The U.S. Dept. of Homeland Security’s decision to site in Kansas the much-coveted National Bio and Agro-Defense Facility, with an estimated $500-million construction cost, drew protests from students at nearby Kansas State University in Manhattan, but the project’s final design is set to begin this year. The facility, to be the center of U.S. infectious disease research, will replace an aging facility in New York. Six states competed for the megalab, which could generate 1,500 construction jobs. Burns & McDonnell, Kansas City, Mo., handled conceptual design as part of the Kansas bid. Photo: AP/Wideworld
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.