Construction and engineering companies--and individual workers on jobsites or in offices--would benefit from the "framework" of an agreement between President Obama and congressional Republicans on a package of new tax breaks and two-year extensions of current rates and other incentives. White House photo by Pete Souza Obama announces outline of deal with Republicans on taxes The framework deal, which Obama announced on Dec. 6, next goes to Congress. Key Democrats there appear not to be on board yet. Leading Republicans' initial reactions were positive. Lawmakers must take action by Dec. 31, when many of the tax provisions at issue are
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.