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<br /> <br />w <br />l\;l <br />r.::: <br />co <br /> <br /> <br />performed a computer siMUlation of the hydrolop,ic.salinity flow <br /> <br />system in the Upper Basin. <br /> <br />Differences in findings among the various studies Occurred. partic_ <br /> <br />ularly as related to quantitative displays of historic salinity con_ <br /> <br />ditions, salt loading, concentrating effects, contributions from <br /> <br />various Sources. and economic impacts. Because there was nanuni_ <br /> <br />formity in assumptions, data sets. and procedures, the quantitative <br /> <br />findings should be expected to differ. On the other hand. the COn- <br /> <br />elusions derived are generally similar. The Major sources of salin_ <br /> <br />ity were identified as arising from natural point and diffuse sources. <br /> <br />irrigation. evaporation, out-of-basin transfers. and municipal and <br /> <br />industrial uses. The largest portion of the minernl burden was found <br /> <br />to originate in the Upper Basin. The natural sources were thought to <br /> <br />be the major contributors to the salt loading. Salinity was projected <br /> <br />to continually increase in the lower reaches unless Control programs <br /> <br />are inplenented. The impact of the increasing salinity levels was <br /> <br />found to be pri~arily econonic. ~nile salinity levels increased OVer <br /> <br />time, the composition of the water with respect to individual ions <br /> <br />remained relatively stable. <br /> <br />Water Resources of the Upper Colorado Basin-Basic Data (USr.S) <br /> <br />In 1964, the U.S. Geological Survey published its report entitled <br /> <br />"1'Iater Resources of the Upper Colorado Basin-Basic nata" as <br /> <br />n <br /> <br /> <br />