After a delay of more than seven months, a two-year, $34.6-billion Federal Aviation Administration reauthorization finally has made it to the Senate floor. For construction, the bill’s key item is the $8.1 billion it would provide for Airport Improvement Program (AIP) grants, which finance runway work and other infrastructure projects. Of the bill’s $8.1 billion, $4 billion would be for 2010 and $4.1 billion would be for 2011. Funds would be subject to annual appropriations. This year’s AIP appropriation is $3.5 billion. If the Senate passes the bill, the next step would be a conference with the House, which approved
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.