Virtual design and construction tools are crossing over from buildings to transportation projects. Officials admit that 3D parametric modeling in the transportation sector has trailed the buildings sector, but they say change is afoot. “In 10 years, we will be living in a BIM world,” predicts Cosima Crawford, chief engineer for the New York City Transit Authority. “It’s our new reality,” she says.That reality has transportation teams tackling the same challenges their building counterparts are seeing in their transition to building information modeling. These include BIM technology issues, process change and institutional buy-in. Image: NYC Transit Authority For new projects,
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.