Airport construction would get a boost under the two-year Federal Aviation Administration reauthorization bill the Senate approved on Feb. 17. The legislation, introduced by commerce committee Chairman Jay Rockefeller (D-W.Va.), would hike funding for Airport Improvement Program (AIP) construction grants, to $4 billion in the bill’s first year and $4.1 billion in the bill’s second year from the current $3.5 billion. But industry officials worry the Senate numbers will not hold. A four-year bill making its way through the House of Representatives would trim AIP to $3.1 billion in fiscal 2011 and to $3 billion in 2012 and 2013. The
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.