Engineers who need to integrate river-flow analysis data with 3D civil design models recently got a boost with the release of a new extension that ties them together. Until the end of the year, Autodesk Labs is offering Project River Analysis Extension software for free as a sort of trial balloon. The software integrates with AutoCAD Civil 3D and AutoCAD Map 3D for 2012. Photo courtesy of Autodesk, Inc. A screen shot of Autodesk's new River Analysis Extension, which is on Autodesk Labs' site and free until the end of this year. The latest extension can overlay one-dimensional data from
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.