Issued by a consortium of energy-efficiency advocates, two new reports recommend ways to overcome hurdles to achieving net-zero emissions in commercial buildings. Barriers include cost and a reliance on prescriptive, instead of performance-based, energy codes. The reports, commissioned by the Dept. of Energy, represent input from more than 430 groups, including the American Institute of Architects and the National Association of State Energy Officials.
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.