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<br />26
<br />
<br />CLARKSON ET AL.
<br />
<br />80000
<br />_ 70000
<br />en
<br />'ti 80000
<br />........
<br />CIl 50000
<br />C7'I
<br />6 40000
<br />.s::
<br />~ 30000
<br />o 20000
<br />10000
<br />o
<br />
<br />1800
<br />1600
<br />-
<br />.!! 1400 .
<br />u
<br />'.........,200
<br />. .8.,000
<br />'"
<br />"g 800
<br />.., -- g ;800
<br />---, 0 400
<br />200
<br />o
<br />
<br />,...'t;
<br />
<br />~:-;-~:' ,'":,: '-::
<br />
<br />:~. .
<br />
<br />.-220
<br />200
<br />180_
<br />160
<br />140
<br />120
<br />100
<br />80
<br />60
<br />40
<br />20
<br />o
<br />
<br />--...........
<br />en
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<br />u
<br />. ""'-".:
<br />
<br />.-....~. -' -
<br />-,<,.,,: ,2-
<br />CI
<br />.s::
<br />u
<br />en
<br />C5
<br />
<br />Colorado River
<br />above Bright Angel Creek
<br />1942-1982
<br />
<br />J
<br />
<br />
<br />
<br />Oct Nov Dee Jon. Feb Mor Apr May. Jun Jul Auo; Sep
<br />
<br />Little Colorado River.
<br />at Cameron .
<br />1947-1989 ..'-
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<br />'~>_Jr_ j
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<br />^,- ....
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<br />. .-.... '.."
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<br />- ..1
<br />
<br />~('.
<br />
<br />
<br />, Oct. Nov o.c'Jon Feb Mar ..AF~uOy Jun- 'Jul Aug S4ip~;--'"
<br />.,. - '... . '. "} ~)"-,:':. : .~~_! ~'::,.i '-' ":...- ~.;:. _'/'. ',;.l.:~ -"-:-.-','." .:"
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<br />Pari~~R!ver:' ;c' _.' '.-:-<;f ~
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<br />", ".,...:
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<br />::~ ~-':-
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<br />.., '-'
<br />
<br />",,-'ft
<br />
<br />at Lee'. Ferry
<br />, .tSl...27')9~2.'
<br />. - '. :..;; _,' " '-~. I.
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<br />. :.,r':.:]1:.
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<br />.'
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<br />....? -;,
<br />iw-/'...:
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<br />..,:.: ;.~,..
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<br />
<br />Oct Nov Dee Jon Feb Mor Apr May Jun Jul Aug Sep
<br />
<br />,
<br />.
<br />
<br />FIGURE 1. Mean daily water discharges (open bars) of the pre-dam ColoradoRivernear
<br />. Phantom Ranch, Little CoIorado River near Cameron, and Paria Rivet. at Lee's Ferry,
<br />Arizona, based on U.S. Geological Survey gauge station records. Vertical brackets represent
<br />:I:: 1 standard deviation of the monthly m~
<br />
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