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<br />",
<br />
<br />lQQ-~"II"
<br />
<br />10,O::,)''',~'',_..fJ,Cl.o,,_ Event.
<br />+Iood e"ent. ,"II" be LJ!led
<br />
<br />"' "vat i On!, at typ i~.. I v~ I Ie" <:"O!i5
<br />
<br />.."<:tio"5.
<br />
<br />Water
<br />
<br />"u..tac"
<br />
<br />'"
<br />
<br />lieu 01
<br />
<br />Ie",....
<br />
<br />,,1""i1tlon5 <:o,""u1."" "1. .",,,,, crOSS
<br />
<br />section were used
<br />
<br />to pr"",,'"
<br />
<br />f..equ"ne'"'' tor '''''ilin..",.1''9 d.."i'3n I'l..I"po..,.... ","..re <;Ire;l;1.",.
<br />....curlt" trem Itru<:1.U"" failure;5 desired.
<br />However, 1."" ,"0"1. important use 0+ 1.1,.. 10D-y....r flcod event
<br />I i".. In +Iood "I.in ,..."..",,,,,,,nt and land u5e plannin9 135 ..et torth
<br />
<br />flood I',ofi '''9, 5hu,1.5 1 throu9h 25, wl-.ich show th.. streambed
<br />
<br />ele"ation In ",I..tior> to ",ate,. ",,,rfa,,,.. ..I.."atlc".. fer 1.1,,, 10-,
<br />
<br />50-,100-, andSOO-""..r trequency floods.
<br />
<br />The flood "refil.... mil" be us..d in ..,.....5 wher.. contrOl"""""
<br />
<br />in the slate statutes.
<br />
<br />The State ot Colorado conside.s th~
<br />
<br />...i.....ov... th.. 100-y"a. tlood bound".y shown on the Flood Plain
<br />
<br />100-,.,0'''. t'~'lu..ney t lood as th.. flood "vent to b.. us.d In
<br />d..s i '3n i M9 and ~.oteet i n9 ..t....."tu..... _nd dOle I I I n9" to. human
<br />
<br />MOl"".
<br />
<br />Sin",.. th" tlood ".otile exhibits 9iv" the "..t". ..u.t.."e
<br />
<br />oeeu"ation.
<br />
<br />Th..."to..., ..I
<br />
<br />flood plain "'9ulations a.. ba.."d
<br />
<br />elevation at.. s"eeitic "oint On th.. ."f".ence linl!. the tlood
<br />elevation.. c..n be &u.veyed On th.. 9.ound to .11..viat..any
<br />disc.e".ncies On thO' b..e ma".
<br />
<br />u"on th..ICC-y..... tlood.
<br />;:;OD.:::1"",,,~_f.1 ood EV"'lt
<br />ThO' SOO-y..a. t lood event i.. USlttu I I n ma~ i n9 the pub I i c
<br />."are that floods 1""ger than the 100-y..... tiood can and do
<br />
<br />c.
<br />
<br />Flooded Areas
<br />
<br />Flood pl..in map.., .h....ts 1 'throu"h ZO, ..how th.. boundary et
<br />
<br />the 100-yea. tlood plain.
<br />
<br />Nor.."lly the SOO-y"ar t.e'1uenCY tlood
<br />
<br />Occur.
<br />
<br />Just b..c:ause .. p..roen
<br />
<br />.
<br />
<br />ivin9 above the 100-y"". tlood
<br />
<br />plain i& ;olse shown On th..S" mOl".., how..v... 'th.. ..id.. tlood plain
<br />involved in this study m...~e it im"essibi.. in mest ioc:ations to
<br />difte.entiat.. bl!tw..en the two fre'1uencies on th.. .."...1.. ot maps
<br />
<br />bounD....y do.... not m.....n that ha is compl.tely sat.. t.om floodln9.
<br />
<br />The SOO-year flood event "..n al..o be used to. ."9ula'tin'3 hi'3h
<br />ri..k developments withIn the tlood pl..in sueh ..s nuclea. powe.
<br />"Iant.., o. the ..to.a9" o. ..anutac:tur.. ot toxic o. .."plosive
<br />mat..rials.
<br />
<br />published in this repo.t.
<br />
<br />Th.. tlood "lain boundary ~~s plott~d
<br />
<br />usin9 flOOd contou~ ~Ievations ..nd Stationjn9 t.om thf "lotted
<br />
<br />f Il:Iod p." ~ i I....
<br />
<br />Th i.. wa~ don.. at ~ I ..vat i on i nt,..v~ I S <:omp"tab I"
<br />
<br />8.
<br />
<br />Flol:ld EI..vatlon
<br />Flood c' est e I ~vat ions to. tha 10-, 50-, 100-, and 500-v..ar
<br />
<br />with th" "af> contou. ;nt,,"v~I~.
<br />
<br />Flood contour, 5ho~n as "i991y
<br />
<br />Tab I.. 1 "F I ood F'~"'Ullncy-E I ..v..t i On and 0 i schar9" Data".
<br />
<br />F i 9Url'~,
<br />
<br />line.., e~tend p".pend i cu I a" to the d i .ect i On ot t 11:1'" and
<br />;nt..rse"t th.. 9round at th.. ~dge 0+ the tiood plain.
<br />The B" e" i nC I uded "i th i n the 100-vear flood I; ne boundar ~ is
<br />about 3 ,850 ..".~5 for the 16.7 .. i I,,~ of . I v~. .
<br />
<br />t I OOolS, as ol~te" 01 i ned ~t ""cM crOSs sect i On, ma~ be found in
<br />
<br />5 th"OU9h 7, show " 9.''''1, i "'il i .e"r ""en tat i On Of "' i 91, w"t..~
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