Colorado Daily: The Colorado River system — which 30 million people depend on for drinking and irrigation water — could fully deplete all of its reservoir storage by the middle of the century, a new University of Colorado study shows. Under the most drastic climate change scenario, the study shows a 50 percent chance of depletion if current management practices continue while the West warms and the Colorado River dries up. The study is published in the American Geophysical Union journal Water …