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<br />FUTURE FLOODS
<br />
<br />100- AND SOD-YEAR FLOODS
<br />
<br />i\ltl\(\ll"h fl.",ds with m~~nitwl," ""d
<br />fn'II1""",i",fi,nibrlolho"'offi""btnath"vc'
<br />(","'art.c.: i)'thelJa't",,"ldt"'eur:n:h~f,mJre,
<br />d,,,',,,,i,,,, of fulurl' [11l"d.; In this r"l~l..t
<br />..l'lat.'''prin..ip!<II.''1<1th''''.d.,.,i....nawd!<'1110-
<br />~",d :.IIII-y...ar fl,""I.<, A 11111-:"''11' fl(,,){1 ha, a
<br />Ilt'i(~ flo'A' "m""itud,, with" 1 w'n'l'nt chanc~
<br />of I~'in-" "'1L,,\lI,..1 ".. eX<'r'HI.,,1 in SllY >riV"ll
<br />,W""'. or S fn'<jll""(,Y of .l<'('UrI'rm'e of ,\I~.llll
<br />0[1('(' in \I)()}('R" On tlw Ion,,; I,','m 3""""~'"
<br />"imila..lr, " '~~I-".t'ar fh,d ha.' " )leak flow
<br />tTH\l{nilud., with "I.J,~Il<"'('enld""l("'"[lwi,,,,
<br />"'111"IlN1 ",','xe,,.,d,'d ;n an)' "i,.t'n y""", Ijj'a
<br />freqlU'tlt'..v "I I){'Cllrrt'll('t' "r "bout I)n"~ in .-,I~)
<br />y('arsLl"th"lo""termawt"R~..,Studi,,"llwl,..
<br />for thi, rq)<)rt"h"wtbat."'".".....flcx~lin"int".,
<br />,Iud... "r"" ,'an N'sull from j(~n"ral rain
<br />"ee"rri"J>:dur;nl{th~pcriod from law "l'rin"
<br />It, earh f"ll. f..om ')lr;l\j(-"~rly <llTrlllwr
<br />"")\';m,'lt"l;,,n"'nl,~1 hYW'ncfalr"in,orfl'.ml
<br />t'onv('(.t;V('typedow:lhur,t,tor",,;n'lLmnwr.
<br />.'\]W~ifje"IIj", th" m,,,',' ."'V<"'p f1oo')," nn th.,
<br />Ya"'p" Ie;,'"" would rl,.;"lt frum '.,-idp;;l,..""d
<br />;:"'''''',,1 r"in, TIll' "'or<' ",'H'n' fl,~"I" ""
<br />r"nt'I;fic"li(mCr~,'k ~T1dth,'d"Y\1'UIl'h,:<under
<br />~Iucl,. '''''uld ,.",,,It f..om dOlldhur."l ,torm'_
<br />f;.'n.'..,,] rain,lorn" ,'omhi,,,',1 with ,,,,,w.
<br />mell """dilion" h"w produr",1 tlo' maim'
<br />flood.' of reeonl in Ih" Yamp" Iti~,',. Ba,in,
<br />"l'h,.". fl""ds u<unlly (",,'Ilr durinil tll"w,'i,,,J
<br />'\I'ril Ihl'<1u"h .Ju,a', A ;,IIO-)','ar slnrm (7~,
<br />hn",',hLr:<tion]"'1ui..-a]"lLlt,,:LiIW"C"'FLlnrl.'lC'
<br />p"ol",bh' "",~imu'TI Pfl""jJltat,o" 1",-"n"",1
<br />r"inl fO..JUM \V"'St'Il'L'lt'.Jj'",'u'~;nl'()mplII-
<br />in~ II", ,-"lll-F'ar ~I,)()ll_ I'r"hahl" "'"xim",n
<br />pl"<"C.'ll'ita(l<ln "mO\Lm< \wr,' f",""i"h,~1 by tlw
<br />H...,h'nnlt'tl.ot'()I"~i,.,,II'I'M('11 oflh,' ",,,li(>'11>1
<br />W"ath,'rS,.n';("', Tb" fn'qupnc\' of the ,tnrm
<br />,I"I,,<:[,'d \V:!, w,'ifi"d hy II ~.I-hnlL" ]>oi"l
<br />,."inlall "Iud,. nf th.. p",'<:ipit"ti"n j('W" a,
<br />('r"i~, I\'"k nUI..- f",. Ih" Wo-,\..'al' fI"KI on Ih.,
<br />\"a"'I.'" i{;\'er \I.a" ""ad fro", a flow f,...<!n'''ll'\-
<br />L'''''W eOlllplItt><( fM.' lo..."bon dnWTHn'<lr\1
<br />f '""111 1 il,' ! "i "t \1.1'",",' F. "'1 i li...a ~i,," {' ,'",.k
<br />
<br />inflow "ntH, I~(. ..i,'C'l', TI", IIIO-Yl'ar flr",,!
