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When simulating, it is rare to be interested in what is happening across the whole network but the choices available at run time are either to have results for everywhere or, results for everywhere with the addition of a gauged set (for more detail) or, a gauged set only (by setting the results timestep to zero).
The drawback with only using a gauged set is that replay isn't available so you are left having to look at several hydrographs. Its extremely had to see why something is happening - e.g. you see a strange shape in a hydrograph but what caused it?
I would like to be able to have a second selection set for which full results would be produced at the results timestep. I think using a lasso would be the best way to do this (which could then be saved as a selection set in the usual way and then dragged into the simulation dialogue at a run time).
I have recently been looking at a catchment where continuous simulation with radar rainfall has been run over a few months. But downloading the results to be able to view them has taken well over 5 minutes. I didn't need to look at the smaller upstream sewers so I doubt that I needed to generate more than 10% of the results. I was also comparing with telemetry data and some flow monitors so, for these locations I used a gauge set as well. Creating an "observed and predicted custom graph" had the same wait times for a set of results but, these took longer to load as there was often more then one version of the model to compare.
Here are some benefits of using a selection set for the results
Shorter run times
Shorter download and display times
With plan view displayed, replaying results helps to give an understanding of when different areas flood in relation to each other.
With a long section displayed, replay helps with understanding of how the sewer fills up, whether backwater effects are occurring (and where from) or if the sewer fills due to high flows from upstream
You get to see things happening which you would not have seen otherwise.
For the last three, it is a case of “a picture paints a thousand words“ and can help with understanding why problems are occurring in a way which tabulated results cannot.
