Related Links: National September 11 Memorial & Museum After a prolonged fight, the National September 11 Memorial & Museum foundation and the Port Authority of New York & New Jersey have settled financial and other differences regarding the subgrade museum at the World Trade Center. The dispute halted museum construction last December, cast a shadow on the two entities leading the project and delayed the scheduled Sept. 11, 2012, opening by about a year.The seven-level museum and some port-authority projects share infrastructure at the 16-acre site in Lower Manhattan (ENR 8/16/11 p. 34). The authority, which owns the land, had
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.