A simulation run is a combination of drainage network and climate data. For single-event simulation, the climate data may be design storm, regional storm or observed rainfall event. For continuous simulation the climate data is a combination of long-term precipitation, temperature, and evaporation time series data. Essentially, creating a simulation run is to combine the drainage network (scenario) with the right climate data. For single-event simulation, it is also possible to combine same drainage network with various design storms.

In VO, the simulation run is always created for current working scenario. Therefore, there is no need to specify the scenario for a simulation run. Setting up a simulation run is just to specify the climate data.

Note that, to create the simulation run, the scenario must be free of error and the climate data is already added to the Project Manager.