The Plan file contains the settings used to run the model such as the simulation window, what time steps to use, and what equation sets to use. The main things that we will do for now is ensure that the geometry and Unsteady Flow files are associated, and enter the Simulation Time Window.
Here I have named the Plan file 100yr as that is the event we will be running. The Short ID is used to display the Results and is also used as the Part F in the output DSS file.
The Simulation Time Window should cover the Time of Concentration of the watershed. There are equations out there to calculate the time of concentration, but for now I will just guess that it is less than 2 days. Starting it on 01Jan2000 is arbitrary as this is a hypothetical event. If we were simulating an actual historical event, the Simulation Time window would match the event.
There are other options we can tinker with that can improve model stability but we will cover those later. For now we just want to run the model.
Once you have entered the simulation window for the event, press Compute to run the model!
A new window will popup with the Runtime Messages. Here it gives a brief summary of the settings used in the model and gives the status of where it is in the model simulation. This model took 13 minutes to run on my computer, which is pretty quick for a 2D model, which can run for several hours. We also see the Volume Accounting Error is low which is good. If it were over 2% we would start to get worried that water is being lost in model that is not accounted for.
Now that we have successfully run the model we can View the Results.
Mapping T&T 