This week's deal on how to share the Colorado River's water relies heavily on cuts to the agricultural sector, which is responsible for 80% of the region's water use. "Water is a valuable asset, and I think people are nervous about parting with it, because it kind of suggests that you don’t really need it after all," said University of Arizona extension specialist George Frisvold, earlier this week. "I think there's real concern that this is voluntary now, but it could come back and bite you."