The U.S. Dept. of Transportation has sent a final notice to New Jersey, directing the state to repay $271 million in federal funds for a $9.1-billion commuter-rail tunnel project that its governor, Chris Christie, (R) canceled last October. Related Links: Blurry Tunnel Vision Huge N.J.-N.Y. Commuter Link Halted 30 Days for Cost Review The Access to the Region's Core (ARC), conceived before Christie took office in January 2010, was to be a nine-mile-long commuter rail link running under the Hudson River, from Secaucus, N.J., to midtown Manhattan. In a final decision issued on April 29, U.S. DOT's Federal Transit Administration
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.