A coalition of 23 construction groups, including the Associated General Contractors and the American Subcontractors Association, have endorsed a new model-contract document meant to aid project teams on green building projects. “Despite a critical need, standard-form contracts had failed to adequately address the elevated risks involved in the design and construction of a green building,” says Brian M. Perlberg, executive director of ConsensusDOCS, which recently released the ConsensusDOCS 310 Green Building Addendum. The document defines the relatives roles and responsibilities needed to successfully deliver a green building project, Perlberg says. Under the form, a new role, called a green-building facilitator,
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.