|
<br />Th:~ fI[,<><1 hlw.ar~ <Iud)' wa, ",,,d,' undl'r
<br />r(jntinuLn" a"lr.()rity provided the Corp" of
<br />
<br />INTRODUCTION
<br />
<br />[ll .J ur." I ~17, \, [, fj""d pJain in [''''''1,,1 i""
<br />rqH":,,"th,'Anima,l(iVt'rand Il'u'ihlltari",
<br />in the llui'~n>l<i ar,'a w", prcpa,,'d by till'
<br />Corp, of Enlo(i,,,,~,', [O!. Ihr AnLlnR< Hc~i"'ml
<br />l'bnninj{(o'rll"i"ioTl.l.a Plat.aC'''u"ty.ancl
<br />th,' City of Puran>ln. It" pur:~"" wa, l"
<br />pr"Ovirj" a b:kic< for' m'''la~ini< rh~1 I>ro",'
<br />lanr" in DUt'Hl\\(" a"d ".Jjoi";">I "f<'a,i,,;ueh
<br />" wal' that flo,"1 h"z~rd, and fi<",~l dn"'''lre
<br />from 'I,,,'v:,, fllt",,~ fh~1< would b.: ,~ini!1ll1./>(1
<br />o!' ,.li,r.inatl"J, TI", n'l~>T't ill"lud,~1 m~p, arid
<br />p,."[ih,, ,I",win" ,!L,' <:_,t..."t [,wi ,[,'pth "f
<br />;numla(ioTlth>Ttcould,'''a""",biyl,1<.','xp.'("u'd
<br />t<, (~'CUT', In (let"I,,', l!li.-), Ih"C;t".of Pur""Ko
<br />rt"'\l~"l<'<j tlhrou\lh the Anlm~, Rc'~ionnl
<br />PI"",d"lI Commi"iofl_ wi,h lh,' cTld"r'~m""t
<br />"flh<::;;ak"fColor",iolthatt;w("o'"l""i
<br />I<:n0n('('c~ """ll1d;' t;,~ ri()(xl p;air.' and
<br />""<;,'I,,)!>,,t(' tlwm u,iTl~ ,1,'lailed h'p(w"aphi,'
<br />map, tlwcil," hnd ,1llrch",,'d, 1'h,' P";1\(';pal
<br />tJ,-,"!xN'"fthi- ""J""'" th0",'f",'~, i'Ulj}['('<,'n[
<br />f:,.,rrlpbinm"l""fth,'Cit)-"of[luranK""nU".
<br />bas;, nf ;"'pr",',~l tr'llt'g""aphy I~ this :.n,1
<br />'"'t~l('~ ~""l">"!'. i. ",1r"'.,,.~I~, ,I,,, """t;,..,lIn.";
<br />plain i~formalion IF!"1) rel~"'\. For l"~mJJI<',
<br />tl1" ilLt,,,,,, fI",ds cI.,lin"a'.,'d f"rn". FPI r~:lt>rt
<br />II C'''" de~iltna!('<1 a, th,' Int"rm,'diat<' H"!l:i(i,,~1
<br />and ~tand:,,",l j-"'uJ"d ~'Ir,,"k An Intc'rmc-
<br />dia", Itpv:iona! Fl.-xl i~ "n" w;th ~ I",ak flow
<br />lTlcwnitmh. tlmt ~\:,' a 1 )",,,,,,'nt d\:\n<ot> oi
<br />L)(';n~ ,.qllalled 0,. <'X"",,'d,'d in any Irivcn .1"'''''.
<br />",.,d a f,'", 1 L\('nl'Y of lJ(','n """1"'" nf ~ll~)['t "'\l'C iTl
<br />1110 ,'."'"'' ()tl t}1<' lonV:-ll""" "\'C)'aK~, ;\
<br />""",,1"",1 !'r"j.-'I 1'1",,1 ',on,. t.b~: m~'. h"
<br />"Xl"'l,t,'d irnm t!lt" TllP,t "'."",-c <cumbinalin" "f
<br />h_nirl))ogi(' and lTll'V'(Jr.,!og;l' '-,onditi.,,,, l'e>l-
<br />"""abk d""'a"l.,,."tlc ni 11'<' "''':;Lln in W~il'il
<br />Ihpd"'''''''>I,'ba,iTl'\Llld",.,tudy"n,ll)('at''ll
<br />It '"'",,Id hl'"n ",(1""""1." Ja,):,' fh~L hut"""
<br />thall'"'' ""H'OTl,'.1>I). Ill' ,,\p"I'\<'d t" ,~"'\JI' ill
<br />a", I'HI H' ,"a,' \'<'~,,., );, f ""'-1 \It')l<',' or ".',-u..,
<br />"'m"'i'~"'<'\l'r",,,"i:":l'I,,,,'ifi"li"]('I"'l'l,"1
<br />
<br />E"lo(iTl''<1r,inScl'tionZllfinIL''eIUiillFlood
<br />C,,"trol Actl,PuhlieLawHf;.f,'151.~"Rmend(.,j,
<br />
<br />BACKGROUND INFORMATION
<br />
<br />1,"":'''''l'lhlol.uric<''''('''..diTlv:t''tr..,:I".1
<br />i'r(Jd\J(';r,~ chara"t"ri,ti", of th<' par.ti'.'uhr
<br />,tr,'aFT', r"uhU'O' fI<xxl, d((li~('at~d in l:~i" ,..,p,,,.t
<br />;<r,'d..,iJ,:na(cd:"l<j(f-and;;()(j-.""arfto<"i",\,
<br />lTnplit'd, the. 11#1-,'""r fI(~)d ~nd t~e IntHr.w'
<br />dial<' I{pl(ional ~'i(J<)d ar<' "ient;c-ally d~iiT\~.d_
<br />,\ ;)f)0-,"'"'' !h,,1 ha-h" I).~ pCl"~<,nt chanc," of
<br />k'inK"<tllalh.d ""('xc,'ededinan\',,:i\"'n,v<'~r,
<br />und a fr"<tut'ncy ()fuc"ur,',""~~:o[ aoollton"." iTl
<br />;ri~1 y('u"" "n th"lon".I"",n av",.ai<t', Thl' !lHI-
<br />and "OO-y""r ~h"l, h"ve hccn deli'H'~t<'d 10,.
