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<br />INTERPRETATIONANOCSEOfREPORTOATA
<br />
<br />IOO_YearFloodEvent_
<br />
<br />These various flood event"havl' an ''lV"rage ocC.urrencl' of Once in tI,l'
<br />
<br />Th~ 100_y~ar flood event m..y also b~ used for en!,ineHLng de"L~n pur_
<br />I>"s~s "here a lower riak f>f failure than the to- or 50_ year flood to; d",irnd.
<br />However, the most impoctcmt Ilse of the 100_y~~r f1uad eVent lie" in flo"d_
<br />plaLn d"sign"tion and land use regulation <'Os aet focth in the state st8tute".
<br />The State of Colorado conaidero the lOO_year frequency flood as th~ flood
<br />event to be u~ed In de"1l\nlng and protecting structures and d"ellLn8~ for
<br />humanoccupaUon. Therefore, all f100dplain regulatlo03 Rre based upon the
<br />LOO_year flood. Also, the ac~a whi~h "'olItd lle inundated by the lOO_y~ar flood
<br />may b~ ddineat"d as an area of st"te [ntoerest <IS aet forth in H.B. 1041
<br />,he state's land use bill.
<br />
<br />Flood frcqu~ncy and Di'chac~c
<br />The 10_, 50_, 100_, and 500_ye"r flood event~ were us,.d as the flood
<br />frequencies for thi5 floodplain analysis. Thus the data developed in this
<br />report "ill be compatibl~ not ooly for r~l\u1ation puqlOaes, and H.B. 1041
<br />designations but also fo~ fede<a1 Insurance Adrninistrstioo flood Insurance
<br />rate studies,
<br />
<br />numberofyeacsa'indi<.:at"d. For example, th"lOO_yearfloodoecurs,on
<br />the average, Once in a 100 year period, and hAS a One pe<cent chAnce at
<br />being equaled or exceeded in any I\lven ye<lr,
<br />
<br />'j()O.Yearf'lo<>dtvent_
<br />
<br />The particular uses for the various flood events in addition to t~'se
<br />stated above a<e as fall"",":
<br />
<br />The 500_y,,,,r flood ~"ent is useful In makin~ the I'ubli.c a",are th"t
<br />
<br />(1oods l..rg"r than ,I,e lOO-ye"r O,,,,J can and du "ecur.
<br />
<br />Just lJ<,eall"C
<br />
<br />i>~()r>le may be livb~ ab()v~ the IOO-yea< flood l>ound"ry doe~ not :o,,'"l t~..,t
<br />
<br />lO-Y~.r ~nd 'iO_Y~n< "'ood f."~nts
<br />
<br />Il\r"rm~l;'Ul\ '''~d,J.itl~ Ll","" ~<.,,,<l,,, [HqU~"C~ [l"uJ~ ;., "~,,~~l,,l.y
<br />
<br />l'ley a..., complddy sdi., [r"m i1",)JlrL~. The SC{J_y"a,' [L,)()d cv"nt ~,," also
<br />!>c u",,,i for rnl\ul~ting hil\~l cbk d"",dop'"enls withln th~ floodplalLl" ~uch
<br />"~ nHob'<l< pow,_r I'lanln, <>c Llll' "t()ra~" or munllfac(ur" of t"xL~ 0[. ~xpl()_
<br />
<br />u~eful for future engloe~rlng studies and land Ll"e p1aoning purpo"~s [e.
<br />
<br />Lot~d to minor nl~<! .yst"m., minor d'ann~l l"'p'<lvemcnt., tho lllc>>t!'>!1 f>f
<br />
<br />slve mnHc].'!~.
<br />
<br />park. 2nd recreatconal fadlltles, agricuLtur..llands "nd appu<t~nant
<br />
<br />~tr Lctur~".
<br />
<br />for .tructur~" >,-nd ~"~.. ,jf this tY[i~ ,><, th" "lTI"lIer trihu_
<br />
<br />fable 4 Ihl" th~ discharge< and ""lcr surf a"" ~ I~v"(l,,n" tor the
<br />
<br />Ld"'" ~uJ [" "'~~~ ~;'~'e li,e ld.Sil ,l~" "f eLcueLlIral ""llme L, ee""om,_
<br />
<br />10.. 'iO_. lOG_. ..~d ,OO_V,..lC flllod ,'.-0:\(' ,~l ""I~ct~J rd~r~<>c~ pobts.
<br />
<br />cally i~a"lble and the hazard (0 !If,' and p<OpHty n()n,'d"l~nt. th" US" of
<br />thc lo,",er freq"e"q flo"u, moy b" <considered.
<br />
<br />F!""J"d",-,.,;(s
<br />
<br />'l'h~ lOlJ-ycnr f'r<cqu"t.~y j lu"u I"" :'Oell so lecled by tilL' Stal~ UL Cul"cado
<br />
<br />ns (h,' 11.,,)(1 ,_'v"", t.<' 10.., ',1,c'd 'oc ,I""dI'I"in del 11teo' i"et In,! r"",ul..,tl,,<>,
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