Although there has been action in the House on a four-year Federal Aviation Administration reauthorization bill, it is likely that Congress instead will approve another in a series of extensions when the current stopgap FAA measure lapses on March 31. Source: Airports Council International-North America House Transportation and Infrastructure Committee Chairman James Oberstar (D-Minn.) says it appears a six-month extension is needed to give the Senate time to work on the bill, says transportation panel spokesman Jim Berard. Such a bill would keep FAA running and its Airport Improvement Program construction grants flowing through Sept. 30, when fiscal 2009 ends.
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.