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<br /> 5 ExplanallOll
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<br /> Oct. Nov. Dec. Jan. Feb Mar. Apr. May June July Aug. Sept.
<br /> 1939 water year
<br /> 4 Explanation
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<br /> Oct. Nov. Dec. Jan. Feb. Mar. Apr May June July Aug Sept.
<br /> 1973 water year
<br /> Figure 3 Pre. and pOSHmpoundment patterns of discharge In the Colorado River
<br /> mainstream In Grand Canyon, downstream Irom Glen Canyon Dam.
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<br />tributary w the Ctl[l'faJo (Ft~. ]"l, OTlpn.w..s In
<br />hi~h].lnds of ArlzonJ ;\nJ :-':e\, .\tt'Xllll. The Rio
<br />Y J.qUl In ~tcXlCn slmd.\rJr r.ISSt.~ t'rtlrn the nlHth,,:rn
<br />SierrJ :-.t.ldrt" O..:uJeflt.l] dlrou,ch Iwe Jt'H'rt [nw].lnds
<br />CO rhe sed
<br />These f1Hr:> wert.: ChMJUeflzeJ r.~' rcmJ.rkJble
<br />V;\rJ.ltH1n In Jls(h.H~t' IFi!= ;l. FlunJs fwm spnn,l.:
<br />snowmelt in rhe n(Hth .lnd both dunn~ rt'gllln.ll
<br />Winter r;lln~ .lnJ late surnmt"f ml)n..non~ In tht'
<br />sourh. He rdlnwl.J by mere rrl(kks unJer rht-
<br />lntense e\',Lrllr,HlIln ,IOJ mlnlmal preClf'I[,ltlOn
<br />dunn.: earh' summer anJ aurumn Jroul.:h(~. Down-
<br />cunmF of ~anyons .lnci tr.IOSp\lrr pf rn:~l'nJllu~
<br />nllumes of ~t'dlments. Jrt' the rule. CanYI'ns. .lltl-rn.HC:
<br />WLth rt'Mht's tlt)wln.l= thrllu~h bro.ldc:r 11\loJplalOs,
<br />,lnci JJ\'ersity IS hlt:h (Fl~. -h \\'hen' tlooJpl.llns Me
<br />wlJe, t:allcry (orc:s.s ,IOJ \\'<mdl.JnJs of (ll(WnwnoJ_
<br />Wllh)\\" and 11t!u-r .ret's I'Mmerly Imt'J desert
<br />watercourses: extenSI\'e marsht,s lKlUr1t"d rht'lr
<br />backwater.. \Vart'r tables were only .1 fe\\' ft-t,t
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<br />hene.Hh the SUrt"J.(I' 10 e\'en rhe dnest desert b.lsms,
<br />and ~cera,ce m,lJnt,lLm-d rt\Trs, or .It ICJ.st filled pools
<br />Ln prort'ned (.10\'005 Jurm~ m,l]or drout:hts
<br />The sltU,ltwn (han~ed Jr;tmafll.llly wLth
<br />Intt'rn-mion tit' tct:hnolo.cllal bum.lns, -"ow, tlllods
<br />.dternatlnf, with Imc:rmmt'n(y m Jrout:h. ,1ft: an
<br />t'X(<"!:>(wn rJ.ht'r tban tht, rule lFlf,:. 51. RI\'ers are
<br />d,lmmeJ he fore rhey 1t'.I\"!: the: mountains. Flood
<br />W,lters JnJ H'Jiml;'nts are cluf:hr Ln rt'S{'r\'OIfS, .lnd
<br />\\,lH'r IS relt-J.~e:d J.s neeJe,1 lor Irrtt:JUl1n, rower
<br />f.cnerJthln, ,IOJ dllffie:StJl USI;'. Lo\\ tlow OCl:urs wht:n
<br />hum.lns det-m l! so: d,lms l,ln roe dosed <lnd ri\'ers
<br />turned oft' Ilke .l kltlhen r,lP.
<br />rM more surf.lce W;Ht'r t'Xhrs raJay than before,
<br />b>ut It IS In qUIet rl'Ser\'Olrs mHkcJly .:hlferent from
<br />dl(' onpnally turbulent streams lFi,e )) CJndls
<br />msrC.lJ ~)( sttt'.lms, hned WIth (()Onere ,lOd (holLn-hnk
<br />fcott' r.uht'r th.ln rLf'JrIJ.n trees, desct'nd lrom
<br />rl-st:r\'Olr~ w ,lnJ thmugh the lllwl,lnds (FIg. 61-
<br />~tdlm('nt ortlt'J downsrre.lm III tllhld IS nIl ]on~er
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<br />0108!
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