;:;;g:!lS-, t'f'ollomil.' :.4t1Jdi(>~, or furmuiatlon of land-m~e rt>guLn.ions Such (j8~
<br />t<--\llt:'d information m~i:'" be' outaill,,,rJ fr;Jm th' L.t\. (~eol(igical Sun'ey, ()the.!' Feder'J.! agt>oclt'S.
<br />or State, iO(,11.l, a,1d prlYah~ Rgt'nC't\S
<br />
<br />
<br />
<br />EXPLANATION
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<br />~"
<br />) ,.....<;<:"
<br />''Y~'
<br />/,," S'
<br />;,'L.,
<br /><--(;..-.....
<br />
<br />Flood boundaries w('re estHnatf'd from:
<br />Hegional stage-freqlwn{'y rp!ation".
<br />
<br />.
<br />
<br />
<br />Thi3 wo~k l.a<, p,:,rfor~ec by t~le U S Ceoiog,<.;al SUI"'''' for
<br />dl'ti fune!t-d 0;' the Federa! InS"ranc€ Ad1'1,n,s:ratlnr,
<br />Depar:me"'t of Hc'using and Urban Dey~,loprn'Or>t to MeBt
<br />orn. ,>,or.s of the Na4'on?;< F'::)Od insurdflCe !~ct:)f 1968
<br />
<br />:.;TRASB'~t\G, COLO
<br />
<br />,- r V, :C-:~;: ',:"
<br />
<br />Base by U.S_ Geologica! Sur.ey
<br />1':;5-5
<br />
<br />1974
<br />
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