Qatium simulates the behavior of each network using the EPANET toolkit, which can raise some errors while it is calculating and/or finishing the simulation process without returning the results for all the hours shown in the timeline.

In the hours when there are results, they will be shown on the map, in the asset details, and in the pressure, flow, and tank autonomy panels. But if in a selected time step there are no available results, a “Simulation is not available” message will appear.

Some scenarios can cause the simulation to "stop" mid-execution. For example:
If a pipe/valve/pump in the network is closed isolating the entirety of demands in the network, the simulation will be unsuccessful. This can happen for the whole simulation or for the time step when this closure occurs.