After some bumps on the road to publication, the nation’s first code-intended commercial green building standard is available from the American Society of Heating, Refrigerating and Air-Conditioning Engineers. Use of Standard 189.1, which covers site location, energy use, recycling, water efficiency, indoor air quality, materials, resources and a building’s impact on the atmosphere, should result in a “greener” building than use of ANSI/ASHRAE/IESNA’s Standard 90.1-2007, says ASHRAE. ASHRAE, which developed 189.1 with the Illuminating Engineering Society and the U.S. Green Building Council, expects the new standard to be adopted into local building codes. Details about 189.1 are available at www.ashrae.org/greenstandard.
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.