<br />tjli""'I~".tlx'c"",-;,-,-.fI""I'orth'",,"'a;(ni:ll(h',
<br />a["('lltilizt,cl ir, the N"li"na! Fh~lln""-""""
<br />l',.oKram_
<br />Th""",'li,'"FI'I r.-.[x,rtc,w,_..."tltl-..'l\niITl'"
<br />Riv",'a",1 Ljj,(htn('r,.llln"tion, ,,,,d/lr)'Guleh
<br />('">"k,, Thi''''')lort lh1' not inl'iud~1.ightn"'"
<br />(',',~'k !>('"au," it w", not ""''-''j'(~1 i>,1 _''''
<br /><1,'("i](".I t"p<)j,(mphie m~w ".,a<l<! 1M th,' Cil.1'
<br />"f)lnl"anY'), ,,,,,I h"l'all".th""rl,,'k,,-illlw ","
<br /><'\'~I""l.,d ,,,in.o: 11('\\' d~1:l in an ,,"-;,oin.: fi<<xi
<br />",suran"" 'llld}' IJala ,](,,",,1.)1"',[ I'H- :hi~
<br />""Ix)rllm"pi>'",,, f\lrni,h<,d t" ('amp p."^'''''
<br />,I. M.,!;,", 11", 1;""'IL)"i~"('''Tltr~N t" m~k" Ih.,
<br />flp,,,I;,,,,,..anc..'llld)'f,,rtlwh.,j,'r"-llnc'lJr-
<br />~n"~' Admlrl;~u-"tinn, T,,.. "pl""r p<>rtion, ..f
<br />th., ,tudy ,.~,,('h(', "",<:1 fnr the ATlim,~, Hi",,"
<br />and .JUl'Ction ",,,i Dry ';ukh Cr"(,k>; ,~ th,'
<br />"I'i;,inal ,'P! ,",'porl w,'rcnc,lcoV<'1"<.d hyth,-'
<br />",'I\' (h,tall~d tOlx,~"ajJhi(" mi'i'" purd'~",'d b,'"
<br />lh., city, Th~..dur", _,inr~ :h,' l>riKim\l F'l'J
<br />"('t~>rl i, out of !,,'int. lh6(' "tn.~m r.':<dw'
<br />\,",'fl' includ~d in this "~lx)rt"Tl Ih('b",i.,,1 \h.'
<br />'0!l()~'r~phi~ ,hla "".,1 for tlw Fl'l ,."[X,,.\.
<br />T"IX''':''aphie ~at~ for t}", UPPt.,-)",,,-t,,,,, of th(,
<br />:\nim:L~ Hinr\llt><tr<wn f,."m mtl,'I;U.7Iw,'""
<br />;,,,'ni,h,,,1 by Ibe C"loradn W"t,'r Con,",,'\'a
<br />lionl1n"rd_.'\,,,('n,',,llarytoJ,,'<'p:leatio,,..f
<br />\hj" ""lx,r\. n<x~1 pi:<in, i..r :1", It#l- and :,I~I.-
<br />.\"'llr fI,~~I, IV('ro' d"lin,'al<'d on ""prod"";,.I,,
<br />,...pi." of \h~ '''''':11,,,1 lan", ""..If' ,nap', or
<br />11""",,1"'" ,,,,d I'",'r: i~h,.d d;""'tl\' to thl' ,'il,1
<br />
<br />Thr study are" forth;, repnrt"ompri,,',
<br />lh~ fI,~)d plaitls and imm\'d;ntely adjaN'nt
<br />area~ "Inn;>; the Anima, Riv('(. JundioTl
<br />Crcck. a",] Il,'y (;ukh Cr~.k in and "dj"l'cnt
<br />to [)uranlto,,/unctionCrc<!k iotributarytothe
<br />
<br />Anima, flivcr and !lry GUll';' C~ek i,
<br />tributary to .Iune\iun Cr~,'k, Thc Anima,
<br />Rive,. is triuutar)' wthe Colorado Hinr Vla
<br />the Han Juan Riwr. Specific data on the
<br />,trl'll.ms undcr8tudy <<re'
<br />
<br />From:
<br />LR PoMa Rd.
