If the definition of insanity is making the same mistakes over and over, then many cities have taken a certifiable approach to securing their water supplies — and they need some radical therapy before taking the big economic, ecological and human hits that come with a permanent state of thirst. That’s the conclusion from a new study in the journal Water Policy, whose authors compared the water supply histories of four cities. The time to act is now, argues Brian Richter, a senior freshwater scientist at The Nature Conservancy, U.Va. adjunct faculty member and the stu...