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<br />.... <br />0> <br />U' <br /> <br />i :; <br /> <br />EXTENSIO~ or STREA'1FLO\.' A\D DISSOLVED-SOLIDS RECORDS ,\T SELECTED SITES <br />1\ THE COLORADO RI\r:R BAS 1)1; , ARIZ01"A, CALlFOR\IA. COLORADO, \EV,\DA. <br />NE\..' ~IEXICO, UTAH, A.,'-;D \.;Ymll~G. 19~O-81 <br /> <br />By David K ~lueller and Timothy D. Liehermann <br /> <br />ABSTRt\CT <br /> <br />tlonlhly streamflo... .Hld dissolved-solids com-enlrdtion ""ere estim,lled for <br />periods prior to thv illiti3tion of dal~ ~ollectioll at selected silPS In the <br />Colora.do River basin. Technif}ut's used for this cpt'ncd f'xlension lncluded <br />simple and ....eighted leilst-squares ct'.'!.n'ssion. Slreamflo...' rl"conls ....ere ex- <br />Lpoded at 5 sites anll dissolved-solids records ...ere extended at 13 sites. <br />Rpcords ""ere eXlend<-'d from October 1940 through the beginning of the period <br />of rf"conl dt edch site to providt' .J completely f'OIH:Urrent data set for all <br />sitt's. Standard errors ""f're 5 to 74 percent lor monthly streamflo.... and. 3 to <br />27 percent for monthly, flo....-...'C'ighted rlissolved-solids concentration. The <br />extended records at all sites ~ere consislent with records from the historical <br />period. <br /> <br />INTRODUCTIO!'-i <br /> <br />Monthly streamflo~ Jlld dissolvp,l-sollds data for 20 sites in the Colorado <br />River basin (fiR. 1) are compiled and published biennially by tht' U.S. Bureau <br />of Reclamation as pdrt of J report from the Serret,sry of the Interior to <br />COllRress on the qu,llity of ....,-1ter in the basin. These reports are mandated by <br />several Federal 1.1""5, including the Colorado River Storage Project Act <br />(Pi 84-485) and the Color.ldo Riv~r Salinity Control Act (PI. 93-320). Data <br />used to compute tbe monthly v,llues are obtained from U.S. GeologIcal Survey <br />streamflo""-gaging and ....aler-quality 5amplinR sLltions located at each of the <br />20 sites (table 1). The monthly values in the biennial reports are tabulated <br />beginninR ...ith January 1941. For the 12th biennial rt'port (U.S. Department of <br />the Interior. 1985). monthly values ....ere recomput('d for the period of record <br />at each site using d method developed by Liebermann ,HId others (1987). Values <br />could not be computed for all months for 13 of the sites because data col- <br />lection began after 1941. :1issing monthly values ....ere replaced by undocu- <br />mented estimates from previous biennial reports. For the 13th biennial <br />report, the U.S. Bureau of Reclamation desirt'd estimates that ....ere derived <br />using standard techniques and "'-en' more consistent \"ith v,llues computed for <br />the historical period of record. <br />