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Table 1. Sampling tt11nd sampling lrequency. Colorado River. 1994-95 IW"",~t~ ",hml~ -.ampl.:, ,'"Ib:ted Jul\ I'N..-:\",,,mh.:, 1'1'1.1, n1<'nlhl~ ",hml\ ,,,mrk,.;nll<.",'wd Jul~ 1'1'1.1 S<"1H"m,,"II''''.~l ('"I..radnR,,<."tn,'arf"l""''' C..Io-r""nR,,<.",...IPah,a.k' (,,,10,,;0<.1.,1(,,<.",1>,:1,,... IheCiranJ ,'...Ikl C'iln...l<l"e,,,,.n.ncarp...h,...d,, C"I",.,J" 1(".... "1.1~ R""J. n".,tChlh.n Cnl.";W.,R",,,al lir"nJ Jum-lI"n Site USGS number station Ilig.1) numbe, I (1<lI1'l~~I.l , 1'~~Z~III~.;Uql~1 , INHN.l~1l , NCI.lls l(ls.;7_'.;1 ~I , (l4l1N,~1>1 , "HI~21Itls.17.1.lI~l , lI'Il~IIH' > 1141h,1~'~1 Site name Sampling frequency Weekly Monthly '\ , , \,1. .\ \ .\ ,'1' \ \ \ \ \ r"I",...J..R"erall-ru,l" Cul."aill.R"",al R"Jbn,hP"'~"''''I.n""r Gr"ndJundJ"n C"I"r...J..R"",n,:arlh"(""I"r:tdu.I't..h\(,,I" 1m,. IS.mrJ,"~ "nl~ Ih",u~h Apnll'I"~ Monthly Variations in Salinity and Relation to Streamflow \t(llllhl~ \\ale' ,ample, ",'re,'"lk<.'l.'dal el~hl ,ile~ Hahlt' II amJ \H're ;mal~I<.'d fl'r 'ahml~', Hn.;IU...... m<lnlhl~ "u11plc, "al' .;"Ilt'd".lat,i,"I lh""lghl,il"'illler:\pril I'N5, Ih,' f...lll'''l1lg ...n;II~"I' I' h",,'\1 "n "nl~ Iho..... ..i, ~II," II. ,1. 5. h. 7. .md ~I \l,'nlhly ..aliniIYlbl;lar...,hl,,,nlnhgur....1. Slreamll"" haJapnon..un,.t'Jdlt'd"n ..alinllY 1lI1h...C"I"rado RI\...r 1lI1'J<j~ :IllJ I\N5. In 1445.lht'run',n,t'a"ll\".....lal,..;m..l lugh'lrl:...ml1o... ""'prulong,'J"ell 1t1l<llh.' ..umm.'rltig,.h Slreaml!,," III\1ol~ I4<J5,,1 "II... ] "il' "nl~ 01 Pl'r,,'el!l "f lhl' It'I1~.It'nn ah'I;lgl' 11'l,;q__<l~I. hUl 'tr~;Jmtl"", [or Jun... Ihrough S,'pl,'m!x'r ",'r,'mu.;hgrl';Ut'flhan I"n~-Icml a\l'rd~"" Illg_::.. f'"rt'\Jlllple. ..lrC;II11I1"" In Jul~ 1<N5 ";1' ::"_'I"'n:t'nl ,,[ Ih.' ...1 Cfage Jul~ -tr,....m!l"... for 1'J_;q-'I~, Al ..It... ~"Ih<: ,Ire.mlti"... l,'r Jul~ "'" .W5 po:fl:cnl ollh,' .I\cragl' Jul~ 'lr~amll"" f"r l'j51-<l~ Th,' high ..tre...mtlo" illlhl' t>a~m ,....u',.U.l l.u-gl.Je.;rea.....m '''']Iml~ al ...11 'lle'llig. .') "hen c"mp"r,'J I" r'llJ~ The ..amplc,ha\lng lilrg,'''1 dllkren....e' In 'J.hml~ "Cf,' ...."lk.,:leJ In Jul~ .Inu .-\u;:u,l. ,.llml1~ "..... mu,'h fl'''er In 1<N:'i th...n in I"<J~ J.1...1I ," '11t'... Hlgh,tr";J!ll- lit'" in ]<N:" a]"'..all....d 'J.llmt~ ;1I11,'ng 'ltC' h' I'C "Imi\;t.r unlil <',.lfl~ S~rlemll.:r, "hClllhc dk...'holrunnlf....cfl'JlIlllnJ,hlng. In gl'n~ral. ...a]il1ll~ m Ih,' Cnl"f:.tJo Rl\er I' mH'r..el~ rdak'l11o ..Irc.mllll'" lhg .