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<br />Grand Canyon Monitoring & Research Center
<br />The Integrated Water Quality Program Annual Report
<br />
<br />September 2000
<br />Water Year 2000
<br />
<br />Susan Hueftle
<br />
<br />Results of Lake Powell.Tailwater monitoring:
<br />
<br />The Hydrograph:
<br />
<br />TIlt' All~US( walt"f quality mOlllt()tin~ trip fotlnn llw
<br />rt'"st'rYolr at a slt'ady t'1t'valion of :J6HO :!: O. I ft 11 121
<br />mI. '1w hydroc:raph rt'llt'cls llu- droll~hl condition,.;
<br />thaI pt"n'<lrlt'd Iht' Colorado rivt'r hasUl for wall"r )'t'ar
<br />2000 (W)"OO.O('1. HNY-St.pt. 2000). Hv s...plt'mlwL tIlt"
<br />hasin was slil] H3% of nonnal precipitallon. Lolk.. Pow-
<br />1:'1] IIltlows lulalt'i-J H.I:\-I..t2:\ <If Of ahout 71% 01 nam-
<br />,'ra a\'t'ra~t". whiJt:o rt"lt'ast's totaled 9.371:1.000 af or
<br />ahoul ~6% 01 post dam n"[t'ast's (USUI{ fl~'drom...1 dara-
<br />hasd.
<br />Typit'allv ltw spring innow ht'J!ins In Ft'hrl1ary and
<br />pt"aks in t"adv Junt". Thb vt"ar inllnws cHdn.[ in(Tt"aSol'
<br />. .
<br />si~nifkan[ly Ul1Ii1 :\lay and tilt" hi-modal pt-'ak was Oil
<br />....1ay 12"' and Junt' :\,,j (:\0.600 c{s and 40,600 ds. rt"-
<br />spt"niv..lv. fj~llrt' 1).
<br />
<br />The Profiles:
<br />Fj~urt" 2 prrJ\1d,'s olit'nlation lor SOtllt" 01 Ih,' [t'rmi-
<br />nol(J~. .1Ilrl I!t'nt"ral ehanu.h'lislks of tIlt" rt",>t'r\'01r.
<br />'111t"r.., <uul in [hI' main ch<Uln..l Isoplt'lhs for the n's,'r-
<br />voir lfi~un' :\!. tlw d1..c[ 01 tilt" rit'prt'ss.'(l inllows is ap-
<br />pan-'llt. -nlt"S" prr1l11t"s dt"lIIons[r.l(t. physi<'aJ eOlulililllls
<br />1l('mpl'raIlJr... <,onchwllvllv (or ..allnltyl, pI!. t"t('.J alonl!
<br />1110' Ihalwt'1! of [Ilt" Culorado riw'r in Ih,' n'st'rvoir. TIll"
<br />dim..nslolls of tht' "'prin~ !lu'KI phllllt", as ohst"rv..d hv
<br />th.. fn'stwr watt"r t'xlt"lldin~ ,lITO"S th.. top of tht' lak!"
<br />Wes. :k ,<1.1 :_1<11 in [ht' COlllhH'UViIY plols. is I..s.. O;"XI,'n-
<br />sivt' Ihan in IMsI yo'iUS whidl had ~n'alt'r mllow. f'~\lr'
<br />tht'r. IIH' sp,'rille- ('onduclanct' of lilt" haso' lTltlow lwar
<br />Ifilt" Marina was ovt'r 1100 ~6, as oppost"d In th.. low of
<br />.170 ~6 al Ilw po'ak of Illl' ..prin.!.: nlllolT I:asl ....1av '00, B.v
<br />('onlrasl. :\tayor I!I<J7. r..n..t'ling (lIlt" of lilt" hlI!IW"i1 in-
<br />now v..ar... in Ih.. last 1.1 year"i, harl a millirnum ('011-
<br />dU("I.UIl"" III :\56 ~6, .md tht" fall 01 thai ,v,'ar had a
<br />I11.D;iillurn inllow ('Olllhll'lillll'(" of 960 p..">. 111t' condul'-
<br />lalll'e 01 lilt-' mllaw IS dil'lal,'d hy tIll" volul1w of nnmll
<br />{'"olllhin....1 wilh otJlt"r "it"asonal chararlt"ris[i('s lndlldilll!
