Photo courtesy of Mortenson Construction Mortenson has used computer-automated, virtual-environment technology at the Pegula Ice Arena at Penn State to catch and fix problems early. Photo courtesy of JE Dunn Construction Co. BIM technology, including virtual images of mechanical systems like those pictured here, is used by JE Dunn to prevent mistakes that require rework. Related Links: ENR: Integrated Project Delivery ENR: BIM Rework plagues U.S. commercial construction projects, causing problems ranging from longer construction schedules and late delivery to worker injuries and billions a year in lost revenue. In the long term, rework can also affect a construction company's
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.