Five contractors have submitted proposals to build the $523-million National Bio- and Agro-Defense Facility at Kansas State University in Manhattan, project sources confirm. Construction of the megalab, to be the center of U.S. anti-bioterror and agricultural defense research, is being managed by the U.S. Dept. of Homeland Security. It will replace the 50-plus-year-old Plum Island Animal Disease Center in New York state and is being designed by a Perkins & Will-led team. DHS would not disclose details of the ongoing procurement, but according to company executives, those who submitted proposals earlier this month to build the facility include: a joint
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.