AutoCAD Map 3D

[#1]

There is a new technology preview on Autodesk Labs.

http://labs.autodesk.com/utilities/civil3d_river/

Project River Analysis Extension for AutoCAD^® Civil 3D^® 2012 software and AutoCAD^® Map 3D^® 2012 is a sophisticated river modeling software package supports HEC-RAS within the AutoCAD Civil 3D 2012 and AutoCAD Map 3D 2012 environment. This technology preview of River Analysis makes it easier than ever before to compute water surface profiles for modeling rivers, bridges, culverts, spillways, levees, floodplain and floodway delineations, stream diversions, channel improvements, and split flows.