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<br />Flood~ay Delineation
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<br />c.".,
<br />By:
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<br />4973.0'1)'
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<br />At Ci,y H,lI, io ".' ~o'"" 0/ "00<
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<br />When en~roach~ents onto th~ natural floodplain are allQ~ed, su~h a~
<br />artificial Iill, the Ilood carrying ~apacity is reduced. The depth of ~ater
<br />or the flo~ velo~ity in t~e te~aining floodplain area ~ust normally lncrease
<br />to convey the Same magnitude of flood, and thus t~e Ilood hazard to areas
<br />near the encroachmenc in increased. Ho~ever, the e~ono~ic gain from develop-
<br />ments encroaching onto the floodplain often outweighs the resulting in-
<br />creased flood hazard. Floodplain mar'lageOlent proRraJlls must d..tErmi~e thE
<br />acceptable limits of encroachment ~hich ~ill allow optimum uSe of th~
<br />floodplain.
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<br />lo ~olj"dl ~~,' Pl,ot in
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<br />A' ~O".""'o' H'gh Schoo .
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<br />!<oo' o! ~o"o.
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<br />"'''".\81
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<br />J"-bO-L9""-49\O
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<br />to" !~1. 01 No,'h E"',.o<< S"p' '0 Ci<y
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<br />No,thol""o>lRo'Ol',"'"..nL"to.ndMaln
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<br />W,","",OfQu.ilRo..,.,<iLI9'oS'<ee'.
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<br />'uno d Su.,' Kill RNJ ."" 0'" 01 II~th
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<br />'0"0 ,(d. of Dia.on,\ Hwy. o~po.lte So. V,a,o
<br />Ct""I<<-Oo~g.,
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<br />The concept of the flood~ay has been adopted by the National Flood
<br />Insurance Program as a tool in assisting lo~al communitie$ in this aspe~t
<br />of floodplain m.anag~lDI!nt. A tloodway is definEd -'5, "the channel and
<br />Iloodpl$in width which must be kept free of ~ucroachment such that the
<br />lOO-year flood i5 convEyed without substantial increases in ftoo ddepth$."
<br />As a ~ini~um standard FEMA li~its the depth increase to 1.0 foot provided
<br />ba2ardous velocities ar~ not produced. Thi.q "tandard has al<o b~~n adopted
<br />by Boulder COl1nly and the City of Longrn"rrt. Th", floodw'lY widths h.we be~n
<br />coroout~d ba~pd On fhi. c~itPria. Wa[~r s~~Iocc clcv~tion, and ~llowdbl~
<br />encroachment widths [or the IOO+YEar floodway h~vc been provided to the
<br />sponso~ing agencies as p~rt of the t~chnical addendum. Floodway d~ta Oan
<br />~e'li~"'ed at thc offioc" 1 ~sted in the pteldc<, of tILl" c"l'o,l.
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<br />U.S_G.S.
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<br />"~9).)l2
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<br />JR-ol-194B-o'9l
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<br />"E Comer "f Hov" M~o "0" .'\;0" Road.
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<br />SE CO<TI"' of ,lo,io. A.,"u, ,od P,;,. S'c,,'.
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<br />"E '.i"ow.,lI of .,c,."h "e'ch " "ov" S<<~.{.
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<br />'0"0 ,io' of "'1'00 Rooo ., No. 8lto .,<.'t.
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<br />'0,'0 li4. of .".l,on "a.d o~po,'t, t of Dc!ve.
<br />ny 00 ",""h.d)
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<br />"8 CO'M' o[ 8"1. ",." ."0
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<br />C.S.G.S.
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<br />w"" :;lde of ~>tj, S",o, .,,4 .6 GO'"eC 01 Air-
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<br />w." Sloo o[ il<>v<'< Ro~o ,"~, """ 1';"",.
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<br />sr. Co,." 01 Ahoon Road ,nd 5<, Vnio ."0'
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<br />~ " "0010.. Co. "'H.66 OC-SV-L6
<br />., " ao"loe< ~. H24,11 OC-S.~ II
<br />'" " So"lo., " 498',W OC_SV_l'
<br />'" " "OU,dHGO. "9~1.90 OC~S.-ll
<br />'" " Soulo<< ,,- '9~'. '4 oc-sv-'l
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<br />'" . Muld" 00. '04~ .6" OC-.V-,
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<br />rilE ~"tional FLood In"uro''';~ I'r<;<!(<"", i~ " f~d~c"l -prOr.rdm that 'm..b!~,
<br />propt1rty Owners [0 buy flood insur"n("~ at ~ rca<ona~l~. ,.ub.,[ctiuJ ""~t. In
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<br />Oc.,i" 70(0" - ".',G.S. ,~~~.,,_,.'" .,,~ ".,.~,". "'" J~'61-""S. .^\ll',..G,"".S. ~,d "S.C.,. ~,~~..""
<br />o,.c<ip"o", .nd .L,..,ioo .,. ., 7"011'"00 by 'ho '0'P""'0 ,s,ne,e.,
<br />,ho 10''''\0"' At. '.'1 gon_..l. V'Ull,d <"""01 ",,'et oa.....y 0. o.'..b_' f,,'" ,bo1.',",,,,,o' ("y 1',.'n,,'.
<br />aoul... CO""'y ~"bUc "0'.. 0< ColotaOO "a<" Co",,,vo<ioo ""..d.
<br />'l'ni, ,0""oL ~..." " M' .'"OWO"O ok. z"P'"S. Out i, ,.'at;..,y 010" ood <nu", "'"'0''' ""'..
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