A trace analysis determines the percentage of the water at all nodes and links in the system. The source is designated as a specific node in the system and is called the trace node. In systems with more than one source, it is common to perform multiple trace analyses using the various trace nodes in successive analyses. The source node and initial traces are specified in the Trace Alternative dialog box (for more information, see Trace Alternative). To configure for a trace analysis:

1. Click the Analysis menu and select Calculation Options.
2. In the Calculation Options manager, click the New button to create a new calculation option definition.
3. Change the Calculation Type to Trace.
4. Specify the Calculation Times and the Trace Tolerance. Optionally, specify Hydraulics, Adjustments, and/or Calculation Flag settings. Close the Calculation Options dialog.
5. Assuming you have not already set up a Trace alternative for this scenario (including defining the trace node), go to the Alternatives tab, click the Ellipsis (...) or New button next to the Trace choice list, and add or edit a trace alternative. Specify the trace node to be used for this analysis and provide the appropriate data. Back in the Alternatives tab, choose the desired alternative from the Trace Alternative choice list.
6. Click the Compute button.