A House Energy and Commerce subcommittee has approved a measure that would prevent the Environmental Protection Agency from moving forward with greenhouse-gas regulations under the Clean Air Act. The bill, sponsored by Energy and Commerce Committee Chairman Fred Upton (R-Mich.), cleared a subcommittee of his panel on March 10. In the Senate, James Inhofe (R-Okla.) has introduced a companion bill.
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.