~I SJhml~ lenJ, ["ll.: hlghcr.ll l"" 'Ir...amlln", J.lIJI.)"er;llhlgh..trt'amll(l"', H"""'h'r.lh.' efle..:t..ol,lr"';1mllt'" nn..:.thmIY mIght Jep.:nJ It' ",>Ilk' J....gfl'l' ,'n tht' tlm,','l ~,,;u, S"hl\1l~ ".i,hlghnltnr'Ut',Jn"n..trt'amlwmlh...' Gunm...>n R"...r(..ne' h. 7. :mJ SIJunng . MONTHLV AVERAGE STREAMFlOW, WATER VEAFl1990l . MONTHLV AVERAGE STREAMFLOW, WATER VEAR t995 . AVERAGE LONG.TERM STREAMFl..OW 19J.t-94 ,\ugu,t-;";,\\cmt>.:r I'/<J~ <lig. .1). "hl..:ll i.. Ih,' bnerl1ne.haU"llh...lrrig...ll<.n....'......>nllllhl. (;raoJ \'allcy. AII,'r ....irl~ ;";,'Ienlt>.:f, lh,'r..." J.J'.(f'";I.....'In IfTlgall"nrt'tumll""".;md'ahn- ll~ .knt'a..t'J ;U"II..,t., 7" and~. rhily,[r...Mn- II"" ;lllh.' gagml,! 'ldli"""l '1lc ~ "'" lo....e..1 Illlhe ,lUJ~ f't'nllu iJul~ I''''~-St'plt'mt>t-r ]'/<151 Juring la[c Jul~ anJ ":lrl~ Augu"l I'/<l~ anJuuring Ik........ml.....r l'I'j-+-l'c!>rua~ I'''':'' llwrl'h.re.lhehlgh\;"1 'J.]11l11~...1 'll,"{'. 7.dnd '" 0" z o u ~ 16 " " . t;jl" " " u ffi12 , u ~ 10 . . o " " > . . " " . > t . z o > , , . 2 o DEe DC' '0' J^' kJIJ m'l al....a~'''':l,:urJunng tht' 11>"e'l '(fl'M11!],,>", The hlgh<'f .."hml~ III Augu'l- .\;'l\emt>.:r ]'''J~ Iw ,il," n. 7. ;mJ Il. pmh...hl~ "a' ~'au......u h~ m,.r..;J.....d ,...11 l,,,,Jing !l'lhe ri\er frum ~url;l....e anJ ,ul>..url.l.;ellTig...hnn rdum II"".. Junng I~ !all....r p;Jn of I~ Irrig...- 11L.n........">n. In n>nlra,1 In..llc..6, 7....ndK.tht' hlgh....,1 'a]lnl\~ It'r ..U," I ...nJ _1 1>,:curreJ Jm- Ing[)cl,:\;'ml'x.r-I-'....t>ruar;o....ht'll,tr...am!l"" "a, alamlnlnlum. SaJlnll~ al"lle] ...."ulJ nUll'>t: ...lll'~'ll.Jn~ lrT1gauoll..lr"'lIl;Jgc IrnI111ht'Gr...nJ \'JIl...~. ,md lh.... clk';l 1'[ Imgati"ndnllllag....at ..II,'.' "il'nunlmal Weekly Variations in Salinity and Relation to Streamflow SJ.hnll~ t"r "ed..1~ ,...mpk' n,lIe.;lcJ "I 'lIt'.. 1-5 ;u,' plolleu In llgurc ~ (jen~'r...lI~. th...r,' .....1'" p...Ju...IIn,.r....;t...... III "tlinll~ al.......;h 'lie !f<lm Jul~ I'N~ h' :\n\t'ml>t'r I't<j~..., 'u\;'amllo.... p;"ju;i1I~ J'.nt'a.....u SJhml~ f\Or "ed..I~ 'ill11plc.. ""lk,'It'J m I<N~ "..... "Imilar ;ur1<'ng 'ltC' I.~, anJ -' thg. ~l. Salmll~...l ,it.'''~ ;mJ 5 "J."':I'II'hlemly hlghnlhanal "t,', I. ~.;mJ -'....nJ ,,,linll~...1 'II....:" ....a'elm- 'I'lelll]~ hlgh,'rlh"nJ.t ,il""~ In.' Inn,.......... in ,...linll~"'1 ,u...' -'"~, and:' m;ldo"n'lf<'am dlf,'I,:U,\J1 rruhahl~ i, a re..ul1 <>! ,mb.."t' anJ ,ul>..urt'a,'t' IrrigallnnT\."IUm n"",t"lhl'ri\'t'r, I I 1 '" SEPT MAR APR MONTH "" JULY 'UG JUNE Figure 2. A~erage monthly streamflow tOI walel years 199-1 and 1995 and long.term monthly slreamllCM- for 1934--~ lor lt1e Colorado River n.ear Cameo at gaging stallOn 09095500 ISlte 1 mflg 1)