See journals under US Geological survey. Prof. paper 1401-A.

Not only are these water supplies not depleted, they are in fact relatively healthy despite California's recent six-year drought.

"Illuminating." --New York Times WIRED's Required Science Reading 2016 When we think of water in the West, we think of conflict and crisis. Yet despite decades of headlines warning of mega-droughts, the death of agriculture, and the collapse of cities, the Colorado River basin has thrived in the face of water scarcity. John Fleck shows how western communities, whether farmers and city-dwellers or U.S. environmentalists and Mexican water managers, actually have a promising record of conservation and cooperation. Rather than perpetuate the myth "Whiskey's for drinkin', water's for fightin' over," Fleck urges readers to embrace a new, more optimistic narrative--a future where the Colorado continues to flow.