<br />
<br />LlmU, 01 Study
<br />Up"rnm 10'
<br />San Juan Nato'l
<br />f'orea,Il<mndary
<br />
<br />Approxlmale
<br />Lenglhln
<br />SludyAl'9a
<br />miles
<br />"
<br />
<br />Approximate
<br />Drainage
<br />Area'
<br />sq.m!.
<br />7f~5
<br />
<br />San Juan Natn')
<br />For,"'tHoundary
<br />Ca~yon mOllth
<br />
<br />Name 01 Stream
<br />
<br />Anima!' Riycr
<br />
<br />,J,wc\;o1\Crcek Mouth
<br />
<br />Dry (julch Creck )"Ioulh
<br />
<br />,'\' d,,,\',,,"""~' ",',d ',(,'''',1" ",,,,.t
<br />
<br />,
<br />
<br />:111
<br />
<br />,
<br />
<br />Fn>~\ti>~San./uan ).1ounlain" Ihl',A.nima,
<br />I{;"<," fln.,\."' i~ ~ ''''''h_,,,,,tl'''""h'rly ,li"'.'1 i""
<br />thl'"u]!;h'leep,narrowcHnyom;totlwT\~a,'lyl.
<br />mil<' wid,. ....nim..' Valley, which ext,'nd" lor
<br />..pp,.oximate!y 15 mil,,' IIp"t,.,,sm from
<br />Dllr'lrl!l:O_ Glaciatiun' ha, l'arv~d this "alley
<br />inwawj,j".shallow,;,entlyslopin\lconfi>lura-
<br />tinn :tlld dC[,,~,itcd terminal moraines that
<br />"onf;n~ th.. fI,"Kl plain al. \11<' lower cnd,
<br />Dow",;t1"<'am, thc river ehanll'e~ from a "lowly."
<br />flowio]!;, mcand('rinl! stream Iwilh a charac-
<br />t.",.i.lir h,."",-j n",~l plaiol 1<, a relativdv
<br />,traid,'.. swiftly nowiTl)>: 't1"l'~m with "
<br />~"rrow fI""d plain that tra,.".,e. th~ City "f
<br />IlumO!l<l, Th,' flrw>d "arryiTll( "apal'ity ufthc
<br />"'",... i, rdal;,-dy "mall i" Ill,' Anirn'~, Vallc,'".
<br />hul ,;uffici"i\t to p''', m,>d",."I" fhxJ,
<br />lh"'-"1I<bont thc' rpmaind('roflhestlldyar""
<br />.JllnC'lion C",'ek ri,,,. in the La Pla(a ~luu[l-
<br />,,,,,,,, ',"rthw.',,- "f nllr~ojl'<" and n""" in a
<br />
<br />,,,uth,'a,,t,'r!y <li""('lio'1 i""m it.' ")"l'O~,' t" it,
<br />"'''''Ih_ In tn,' "Iud,\' a,."". t.h,' str"a'" flow,
<br />"wiItly ;" ,mall. wdl-defin('{1 channel, that
<br />ha",. <:arryinlo( rap~~ity tn pn^, unly minor
<br />noodfl"ws, H",,",,vcr. h;~h vel"c;ty [Jow, Rn[1
<br />flood l>orne d.'bri~ can result in substantial
<br />dam,we from rclativ"ly min"r flr><.>d" D,.y
<br />Gukh C,.",'k {"nows a ,'our",' gt',,~rally
<br />p~,.aIH to.Junction Cre<,k, joinini< th,,( ,tn'am
<br />:,l~.tll L~ mile' up,tr~"m fr"m th~ nl<ltlth, Thp
<br />fl,.xl(':try;n>lcapacityalon\(thclowern'ach,,,,
<br />r>f D,.v t~\lloh Crt'<!k;5 minimal.
<br />EI,'valions in the draina~e ar,.'a> of tlw
<br />~tr,'af'l" u~d,'r ,Iudy vary r.-ntH ~bOlll l;;-,I~)
<br />fpet in Duran>:" tu ovcr H.I)()(I I,,,-,t in th~
<br />_\,,;ma, Riv~r Basin, 12,110(1 fpet itl th,'
<br />,lu~dion Cr<'ck Ih"iTl.__an<i ~1~lO f,,~: In the
<br />Dry (;~kh C,.~ek Ba,iT1. Ve~el"li"n in tb,'
<br />m""ntai"o"""\'''S'''H,,i;l,.,f~r''-'''''', hn"h,
<br />I"",,)~ro,~ I"'''', Met ",\(ot><;w ,tand, of
<br />
<br />,
<br />
|