Companies came out in force March 24 to a U.S. Army Corps of Engineers briefing in New Orleans to pick up details—and size up the competition—on a planned $800-million, design-build contract for permanent closures and pumps at the city’s three outfall canals to better control potential hurricane flooding damage. + Image Image: U.S. Army Corps of Engineers The Corps is allowing flexibility for design-build contractors to propose their own pump configuration. About 100 people representing dozens of contracting firms attended the Corps briefing, but few questions were asked as the companies appeared to want to hold any competitive advantages close
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.