Two Senate committees have cleared bills crafted to address aspects of the Gulf oil spill. But whether those measures will become vehicles for wider-ranging energy policy, or climate-change provisions, remains an open question. Some political observers are skeptical that the Senate will be able to approve any sort of wide-ranging bill in a congressional session that will be cut short by the mid-term elections. The Senate Energy and Natural Resources Committee approved a bill on June 30 that would toughen safety requirements for offshore drilling operations, provide adequate funding for more comprehensive inspections of offshore rigs and mandate reforms at
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.