About Importing Pipe Network Data From a Storm Sewers .stm File

You can import pipe network data from a Storm Sewers Extension .stm file into AutoCAD Civil 3D.

Pipe networks imported from the Storm Sewers Extension can contain hydraulic property information, such as hydraulic gradient lines (HGL) and energy gradient lines (EGL) and more.

When you import the .stm file, if any of the pipe network names in the .stm file match pipe network names in the AutoCAD Civil 3D drawing, you must choose to either create new pipe networks, or update existing pipe networks.

If there are no name conflicts, the new pipe networks are added to the AutoCAD Civil 3D drawing with their existing names.

Before importing an .stm file, it is important to understand issues associated with importing .stm files that were saved prior to version 2010. For more information, see About Moving Pipe Network Data Between AutoCAD Civil 3D and Storm Sewers.

Note: It is important to note that rules are not applied to pipes or structures when importing pipe networks from either LandXML or from the Storm Sewers Extension.

Matching Pipe Network Names

In cases where the .stm file contains one or more pipe network names that match pipe network names in the currently open AutoCAD Civil 3D drawing, you will be prompted to choose one of the following options:

Create new pipe network: When you choose this option, the pipe network will be imported into the drawing as a new pipe network. The name of the newly imported pipe network is appended with a numeric counter (1). For example, StormSewerNetwork1(1).

Update the existing pipe network: When you choose this option, the pipe network will be imported into the drawing and it will update the existing pipe network that has the same pipe network name. For example, if you have a pipe network named StormSewerNetwork1 in the drawing, and you import an .stm file that contains a pipe network named StormSewerNetwork1, then the StormSewerNetwork1 imported from the .stm file updates (overwrites) the pipe network named StormSewerNetwork1 in the drawing.

No Matching Pipe Network Names

As previously mentioned, if the pipe network names contained in the .stm file do not match any pipe network names that exist in the currently open drawing, then the new pipe networks will be added to the drawing with their existing names. These new pipe networks will be displayed in the drawing and in the Prospector tree.