In Yuma, Arizona, the Colorado River is not what it was. For thousands of years, its raging water deposited rich soil in the delta, creating one of the most verdant agricultural areas in the world. Today, the river flow is 1 percent of what it was a century ago, but agriculture continues to thrive even as the water needed to maintain it dwindles due to over-allocation and drought. How does the area’s No. 1 user of the Colorado River water survive in the face of a vanishing water supply? The answer: technology.