At a time when many of the media images from the Middle East show turmoil, we thought we would show you a video of a signing ceremony at the Business and Investment in Qatar Forum, held April 6-7 in New York City. Executives of Parsons Corp. and AECOM inked infrastructure development deals, and the atmosphere, like the sound track of the video, was steady and upbeat. Transportation Secretary Ray LaHood said the contracts announced that day were not just big deals but good deals. We think ENR.com's video channels are also a good deal, providing 250 free video reports on
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.