National Public Radio: The City of Thornton is one of many growing suburbs of Denver, Colo. On a day without much traffic, it's only a 20-minute commute into the state capitol, and its new homes with big yards make it an attractive bedroom community. Nearly 130,000 people live there, and the population is expected to keep booming.
All that big growth comes with a big need for water. In the 1980s, Thornton placed its hopes in the Two Forks Dam project, which would have provided the city with enough water well into the...