U.S. construction equipment exports dropped 36% during the first half of 2009, with $6.4 billion shipped to global markets compared to $10.1 billion at midyear 2008, according to the Association of Equipment Manufacturers, Milwaukee. Europe showed the largest percentage decline, with a 53% drop to $777 million in exports. Canada remained the largest market for U.S. equipment exports, but even that market was down 45% from a year ago. SOURCE: AEM. Percent change is first half of 2009 versus first half of 2008. Total represents the dollar value of all exports.
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.