<br />
<br />irri~ati/)n nmolT ,lIld ternprralllre. ulOl:!-It"nn trrnd!>
<br />lH'ar lIlt." dam ar.. ckmonstral....1 In figun'-I.
<br />\\'inler llllXIll~ elron' tht' IIu-nl1u'/ dlt"mo-dln.. (ZOllO'...
<br />of st....p..SI ch.lnl!t'" ~radit-ntJ 10 tJw d..plh of the pt"n-
<br />,.,t(K'k... (-50-60 m lrom llw bk..'s surf.U'..t in January,
<br />By Ih.. p...1k 01 sumnlt'r wamlin~ ill Alll.':usl. Ihe upp..r
<br />houndary oltt1<' tho,'nnudint' s[arl..d at 10-12 m and
<br />..xtrnd..d In [h.. dt'plh of :\0,.10 III Ihrolll!hout Ihe lakt"
<br />lfi.gures 2, 3a-:wl, ,II. B,'('auSt-' 01 the r..dlJ(.t"d innow vol-
<br />IJillt', Ihis Yt".I(.. (lwnlHlC'lin.. Is shallm".....r Ihan in re'
<br />r,'fl( .vt"ars' (f1~,.I}.
<br />
<br />Fl~l1r.. 2: T"lII~'r.lllln' pmlll., {or th.. m.lln ,-hann('"1 of I~"lk('"
<br />1'01',1'"11, All~_ .00. lududln!.: ""mlt' t,'mlln(JIo~.
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<br />~ 7S 100 125 1~ 175 100 m lSO 27S
<br />KllarnPlfonltomGlefoc..,onClam ~
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<br />Lakt'-\l,icl.. lhs..ol\".-d oXVJ::..n nllll..rll i... dt'"(Tt'"asing af-
<br />It'r last "Ptilll(" l"k"'w1d,' t"1ll1ehnwllI which rracht-d a
<br />] 5 yrar hi!!t\. 11110,; W,IS a n'sull of 2 proet"ssc's ]a"l
<br />spril'll! ilnd l.I.illtrr. For lilt' 2"'1 1'1IIl",,'('uli\'t' I.I.'tlllrr L.akr
<br />!'owO'Il t"xpt-rit"m'..d alaI.. wllllt'r 'lxYl!rnal{"d unrlt"rllnw
<br />plulIlt' lt1r,:urt"s ~~.l<kL As a n'suh lit' hiL(h inl1ow.. sinct'"
<br />]9<1:1 ane! conlinllin~ dilllllnll .,f ("...rall ion C"ollC"("ntra-
<br />lions, lh.. rlellsll\' I!rad1r'nl 'io'p.lrating Ih.. rpilimnlon
<br />from Ill<' h\"J>olinmioll has wt"ilk"lwd, ;Jl1owjn~ tht'
<br />p"lwlra[ioll of ('old. wt"II.(n:\"I1.t"II<l[t'd walt"r intn Illt"
<br />lit"!'p"sl !a\.tTS 01 tht' lake. 11us pnK."sS was siL(nHl-
<br />canlt\" t"nhillll''''' tw 11ll" us.. "f tIlt' WI-Iul"-",, in 19!-Hi for
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<br />Fl!.:lu..' I. Ih.,lr<ll.:r.lph felr lAlkc 1',,\\,1'11 ..1"\,1(1011, mil,,\\." and oUlIl,,\\." lor n. I I 19<-f!j In s,'pt"Jllh.'r :lO. 20lKl
<br />
<br />k 1128
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<br />././ \-Avg Inflow 1127
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<br />/Innow \ 1126
<br />- Lake stage // \ f: 1125
<br />j ~ / _\--\\'YOO,. 1124
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<br />~~""L" .. n / '. 1123
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<br />,,- ........~._.. . ----:. 1122
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<br />.,' .1 '1 1120
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