The outlook isn’t bright for a quick deal on a new, multiyear aviation bill, because the Senate and House haven’t bridged a wide gap on funding levels for airport construction grants. They also have been unable to resolve a disagreement on a labor issue. Negotiators, led by Senate commerce committee Chairman Jay Rockefeller (D-W.Va.) and House Transportation and Infrastructure Committee Chairman John Mica (R-Fla.), have been working to settle differences between the long-term Federal Aviation Administration authorizations the two chambers passed this year. But with no agreement yet in sight, lawmakers cleared another short-term extension to keep Airport Improvement Program
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.