The U.S. construction market remains mired in a recession, with few, if any, markets spared. In 2009, design firms looked for a turnaround this year, but so far there has been little relief. Industry companies now await a bounce back in 2011. However, leaders of the largest U.S. design firms, those on the cutting edge of any recovery, say there still are too many economic, political and financial uncertainties to predict when the marketplace will turn a corner.
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.