You can export Autodesk Civil 3D pipe networks and their associated catchments to edit in Autodesk Storm and Sanitary Analysis.
Autodesk Storm and Sanitary Analysis may be selected for installation from the Autodesk Civil 3D installation wizard. For more information, see Additional Tools and Utilities Available for Installation.
After editing the data in Autodesk Storm and Sanitary Analysis, you can use an STM file to bring the data back into Autodesk Civil 3D.
