The House has approved a $53.5-billion measure to fund Federal Aviation Administration programs for the next three years, including an increase for airport construction grants and a hike in airport passenger facility charges (PFCs), which finance infrastructure work. But prospects for final congressional approval rest with the Senate, where a multi-year FAA bill has yet to emerge. Photo: Aileen Cho for ENR Funding levels are uncertain for airports, like this one, now completed, in North Carolina. The last multi-year FAA measure lapsed last Sept. 30. But with a successor bill bogged down in the Senate, FAA programs have been operating
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.