To ensure the safety of offshore oil and gas operations, a presidentially appointed 2010 Gulf oil- spill commission has called for a new oversight and enforcement agency at the Dept. of the Interior and offered a long list of other recommendations for government and industry. Agencies and the private sector could adopt some of the changes on their own. Other steps would require new federal legislation. Photo: Courtesy of U.S. Coast Guard In a comprehensive, 398-page report released on Jan. 11, the National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling issued 15 recommendations. Leading the list
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.