A final regulation implementing a February 2009 executive order encouraging project labor agreements on big federal construction jobs drew criticism and praise. The Associated Builders and Contractors says the rule exceeds statutory authority, but the AFL-CIO Building and Construction Trades Dept. supports the regulation. The rule, published on April 13, doesn’t mandate PLAs but encourages agencies to consider them on projects of $25 million or more.
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.