The Define Trace Area function allows you to define areas for the pressure zone analysis. If no user-defined trace areas are selected, the entire model will be analyzed. Pressure zone boundaries will include closed pipes or valves, closed check valves, pressure or flow regulator valves, pumps, tanks and reservoirs. When these elements are encountered the pressure zone trace will stop.
The user You may also choose to analyze zone boundaries based on some subset of the entire model. An active domain, a selection set, or a query set can alternately be selected as the area for analysis. These options can be useful to limit the trace of a very large model to a smaller sub-set or area. Select the "No User Defined Boundary Pipes" option to trace the entire model.