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<br />
<br />BA3IC STUDIES
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<br />Quality data for ~he period January 1941 to 194~ ~er' cbtained from
<br />the U,S, Department of Agri;:ult:'lre salir:i~.: laborCi":.or:;' a't Riverside, Cali-
<br />fornia, and 'he remainder, l~4j ~o 1~66, ~ere ob-aineJ from U,S. Geolog-
<br />ical Survey Wa~er Supply Papers and provisional records and are based on
<br />data for the Yuma MAin Canal belc~ ":.he Colorado River siphon (Table No. 18),
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<br />C. AnalysE:s
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<br />Published quali';y of water re'..::ord", consL + of a combination of stream
<br />discharges yith chemi:e.l analyses of stream ~h":.er samples collec":.ed at more
<br />or less regular intervals, Toe rtliability of the records depends on the
<br />accuracy of the :-;tr'~aml'lo"'" recocd1, i.h^.:. frf'querH':Y of~olle(:t.ion and repre-
<br />sentati veness of th' zamples, the 5tsb ili '-,y of 'he- ',ropIer during the stor-
<br />age periods prior ~.o t.he making of ',he aoalT ~S. 1'1' .'0~pletene3s and ac-
<br />cura.cy of the indi vi ..iuo.! annlys,.s, Cind '!"ot:' ,:1: r" 1:, ...:hi -.:h -:::.he individual
<br />samples are combined lei'o!"c an(!.l::'~:3 ~ r~p 'St ' i!<~ ~!:lellts of stream
<br />discharge.
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<br />t.fost of th( ~ater ar,al?de<: :'ormin,t h. b'l.: i dav1 for th~ chemi-..:al
<br />records in this repor- yere made in ,_he latJOI'a'.(,ri ~2 of the G'~ological
<br />Survey at Washington, D.C" Albuquerqu'~, Ne'W !'lexi,:C" and Salt Lake City,
<br />Utah, using standard proc~~dures, by .~h",mis1.~~ '~'P"~ Lfi ';fIl1y t.rained in 'Water
<br />analysis. During th(: 'b-Yf:'sr pt"rioc.:on:,i'ier+~d 'h:r- '.Iere numerous changes
<br />in laboratory technique::; and procedures. mos+ly rIcH .-,0 introduction of' ne..
<br />instrilmental methods, Ne'W procedures ',len' adopt. d only aft..er careful in-
<br />vestigation t.o inst;n results ':or:s. tent wi'h :,no;" ob'.ained previously.
<br />Some of the qualit;r of ...-at,,!, re-'ords arc based on analysis of samples by
<br />Bureau of Reclamation laboraLories. BU"r""lll 01' HE'::lalNi~ion results and
<br />methods have been chf'cked by T.ne (',(:ol";--::i,~al 3urv'::y . <) insure comparable
<br />records. Analyses by t.ht, Met J'opol U:ln -',0.'0 ',.-. r Dis' ri ~t hS'IE: been lIl8de by
<br />standardi zed procedures 'lnd "'pp"nr ~.o b, ::+or:!pfl.!'rtLl'- ...'1' h analyses by the
<br />Geological Survey. I"' 1. probatl, rtls I','ort' in ~he load computations
<br />due to errors in the llnalyse::: r~r<, ll?s 'hose du( '.0 changes in the
<br />samples upon st,orag,:, inar.:_~'l.ra'~'ie~ it, ;Bn,P ;t:i, or nacclll'Hcies in the
<br />de~ermi!1ation of stream dh:'herg.
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<br />D, Studl.eJ or ," r"t'Oiit': Ar"'J.;
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<br />Special quality of .,oa+er- -'-l<.1~"3 h's'H beer. m&de In a number of irri-
<br />gated areas to deter:nine ::>":ornrf' a:~d i:rrle,-a'ir "f :'.$ on .".a~er qualit.y,
<br />Surf Lien: qua1i '-y de".a ha,..e l,- : '1___ ~.,. ~d ty 'ro. Bureau of Reclamation
<br />in !.yo of +hese a !'eas ._0 indic:a' '" . J'ends.
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<br />1. Eden Projec~
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<br />Quali ty of ....at:er data wen: ~oLec' d in l,",t Eden projec' area before
<br />the Colorado River S~_orage ProJe(" ....~' ...&: po. '-J b 1 ~56, Datn are
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