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<br />Figure 1. The Colorado Alller.n Grand Canyon. Anzona
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<br />runn...'r' ....hn had 1."lxTil'rk"cd the ulIfl'!!ulal\.'d rin'f. In
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<br />n,'''~arch, \\'i.' alll'lIlph:J In (\.',,1 our ld\.',l" ahouI tht'
<br />m.:J!,'!nitudt' tll dl.mgt' \\ Hh tht' pt"llpk' \\hll t'\IX'r1t'IKt'J
<br />the- ch.lIlgt'""" Ihl."~ 1k,,'t'UlT\.'J, Our inli.'nt hnt' I" III
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<br />Important't" hI "t'Ii.'IIIi1k "-1111\\ It'd,;:I.' a/'l..lul (iranJ
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<br />PURPOSE AND SCOPE
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<br />Tilt' pUrpll"i.' of Ihi" re-pI)rt i" hI pnl\lde alli.'t'dll(al
<br />IJlhlrll1alitln on h,"ltlrkal dKII1!,'!t.'" in the- Colorado
<br />Hilt'r l'\lrridof Ihrough (iranJ r:1Il~lln, Thl"
<br />lllhlrmalinn \\ a" ohtailll'd !WIIl inlt'I"\il'\\ ~ \\ llh pt'nplt.
<br />\\hlll'\pt'rkll..:t'J (hI' Clllllradll Ri\i.'r hd"llrl' Ihl'
<br />t'tllhlru..:lmllllf Gh:n Canyon Dam, diant'" ;lI1J olhi.'r
<br />at'I'tIUI1(" tll hi"[llrical \lllllradll Ri\l'r t'\pedllltln". and
<br />"Clt'nlllk p!l"t'r\;l1llHh and Jat;l t'ollt'!."It'd hcforl'lht'
<br />;llht'nl \111.'11\ Il'tllllllt'ntal "lUdl\.''' ~'ltI\\ (lIen Camilli
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<br />di"~'u",, Ib \allll' III thl' ll1;lI1;I!,'!I'IllI'1ll nlllll' ('nhlr;ldll
<br />RI\t'r III (ir;lIld Call\llll.
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<br />Units and Nomenclature
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<br />\Vl' u"t' En!,'!h"h umb 10 Jt'''\.'n~' dl~I;lIk't.''' ;lllln~
<br />Ihl' Ct1loradtl R1\l'T in Gralld Can~\lll tJ.'"ignatt'J <I" ~
<br />I.i.'l'.~ h'lT~ III [ht' (.r;.tnJ W;\"h Clllh,lllik" (l,~'hi: "l'l.'
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<br />2 OBSERVATIONS OF ENVIRONMENTAL CHANGE IN GRANO CANYON
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