|
<br />l'a,1 il,~,l:, in llur;wKn and adjoininjt ar~r,,,
<br />h~V<' ,ii'ruptcd hiSl'hwa,' aml railrnml trawl
<br />'I'HI ""mnmni"ati"n; ;.t'rvie~', ami uama~e<l
<br />nt. d~,tro..."d r,",d,;, hrid!"." huildin~' and
<br />th,'ir e<mt"n\>'. railroad and p<.lwer fUfiliti,",
<br />I)W '~'V'W" dl,)\,.,al pl"no. und tlw Stat~ fi,h
<br />hatehH.\', i\~l.,.ieuitu,'al I..",p, du,' w fl",~ls
<br />haw inchcl,...1 d,'"wn<~llivcst('ck, d~"tru('(inn
<br />"r "r'll"in~ CfOpo. ,'''l<<Lun "f or dep",iti"n of
<br />,i<ohri,,,nfarml,,n<i.an<idarTLaKetoirri,,at;o,,
<br />,,',t..m', and nthH farm improv"mfnts, Ovc''-
<br />,;".',.."al':;, ,p,'p,'rcl pe,'"""hu"ebpcndrown,,,l.
<br />and manyothc'r, ,:aullht in f1(j()(iwalpr, have'
<br />"anowly eecapeddeath or ,,'riou, injury_
<br />There arc no ('xi,tinK c>r ,mthurizl'd fl"ou
<br />control f",-"rvoir, in thewater~h,'d,trjbutar)-'
<br />V> tbe ,wdy ar"a. However, ;;onw incld~ntal
<br />flood pruketi",' i"afford....l the Duran"oarea
<br />by Ele~tr'a Lake. a power rle,'elopment on
<br />Ell""., Cre,>k, Heservn;r ,;t.., in th~ Animas
<br />Hiv"famIJunctionC'rt"'kdraim,>:eare,,,ha"e
<br />
<br />been ;,](ontl(;"da, ba,'inl;" IlfJWntial forfloorl
<br />control "Iur;\lfe, bot de,'elojJrm'nt of prokrLs i,
<br />pre,entlyeconomic"llYln(ea,jbl,'_Similarly,a
<br />.,r,anndimprQvenwntprojeetforflooUcontrol
<br />on .lunetion Cre"k ha.> lwen ~tudi,'d but found
<br />eeonomieally in(('"sible, ~.lin(),. ;mprov"m~~'t~
<br />lol' ,'",>:.<;on ~ontrl\l have bL~'1l m"de at ~,,"~n\1
<br />I()('atlon" alon" thr Anim",ll.iver. [luran~"i"
<br />eliKibie for fl,~~l in,oranee under the enwr-
<br />Kf.'nC,I' pha,,' of the ~ational Flood In,ufam','
<br />Prc,,,rarn Th,' eit;, will b,' cor.ve,.ted to the
<br />"'Kularprogram"ne()mplet;on"fraW'tudie~
<br />noW inpmKre>s,Th"Ft'uerall'l,xx11n,uranrl'
<br />l'fO....""1T1 r"quire~ the eity to ad"l-'t amI
<br />cnfor,:€ land u,e and control m"a,urp, that
<br />will~id"fut\lrenpvelo!Jmentinflood prom'
<br />afea" in,urhaway thatfutur"fl,~xldama,,('
<br />i~ rt'n""ed or "vo;ded. County mning ordi.
<br />nanC", :",<1 ,,,bdi,'i,ion ,.t'llulation, apply to
<br />deveiopn'e"!;''' in flmtl plain art'a, atljoininK
<br />!Juran""",
<br />
<br />produc;njt otDrm~ :ha, ilCt'urred ir. Oc.Wbl'r
<br />1~11 anrlS"pwmber 1:170J.a,tandarJproj('C(
<br />sWrD! was (kveloped for the Junction Crt'ek
<br />llao;D, Precipitation from the stand"rd pro-
<br />j''''lstnrmthu"derivedli>tall",J!1.7inchesfor
<br />the ar,:a upSlr"am fl'"m the Na:i"nai Forest
<br />boundar)'al\d 8_8 inch<!,fortht'wtaldra;n<ll'f"
<br />a",'aopslreRm ffom the mnuth. The'tandard
<br />project doudburol storm for ohe Dry Gulch
<br />Cr,'€k Basin (~.-1;i inehesofpreeil-'itationJw<l.
<br />develop",1 from 11 depth-area ClJr\'e [or a :J.
