Airports across the nation are cutting back on their capital programs, and the industry is anxious for a full reauthorization of a Federal Aviation Administration funding bill rather than settling for topgap extensions. Perhaps the most pressing issues of all are implementing a modern air-traffic control system (NextGen) and finding alternatives to crude-oil-based jet fuels. Catherine Lang, FAA’s acting associate administrator, told attendees of the American Association of Airport Executives that the Senate is the “wild card” in reauthorizing a four-year bill. The House Transportation and Infrastructure Committee on March 5 approved a bill that would authorize $70 billion for
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.