Load the Extension.

Open a View.

Add Themes to the View. The Themes should describe your water supply network. Junctions, pipes and reservoirs would comprise a simple network. The attributes of the themes must adhere to the ArcView/EPANET Data Model (see the section called “ArcView/EPANET Data Model”). You can use ArcView field aliases to map the fields correctly.

Click on the EPANET Themes button. Select the appropriate Themes.

If your fieldnames don't match the ones of the data model, choose "Create Missing Fields" from the DC Water Design menu.

If required, use the ArcView table calculator to populate the fields. Leaving fields empty is fine in most cases.

Choose "Make EPANET Model" from the DC Water Design menu.

If the last step didn't yield any errors, you can create an EPANET input file now. Choose "Write EPANET File" from the DC Water Design menu. Choose filename and location. In case of errors, running "Check EPANET Model" might help you to track down the most common error.

Fire up EPANET and open the created file (*.inp).