<br />h,\'dr",,"uph w,,~ l'altL'rn"d af!{>,- tn" Apt'll
<br />147-J rh"I,.v,.'lti<11lay,kn.
<br />
<br />of \'e~e(atinn i< I"", Ihan in lhp hi"her
<br />~ieva(l<'" "n',," "f F"rtilkation Cr~"K <<nd lh..
<br />'lamp" Rin.t.,
<br />l'e,,~ flows thus d~,'plorwd f"r the ll~)- and
<br />.',I~.I''ypar floocl. l\il~ethpr with r'wresl">ndin"
<br />water.urf",,~ ~I,.\'atl"n.iat ea,'h cro"."eClioll
<br />u,<ed in tlw h)"draulic <lnaly,e< made for thi,
<br />:;tud)-'!<r":;howninT"bl~:,.rnf,,rmat;l)nonli).
<br />nml.~Il..<"..ar flond ('vrntsw"'al~nd"""!op",1 ill
<br />conjun~I;(m wilh the hyrlrolo"ic <t:Jdiesmadc
<br />
<br />for Ir.is r~l~"'t. Th,'se fl'JO<I ,'\'ent" on th"
<br />'iamIX\ Ri"".. wouid r..,ult from snowmelt, On
<br />Fo..tifie~l;on Cc.,.,k "",1 th~ tribUl-ary "uleh.",
<br />Ihe ,il)-year flood would ",'Suit from cloud-
<br />hllrsb, and the lO-y,'ar n".(~j would result
<br />from'nowmelt. Wilh Ihe~xcepli"n of,howin;r
<br />tht'ir fluw, and waler <urfa,'" elp"ll,lion, iI'
<br />Tahlp:l,,,,d Ih"irpr"fil,"un I'Ill,t(..~g..H,th,'
<br />11\-and!")II-y"arn,""I'areMtt(j\'en'dfurlh~r
<br />in this report.
<br />
<br />..\ a..h"w' ,,).-mdhur,1 t.l"[>e Ihunde,",torm
<br />wa' ,,'IL'.'tl'd for' ionmptltin" rainfh~".h On
<br />Vo,.tifi""lion Cr"ek and th~ j('lld"., Ltnder
<br />,t~dy, "l"hr. ;ioll-Y"i"'cloljdbu",lstor'ms.>l,'ct"rI
<br />W,,,,',-!ui..-a,,,ntto ,j(jpcre""tnfth,-'d"udbur.t
<br />pl")balM m,,~imLJm prt'ioipitil!lOn [uenished
<br />h)' Ih., Nalional \\','''th~.. Se..vin'. A :l-bo'Jr
<br />l",itltmi"rall,ttld,\'()fthepr('cil'itationJ>:a"e
<br />at Crai~ for th,. 1""'i,,l ~1ay tilro"vh SC'[)'
<br />h'ml"",' \-'Prified 1IL,' fr'-~F"'n"y of Ih,. ,Umn
<br />,,,,h:t.,.l. Pn_~'il'itali()n forti", 11l1I-.vparc!oud.
<br />b",.,t <\il"m wa. I,a"l,d nll t;O l~.'..('''nt of I.h.,
<br />!)IIO-.\-",'a.. douclbuf.<1 storm ]l,'p"ipil>ltinll. Th"
<br />l",r(',-,,,I<I,,.. lLsl'd wa. ,k(('rmitle~l from th.. :\-
<br />1)<,url",inlr:,inf"ll;lu<1y,
<br />
<br />TABLE 3
<br />
<br />PEAK FLOWS AND STAGES
<br />10-,50-, 100., anrl 500-YearFloods
<br />
<br />Cross
<br />Seclion
<br />LocaHon'
<br />
<br />Peak Flow ICubi" h'd pel' "~coml)' I Slage (F':NI'
<br />10.YearFlood SO-Yea'Flood 100.Yea' Flood SOD-Yea, Flood
<br />Flow Slage Flow Stage Flow Stage Flow Stage
<br />
<br />YAMPA RIVER
<br />(D,alnage A,ea 1,873-2.150 Sq_ Mi.)'
