A dry April caused the expected spring-summer runoff into Lake Powell to plunge dramatically, with the water-flow forecast down the Colorado River declining as much in one month as Tucson Water ...

Her memo acknowledged that treated water entering the normally dry riverbed "will infiltrate into the sands and percolate into a porous portion of the aquifer, carrying potential contaminants." ...

But today the concrete bridge built to span the water rises over a dry ... beds and use far less water than the traditional method of flood irrigation that ceased to make sense when the river ...

† School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, U.K. ‡ Cohen Geochemistry Laboratory, School of Earth and Environment, University of Leeds, Leeds, U.K.