<br />hour cloudbur,t eVMt. Th;scur"e wa,ba,ed
<br />On "torm "riWfi,\ u,,.,-j in an ,'ar!ier (197:)1
<br />flood plain Informu,i"n ;tudy of Ih~ Rifle,
<br />Colorado, area,
<br />Theunithydr<,,,raph,aJ\d;~mthdic,torn,,
<br />thm devel"I",l wpre used to computl' Oland.
<br />IIrdprojeetflooc:k Lo" rate, we,'" ,'st;mawd
<br />from thn~", ob,erved in n~arby ,tream ba~in,
<br />with ehara~wri"ties ,imilar to tho",' o[ the
<br />
<br />FUTURE FLOODS
<br />
<br />Stream/l.ocation
<br />-. ,-,-
<br />
<br />..\lth()U~h flood; '~.i!h n'a~"i,,,t!c' "ml
<br />fl'l''l""',,ci,._, ~imllar to lhr.". 11<:'t ;""..'
<br />"e"LLt"r<.'! in th,' I',~,t can "",'ur in th,' [UtLLl"',
<br />di,,'''',<''or, uf futurt. 11,,00' in ~hi, rl'pon i<
<br />li",;I,.d t~ th~,." cl<."i....n"".,d >IS H~.- ,"HI ~I~)-
<br />,..,'ar [<J,~l;. The ""'Rnitutl,., ami [n'~u",,,'i<."
<br />of th",,' fl"xl, haw ~,~'n ~('nl'r:,ily ;lIu~tr"t,'d
<br />a\~'w, :->tudi~, "'ild" fur th;, rcpor( ,how that
<br />tilt' ",ml "'ve,',, fl,"xi~ il\ th,. ~t,,<i) ar'.'" ."""Id
<br />"..~"It from 1(1.''','"al ""in"\<lrtlW on th,' lrihu-
<br />:a,'y ,I ",inag,' of th.. A~iT1\n- [{in'r LInd
<br />.Iutl(.ti"n ('",',ok. "nd f,',,,,, ,,,.,,,n,'li,',, t,.I'"
<br />d""d!,urst'\<'l'm,oYl't'tll<,tnintl",", d,'ai",,,,,,
<br />,,11l,'y 1:,Mh ('ft,,'k,
<br />!.h'1o','m;na,in" "f I','"k flm", [",' tlw Ani.
<br />ma" Iti",'r w,"' h"~,,l on a f""'IU""",. a,,,,I)..i.
<br />"~,zlr,'a,,,flo\\' ""('",...10 fUf th,' "'at Dura"",,"
<br />iU"""" ~""". Si,,",'ifi,'al!y. a" ntn''',,' t'I,,,,~!
<br />,[,'nl"p,'d fo,' "" ,,'d,., point ~,p,t'"""'" f""tT'
<br />tIL;' 't",I)' an'" ','-'h t''llll<'d dm"n""'_''''''
<br />Ih1'OI'l!'il TII" ,1lL,i,. an'" TIl(' rd"t"""I~,:"
<br />I,,"\\'.'<,n I"'''' fio,,,, th',," .,,,,,l,li,h,I r.,,'
<br />
<br />",'h'I,',.i <'rllw"ttTraci"o l"lLnl" In lfW'lil<'Y ",,",'
<br />nnd p<,,,k flow, 01 th,' flood "tlh<: ,.-a",' II.l'",>
<br />appli~d te> tlw ll~l. and ;",I~I-y""t' n,xxlfll\w, ,"
<br />th""ag-,' t",i,'ri\'(' peak flnw, fo,.tlw 11~)- "",I
<br />,.,I~'-y<,"r r,,,,I, "I. th,' t'.'s;",,'t<\'l' <,on(','ntratlOn
<br />lx,illt'_
<br />Ill", to th<' \'('t'.\' "hot'\ ,,,,'amflnw """",.,1
<br />a\"lilabl,' f"r ,lunetion Cn,,,k (1~'~I-';;,\, an,i
<br />t\1o'all"'nn-o[,tl't""11t'ln'.\',b:alnrllr)'l;uieh
<br />('rc'('k, fl"w~ for the 111(1- ""d 511i.I-Yl'ar fj,,,,xl,
<br />f,.,r ,h"^,"'.t'l'a,n" \I."",'d",.i\wll,'r>m'yttt'U'li('
<br />fh,l~ tL,;,'d in "<lnJunc':i"n \1',:1\ I~>ak fl,,\\'
<br />fn"ltH'n(',' "u,'\',,,, from ,;mila,' drai"a",'
<br />l"dnsinth",'cl'i,,,L. Cn;lh,'rlt'm;mph'\w,'"
<br />dp,'iH'tl iJ,' 11,,' S.l!'t"aph meth<<!. Iltiliz:n""
<br />~~,'n"fal m",,"tain S-~""I-'h_
<br />Hi~u,,.i,,ally. jte'lt'nd 1'ai",to,""" :hat ...."n.
