Though green-building experts and construction lawyers laud the good intentions of the U.S. Green Building Council about its popular Leadership in Energy and Environmental Design green-building rating system, many have serious concerns about at least one new requirement in the latest version of LEED, which went into effect on July 1. The requirement, a “precondition” of certification for all buildings under LEED Version 3, says owners must commit to sharing building energy and water-usage data for at least five years after a new building is occupied or an existing building is certified. Another change sending shudders down the spine of
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.