<br />
<br />1:1;;,:19 ]~,t##1 1;1';:;,2 F"sOO f;1{"U l~.:'(~1
<br />l:tli.';2 UtH~' t:lli:lA 15,?lQn t;Jhl.4 lli.:ll~1
<br />1:\l(,~;1 I~,'~)\l .;1',:\..) 1;;,litlO ()H;,U: I~.:;'#)
<br />I ~~I ,Ij I I~J~l(1 .;1il:UI I!)Y\I() (11f;,i.() 1~,.11~)
<br />l:l!I.12 ]~,II{~I tW;t2 I;;$I() r:lh,;,~ IR,:WO
<br />]:n:l2 ]~,I~~J 'illi:,.1 1;),Hll() (\Hi~, 1 ]l<,:j\~1
<br />1:\!H2 1~.!~~) tiln:'.7 1,'"lino "W;,!' ]H,:ltKI
<br />]'l!U" 12J~1O t;l!;;'.b l;;,Hntl I,H;6,~ ]li,:It~1
<br />]:1!U7 l~_llnll ti t h,-" ~ 1 L~"HOIl f;tli7n lli,:l'~l
<br />]:\~I_;;-1 l:!.l~)\' lilti!)_ 1.~.I~nIJ ';\1;72 ll-,:lt)\1
<br />1 :-l~).1;7 1:!.l){)\1 jilt;!;,:, 1.-'.Stlil ,;](;7A 11'.:j()\j
<br />]:\!)X? 12.l){)1, (;](;Ii.1 1.i.I<OO tllti\J.1 lk,:\HIJ
<br />l:,!I_!I~ t2.{~~1 litt;H" lii.H(l1I I;WJt' lli,:WII
<br />1111.0[' 12J~~1 !;l!;fl.li l;dll!l f,170,:, lli.:WII
<br />l,lII,li" 12.l~#1 1;1.1." 1.;_"nll t;I.~.1 t~.:~HI
<br />1411.1\1 1~_t~JII 1:t7l,f; l.i>;(11I t!t7~.-, lli.:1Illl
<br />111121 1~.'-'01.1 li171.\; 1.,-goO t;172,(' 1~.:lIi{)
<br />lW,:\Il 12,000 1;].2,1 1.,.61111 GI7:\..; li".:lI10
<br />1~1I, hi 12.t~ ill '117:1..', ];',N.1tl '1174,7 1~.:11"1
<br />;_10,1;2 12.IIC,{. .;174"., 1.-"....00 .;]7<12 l~.ilO{i
<br />
<br />l:nil hydro"raphs ~nd loss rail" for thp
<br />r"mpa Ri".'r fh<i" wa" ,,,timalt.d du" to
<br />I"cknfr"I>rr><iueibh>filinfl,,,",,,sin th"'l1.Idy
<br />art'a, Th~ unit hydruKraph \Va., dt'riv..d by lill'
<br />sumrnat,ollJ>:r:lph(S-j(raphlm"thud,Ulilitin"
<br />"n .'\'j(raph lI,~d in lL. r......'nt stUd,' Dr th~
<br />l\nin1<\< River at. J}"r~n"." ..\ mL"'''lai" :'-
<br />J!'nwh typical of "mall,'r draill'''''' ha,i", was
<br />LJ",d 101'r,-"lu..e unilhydroj(raphsrorYurtifi.
