Importing SWMM4 Network Data

To import network data from a SWMM4 text file:

1. Open the network to be updated
2. Select Import | Model | from SWMM4 text file from the Network menu. This displays the SWMM4 Import Dialog.
3. Enter the path to the text file you want to import in the Network (DAT) box, or use the browse button to select a file from a Windows File Open dialog. (SWMM4 text files traditionally have the extension .DAT, but this is not mandatory).
4. SWMM4 uses the Manning equation to represent roughness. In InfoWorks ICM, Manning values can be represented as either M = 1 / n or n. Use the Select Network Roughness Type radio buttons to select your preference.
5. Set the network system type to an appropriate value using the System Type combo box.
6. Click OK to continue the import. The OK button is only enabled if you enter the name of an existing text file.

Tip

The importer supports the following:

• RUNOFF and EXTRAN blocks in the SWMM4 data files
• Asset data only. Event data (e.g. rainfall, inflow hydrographs, etc.) is not imported
• SWMM4 EPA release v4.31
• SWMM4 v4.4h (partial support only)

For details of the SWMM4 data blocks imported and conversions made by the importer, see the SWMM4 Conversion Notes topic.