Related Links: ENR: Flexible Approach to Work ENR: Bidding Edge The use of performance-based contracts has blossomed in recent years with delivery methods such as design-build and construction manager-at-risk, particularly for large jobs. But another method, job order contracting (JOC), has been around for almost 30 years. As the industry looks increasingly toward maintenance of aging infrastructure, the South Carolina firm that claims the origins of JOC hopes its big time has arrived."JOC occupies a nice niche, but a small niche within the overall construction industry," says William Pollak, the new chief executive officer of the Gordian Group, Mauldin, S.C.,
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.