The U.S. Navy released on Sept. 21 its final environmental report on impacts and mitigation measures of a planned buildup of facilities and infrastructure on the Pacific island of Guam that could cost more than $15 billion. The work will enable the transfer of thousands of U.S. Marines and dependents to the island by 2016. Release of the “record of decision” allows construction and personnel relocation to begin now, says the Navy. It follows a mammoth environmental review, one of the largest ever undertaken for a federal project, say Navy officials. However, the Navy will defer its decision to build
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.