Scheduled water deliveries from the Colorado River will be short 60% to 90% of the time by mid-century if human-caused climate change continues to reduce precipitation in the basin, say state researchers at Scripps Institution of Oceanography at the University of California, San Diego. “The situation is horrible,” says Tim Barnett, Scripps research marine physicist. “We’re using all the water that is there, and there is going to be less of it.” Coincidentally, on May 15, scientists at the National Center for Atmospheric Research (NCAR), Boulder, Colo., will publish a report with similar findings from a study of major rivers
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.