Powerplants and large industrial facilities that emit more than 25,000 tonnes of CO2 annually must begin monitoring and reporting on their greenhouse-gas emissions yearly as a result of an Environmental Protection Agency rule that goes into effect on Dec. 30. The regulation will cover approximately 85% of the nation’s greenhouse-gas emissions and apply to roughly 10,000 facilities, EPA says. The first reports will be due in 2011. Andy Byers, associate vice president of Overland Park, Kan.-based Black & Veatch’s environmental management practice division, says the rule will create opportunities for some engineering firms. “Those facilities that are subject [to the
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.