In this April 16, 2013, file photo, a "bathtub ring" shows the high water mark on Lake Mead near Boulder City, Nev. Tension among U.S. states that rely on the Colorado River escalated into a public feud when an Arizona water provider was accused of manipulating the level of Lake Mead amid a prolonged drought, threatening supplies for 40 million people in two countries. (AP Photo/Julie Jacobson, File)
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