Montgomery County, Md. The Silver Spring, Md. transit center as it appeared in April 2011. Team members building the Silver Spring Transit Center, a major mass transportation hub in the heart of Silver Spring, Md., a Washington, D.C., suburb, continue to point fingers at each other as the project remains in limbo.Project contractor Foulger-Pratt, Rockville, Md., has filed numerous notices of claims against Montgomery County, the owner, for unnecessarily delaying the project.The most recent of those, filed on Jan. 18, contends that the county owes the contractors $7,525 per day if the project continues to be delayed after Feb. 26.
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.