<br />,,,.,,:,, major fl",x!; ill S<1uthw",t.N!l{'"iLl"'''!rl
<br />hav~ ''''I'U,.,-,'<I ,]lIri,,~. C:q>t"mb," :md
<br />,l,-lol>>'t', 1.";lLl( ~"n .i""" f{iv,'r lb,i!! tl..pth-
<br />"re'" c'un-,', If..,' l~.i'"i''' ,'ai11;t",-"" Ibrlol'
<br />';1" 1""'1'.1,1,,,,,,-, ,,.,_,,I,'r, ~nd ;,,,,,.01 "11 11...1
<br />
<br />..\n;rn",l{i,,'r-
<br />at:-'an.J",,'\Natn'i
<br />F<l".'s(JI<",nd,,,.y
<br />nl~)\'l' .I\ln('tirm Ct'<,,'k
<br />
<br />. p"."".m -'!:....,,'" ,"""
<br /> ... -..~" ...,.
<br />aT I~l ]'o,ta ltuad
<br />
<br />.i'''L<'1'''':J Cft,,'k L\t:
<br />~"" ,I""n ",,,tn'l c'"",,,t
<br />i;"',L,,,t,,,,.I'
<br />..\"i"""lti\'t'l'
<br />
<br />IltS (",1,..1, ('"c":~ ,d ,I""..tl""
<br />('''''f'k
<br />
<br />Sine" th~ Inwrm,',;ial<' R"l!'i"nal Fh,ci in
<br />th,' 1~7-l FPl ""IWr! an.ltb: I'H.I-}','"rfloo<.l i"
<br />lh;, ,-~>",... ,,,',> idc'nti",,:ly "efLnc~l. tiLt''''
<br />"'''l!'llittHl,', in I"'l~ n'!"""I' ,h~"I,i i... ~quiva.
<br />
<br />,
<br />
<br />:;~r<'am b>l,in, und,," ,tud\'_ 1,0" rate" a~o;\l(vi
<br />wen' I1.o'iO in"h,'" initial 10'" ~nd 1I_:lO inche,
<br />per hour COll.,tant lo,.'t<n JunctiolL C"~ek, ;\".1
<br />[\,28 inche~ per h~Uf con,tan! 10';', and iJ,~'~
<br />inch,,, d~l-'re,,;rlJl 'tor~....(' I,,"; on Dr;: (;"ich
<br />Creck_
<br />Th,' ratio, of 11~1. and :;II!I-,.('a, lX.ak flows
<br />t" ~ta",lard project flood I,.-:ak fl,,,, u,tab.
<br />I;,h(~j from" l"-'aK flow fre'l\len,'y ,~ur\'e
<br />avait~bl('f"rtheLi!,"lm'rCfeekBa,in",'.nit'h
<br />adjlii", th"Jun"tior. Cn,)k Ba"~tln thf "'f't,
<br />WPfE' lJ,,~1 toohtain peHk f1nwooftne 10)-"n<1
<br />;~III-y€ar f!omb on Junetion Cre,'k. For Dr,'
<br />(;ulchC,'eek.th(,rlIti""ll,,'dv.,Ht''''itabli,IH'd
<br />fro", aeloudbur"t flood p('ak now frp<!Ul'n",..
<br />rurv" from a,imilar,tr..am ha,in intlw[{if:,'
<br />ar~"
<br />Peak flow; thu" d..ri,."i lor th,' ,t,'ra'11o
<br />"ml('r.tudya1't"
<br />
<br />Peak Flow
<br />(ds)
<br />
<br />100-VearFlood
<br />
<br />500.Yca,Flood
<br />
<br />:O.:,W'II ill,',I.,
<br />~~.'~H' ;lS,I~",
<br />~,!".;" ',,,,",,,
<br />:::1.;~"1 III,IH'
<br />1.""'" ,,1'11'
<br />l.:t-,'.., 7"IHI
<br />1,~:Il' :',I"XI
<br />
<br />h'n:, l1"w,'""r, th".I' diff,'" d,,~ ~o ll"W tnt(',';a
<br />'-'",,, '" (il(' h."d""lovie"n*,-l)',~, 'I'h""<,,.-ih'";a
<br />:"',, """t"",,,1 in ..-"ide:in", puhli~h<'(j In
<br />~hr,'h lfl7fi ~,,- th~ Unit"" Sta:", \\'a:"1"
<br />
<br />,
<br />
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