The San Diego County Water Authority extended by 10 years a multibillion-dollar deal it has to buy water from the Imperial Irrigation District. That deal remains the largest water purchase of its kind in the United States. The Water Authority began talking about the deal in 1995, shortly after a major drought hit the state. The Water Authority pays Imperial County farmers to stop using some of the Colorado River water they have rights to and, in turn, San Diego gets long-term access to enough water for roughly 1.6 million city folk.