The U.S Army Corps unveiled a $1.7-billion, 10-year plan this week to restore the ailing Anacostia River in the Washington, D.C. metropolitan area to health. U.S. officials brief public on river cleanup. The plan, two years in the making, identifies 3,000 projects to help restore the severely polluted river and watershed spanning 176 sq miles of land through a combination of stormwater controls, stream restoration, wetland creation and restoration, fish blockage removal, reforestation and controlling trash and chemical contamination “Now we can begin even more aggressive action to clean up the Anacostia River,” said U.S. House Majority Leader Steny Hoyer
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.