After more than four years of short-term funding, a multiyear aviation bill seems to be finally on its way to passage. Senate and House leaders on Jan. 20 resolved a thorny labor issue that had blocked a multiyear authorization for Federal Aviation Administration programs, including its Airport Improvement Program, or AIP, grants, which fund runways and other projects.Those programs have been operating under a long series of stopgap bills since September 2007, when the last long-term FAA law expired. The 22nd extension is slated to lapse on Jan. 31.Some issues remain to be worked out. One item is believed to
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.