The Dept. of Energy has named a panel of outside specialists to study natural-gas hydraulic fracturing. The panel, which DOE Secretary Steven Chu announced on May 5, will make recommendations within 90 days about immediate steps that could improve the safety and environmental impact of “fracking.” Panel members include representatives from industry, academia, environmental groups and state government.
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.