Photo courtesy of USACE As the Mississippi River swelled to dangerous levels last spring, the U.S. Army Corps of Engineers prepared to open floodways by blowing levees. Nervous populations downstream craved information about the actions and consequences. By launching a Facebook page, the Corps found it could quickly deliver critical information on the unfolding situation to the people who needed it most. The response was enormous. Photo courtesy of USACE Last spring, faced with the need to disseminate quickly updates and information to an affected constituency about the probable need to blow a levee to relieve flood pressures, the Corps
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.