After more than an eight-month lull in deepwater oil and gas activity in the Gulf of Mexico, the Bureau of Ocean Energy Management, Regulation and Enforcement on Feb. 28 approved the first deepwater drilling permit in the Gulf of Mexico since the Deepwater Horizon explosion on April 20, 2010. Photo: Courtesy of the Coast Guard Boats work to put out fire aboard the Deepwater Horizon on April 20. “This permit represents a significant milestone for us and for the offshore oil and gas industry, and is an important step towards safely developing deepwater energy supplies offshore,” said BOEMRE Director Michael
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.