The deaths of firefighters Joseph P. Graffagnino and Robert Beddia at the Deutsche Bank building at Ground Zero in 2007 needlessly replayed in miniature the tragedy that unfolded on Sept. 11, 2001, when 343 of New York's Bravest died. The high-rise bank building, adjacent to the World Trade Center, was damaged in the attack and, six years later, was being cleaned of asbestos and demolished. State Supreme Court Judge Rena Uviller and a jury in Manhattan now are deciding whether to convict three contractor site supervisors as well as subcontracting firm John Galt Corp. on criminal charges in connection with
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.