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<br />HJVESTlGATH1'{S A."r> ANAlYSIS
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<br />lOO-Year Flood Event
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<br />Interpretation and Use uf Report
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<br />The iOQ-Year flood eVen~ may also be used fur on"ineeri<<< desl!l"
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<br />,.
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<br />Fr..~u"ncy and Dhcharlle
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<br />purposes where a luwer risk of failure than the 10- or 50-year flood is
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<br />'"c ,,, '" ,"A ,'....n_v"ar ",,'>d events aU used as the floud
<br />",e -'''-, ,,..., ""'-, an vu,~ -"
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<br />desired. Howeve.r,the",osti"'portantuaeofth"IOo-yearfl<l,xleventlles
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<br />frequencies for this flood plain analysis. Thus the data develuped in this
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<br />in fluo~ plain "",na>(..",,,nt and land uSe olannin>( as set forth in the state
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<br />r"port will he compatible not "nly for re!'tutationpurposes, andfl .B.1041
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<br />statut..s. The State of Colorado considers the loo-year frequency flood as
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<br />designation but also for pederal Insurance Ad~inistration flood insurance
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<br />the flood event to be used io deail(nin~ and protectin~ structures and
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<br />rate studies.
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<br />dwellings for humsn occupation. Therefore, all flood plsin regulations are
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<br />Thesev!lri",..sflouJeventshaveanaveral(eoccurrenceofonceinthe
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<br />haseduponthe IOCl-year flood.
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<br />number of yests as indicated. For example, the laO-year flood occurs, on
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<br />500-Year Flood Event
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<br />the average, onc.. ina 100 year pet!od, and has "cmeperc"nt chance of
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<br />The 500-year flood event ia u""ful in making the p\lbl1c aware that
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<br />being equaled or ,,~ccedcd in any ",iven year,
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<br />floods l"-rger than the 100-year flood ean and do oecur. Just hecau"" "
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<br />The patticular llses for the various fLoudeventsinadd1tiontuthos e
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<br />person is 1iv1n>( above the 100-year flood boundary does not mean that he is
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<br />stated above are as followa:
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<br />completely sde fro", flooding. The SOCl-year flood ev"nt can also he used
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<br />lO-Year and 50-Year Flood Events
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<br />for reg\llating high risk developments within the flood plain such as nuclear
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<br />Information r~g.rdlng tbes" luwer frequency floods is especially useful
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<br />puwer plants. or the stora.o:e "r manufacture of to~ic or explosive
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<br />for f\ltureen>(inceri.n>(st",lie6a"d land uS"olannlo>l:purpe>scs rela redte>
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<br />[IIatertals.
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<br />..Inor road
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<br />svste~s minor channel improvements, the location
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<br />ufr"rband
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<br />,.
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<br />Flood Elevat10n
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<br />~c"re"~i()n,,l hcil!~lcs, a>(ric'"ltural lS""5, ..,~ ~rp"rtPM", "t~"c.t"res.
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<br />The exhibits and tables displ"y s~udy reault. by stre~m reach, as shown
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<br />For struetures and uses of this type on the stllaller tributaries or in ,or,,,..
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<br />on the inde" map. flood crest el"vations tot the 10-, 50-, 100-, ~nd
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<br />where the hi>(h risk of structural fallure Is economicnlly fcaslble, and the
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<br />.s()()-ye~r floods ,,~ d<:>tenrdned at each cros~ ~"ctlon "'ay he found in the
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<br />h"-,,"-td of life and property nonexistent, th~ ,,"e <>f the lower freq\lency
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<br />Fluod Freq\lency-Elevation and Dlachar>(e Dat8 table, Table 1. The Cross
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<br />noodsmaybeconsir\er"<I.
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<br />~ection Exhibits, B-1 thro\l>(h B-9, show a >(r~phic~l repr",s<>ntatto" "f the
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<br />high water elevations ~t typical valley ~russ $ectiO"6 throll>(huut the study
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<br />re"-ch. W"t,'r ""rfaoe ele"at1,,,,s at the cross sections ....,re lIwd ~lI pre rare
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<br />the flood proHles, ,"'hi~1 ts A-I thr"u!l:h A-9d. whi eh ..h."" ~he "ttea",bed
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<br />elevation in relatio" to Ill~h ~'atH elevatluns for ti,e !(]-\lear '\n-y~"-r,
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<br />100-year, and SOD-year frequency floods.
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