After segments have been identified (not necessary to run outage segments), WaterCAD 2024 can calculate the performance of the system when each segment is taken out of service. This is done by clicking on the Criticality button and hitting the Go arrow.

An important consideration in running criticality is whether the criticality is based on a full hydraulic analysis or simply the connectivity of the system. If the user checks the box labeled “Run hydraulic engine”, WaterCAD 2024 will calculate the shortfall in the system based on a full hydraulic analysis. The type of run (steady vs. EPS; PDD vs. non-PDD) is determined by the calculation options of the selected scenario.

If the box is unchecked, WaterCAD 2024 calculates shortfall based on connectivity. In that case, if a node is connected back to a source, it is assumed the demand is met. If the node is isolated for the source, it is assumed that it is not.