<br />caUn" Cn"'~ a",1 tbe' 1~"lL.l draina~e art''''
<br />around Crai". TILi" m~lhn(lol"J>:Y is ~on"i"(.."t
<br />w;t.h th,<l ,,-,,,'<1 for similar "ludi", in the'
<br />.'\t""",I,,",t I'prin",. Ran"ely, and l,(~:k
<br />;;:prin~' (W,'(mlin;>:) "r"~s. A ".m,la"t 10"" o[
<br />0,1.-, in"h~-" )"'" hour, wll;dl i"'o",,i,((o,,( wllh
<br />ra''''< ",,'d ["r "milar studi.., m thp H.~,,~,'ly
<br />and St~amho"t ~l'rill~' an'a', wa" u<<'d 0" "II
<br />a,",',,, within tll,. ,t'o",' ,.f n". stud,,', Initial
<br />k"in w"t:ln" lo,.,',,,fO,75 indw,f<>r Fnrlifi-
<br />"atio" Cn,,'k "nd '" m,,~h a, !.tiO i"dw< for
<br />:h,' Yamp" I{;\','r upsln'al" from th"l'oint()f
<br />FO"lifj""tiu" (',..'.'k i~f1"w "'!.'ft. a,lojJI'.'l, .-\
<br />!uw,'r ;nit.i,c1I<>"" 0,[,11 inch"", w~, u,pd f~r Ih,'
<br />:"";11 ,,,'."~' ,ltwmr) l'rai~.l"'L';\l'-','lh,'<i"H,il.\
<br />
<br />(:Iti4,!l
<br />I'H;~,l
<br />l;tI;;;,~
<br />1:1(::',1)
<br />fii!;:',H
<br />
<br />litl;h,7
<br />1,lm.:l
<br />hl!)7.;;
<br />hJf'.i.!,
<br />t;l'-'7.!'
<br />
<br />h16~_1
<br />t,II,\l_,
<br />1;17Ii.;!
<br />t,171.0
<br />H 1 ,~_~)
<br />t:17:W
<br />(;17:U
<br />f;17U
<br />t:17",.1
<br />,:17,;,'.
<br />
<br />~9.1I'~1
<br />~~.l#~1
<br />~!)-'}l.l()
<br />2fl,Il(~,
<br />~~I,lIt ~,
<br />
<br />2~1,i)\l()
<br />~~I.!)()\)
<br />~:I,iJ()O
<br />2;;,111)(1
<br />~;o(,'I\)(j
<br />~;o(.I100
<br />21','K.1I
<br />~1i,OIWI
<br />~;o(.lI(~1
<br />"!H,t)\l\)
<br />
<br />2'i,I)IIO
<br />~ti,;;I]tJ
<br />~!l.()(~)
<br />~ ~\\"H.~l
<br />2ft/"i..
<br />
<br />lilf:7,~
<br />GIfi7,.',
<br />')]tn.l;
<br />f,W7,!J
<br />(;tl;I<.1
<br />
<br />!;if;l<,fJ
<br />f;I!;!:Ui
<br />1;lI)~j_H
<br />i;1.7(L_U
<br />t;17!!.:,
<br />617(1.1;
<br />1;]7UI
<br />hI72,~
<br />tll,~)<
<br />',17,U
<br />
<br />1;17ti.0
<br />6]71;_0
<br />t:17t\.;;
<br />';17.'<1
<br />tili.'<.fi
<br />
<br />t",..,...." or, r;"" ,.,,1',,"" "" ""."."""..."", <I;,'"""" d,,, I.. ..I''''.,...., >"."",'" "'", ",...,!""., i,~.,," ,,, ,;"..., (h,,, ,,,..,,,
<br />,,,,,,'o.''',,,;t':i,'I-'',li,',,ll'',,"-,o,- lK~'Ai"'t"",,,,
<br />,hl"".,:~t"."".,r'''''''''''''',_"",;"'YcL,,.,,,,,lhe<;f,,,,,"W'""""'.....,.",."""",.."'F"."("."",,,,.,,"'.,,,.,- y:'""",p,;'.""
<br />"""!".'~l<"h ,.h,,",.,,'II, H".",-,"'" ';,.kh.- ",,,f (',..!",. \1,,,,,,,,,., . ;"".." ",.,<1 f"" '1H't".""., ~;."". t.,,,, ",.~,,,,;t:,., I,",'" ,,( 'h.'
<br />)[i"I.,,,.,,.,.I,,;,"<,-,t,-,.,,,,".I',,,,,I(,,t","i'.,,,,
<br />'\'''''''''''''''''''''1",.""".,.""1',,,, "(",,,h""'.L
<br />
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