Glimmers of hope have emerged for a Senate-House agreement on a long-term aviation bill before the lame-duck session ends, but a tight schedule and other hurdles may prove too hard to overcome. If there is no deal on a multiyear measure, yet another extension would be needed. At stake for construction are new authorization levels for FAA’s Airport Improvement Program infrastructure grants and maybe an increase in the $4.50 cap on passenger facility charges (PFCs), which fund airport projects. FAA estimates that 2010 PFC collections will be slightly less than $2.8 billion. There have been promising signs about the FAA
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.