Airports will require an estimated $80.1 billion in capital projects over the next five years to upgrade and expand runways, terminals and other infrastructure, the Airports Council International-North America says in a new survey. Related Links: 2010-2011 Capital Needs Survey Report The total is substantial, but represents a 15% decline from the amount projected in ACI-NA's 2009 report, reflecting projects deferred or cancelled. In releasing the report on Feb. 23, ACI-NA President Greg Principato said that for airport officials and airport users, "These projects are considered essential...to meet forecasted passenger and cargo growth." But in a conference call with reporters,
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.