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<br />B <br /> <br /> <br />(.j,) <br />f\) <br />c.o <br />00 . performed a computer simulation of the hydrologic-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 nonuni- <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 />clusions 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 mineral 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 lIDless control programs <br /> <br />are implemented. The impact of the increasing salinity levels was <br /> <br />found to be primarily economic. While 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 (USGS) <br /> <br />In 1964, the U.S. Geological Survey published its report entitled <br /> <br />"Water Resources of the Upper Colorado Basin-Basic Data" as <br />