| Product(s): | SewerGEMS, SewerCAD, CivilStorm, WaterCAD, WaterGEMS |
| Version(s): | All |
| Area: | Output and Reporting |
When graphing a time series result field (such as calculated depth/rise for a conduit in SewerGEMS), the observed peak in the graph is less than the corresponding maximum statistical result (such as "Depth (Maximum) / Rise").
Or, the "is ever flooded?" shows as True (for a manhole in SewerGEMS), yet the graph of HGL never reaches the rim and the overflow graph is zero for the whole simulation.
The problem may be due to the timestep and you may need to use a smaller output increment.
Graphs will plot results based on the reporting timestep (or "output increment" for the SWMM solver in SewerGEMS), whereas the statistical results (maximum, minimum, etc) are based on all calculated timestep.
So, if there is a sharp peak that occurs between two reporting timesteps, the calculated peak can be significantly higher than the peak of the graph.
In the case of the "is ever flooded?" discrepancy, the overflow could be occurring between the Output increments causing it to not display in graphs. For example check the "time to maximum overflow", it may show for example 642 minutes when the output increment is 5 minutes, so the graph only shows results for 640 minutes and then 645 minutes. If the overflow occurred for a brief period of time between these output increments, it would not display in the graph. In this case, try using a smaller Output Increment.