Senate floor debate on an $848- billion health-care measure is poised to start. The chamber on Nov. 21 voted 60-39 to take up the bill, the minimum margin needed. The measure builds on packages cleared by two committees and contains a public insurance option, which many moderate lawmakers oppose. Labor unions support the Senate bill, but several construction groups and most GOP legislators oppose it. The House passed its version on Nov. 7.
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.