Congressional and industry opposition is mounting to an Obama administration plan to use some Harbor Maintenance Trust Fund money for purposes other than dredging ports and harbors, its sole use now. At an April 13 hearing before the Senate appropriations energy and water development subcommittee, the Army's assistant secretary for civil works, Jo-Ellen Darcy, said the administration plans to develop a bill in the coming months that would allow the trust fund to finance port security and other non-dredging activities. Several senators, including subcommittee Chairwoman Diane Feinstein (D-Calif.), expressed displeasure with the plan. Bills to ensure all trust-fund receipts continue
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.