Airport construction grants will flow through July 3 under a Federal Aviation Administration extension enacted on April 30. It is the 13th stopgap since September 2007, when the last multiyear FAA bill lapsed. The House and Senate have passed new, differing long-term bills. One difference concerns passenger facility charges (PFCs): The House hikes the PFC cap to $7 from $4.50. The Senate keeps the $4.50 cap, except at six airports, which would have no limit.
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.