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<br />THE PROBLEM <br /> <br />07 <br />;;; <br /> <br />o/.>g ~ <br />let <br /> <br />..... <br />(.1' <br />00 <br />00 <br /> <br />The Colorado River Basin encompasses portions of seven <br /> <br />states. The river flows over 1,400 miles from its <br /> <br />headwaters in Colorado, joins with tributaries from <br /> <br />Wyoming, Utah, and New Mexico, and flows through the Grand <br /> <br />Canyon. <br /> <br />It provides state boundaries for Nevada, Arizona, <br /> <br />and California, and terminates in the Gulf of California in <br /> <br />the Republic of Mexico. <br /> <br />Use of the river's water now and in future years has been <br /> <br />fully allocated through a long history of appropriations <br /> <br />and negotiations that include compacts, litigation, <br /> <br />legislation, and an international treaty, <br /> <br />About half of the present salinity concentration in the <br /> <br />Colorado River at Hoover Dam near Las Vegas is attributed <br /> <br />to natural sources. <br /> <br />The remaining half is man-induced as <br /> <br />indicated in the chart. <br /> <br />Source Chart <br /> <br />High salinity concentrations result from two general <br /> <br />processes: <br /> <br />salt loading and salt concentration. <br /> <br />Salt <br /> <br />loading increases the amount of salt added to a given <br /> <br />amount of water, and salt concentration decreases the <br />