Despite progress in Congress on a multiyear aviation measure, it looks like another extension—the 12th since 2007—is on its way for Federal Aviation Administration programs, including airport construction grants. The Senate on March 22 approved a two-year, $35-billion FAA authorization by a 93-0 vote. Todd Hauptli, American Association of Airport Executives’ senior executive vice president, says, “Passage of the Senate bill is an important step in the legislative process [and] overdue.” The aviation bill next must be reconciled with a three-year, $53.5-billion measure the House passed last May. There’s no dispute about the funding for FAA Airport Improvement Program (AIP)
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.