A century of water management in the western United States is on the verge of being restructured and two UC Berkeley water experts approve. Under a plan recently passed by Congress, the U.S. Secretary of the Interior is charged with implementing an agreement among seven states — Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming — in which each agrees to take less water from the Colorado River. The plan, more than two years in the making, now is headed to the desk of President Donald Trump for his signature.