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How can a user find the overflow volume at a given node?
SewerGEMS and CivilStorm have a tool called Hydraulic Reviewer that can report the overflow volume, as well as the deviations between the inflow and outflow.
To open Hydraulic Reviewer, go to Tools > Hydraulic Reviewer. To show the overflow volume, select the tab "Storage Area Volume Balance". Make sure that you are in the scenario you wish to view the results, then click the Compute button. Once the tool is completed, you will see inflow and outflow volume results, overflow volume, change in storage, and deviation results.
If you are interested in the total system overflow for a model, you can get this from the Calculation Summary that is generated after computing the model. You can access this by going to Analysis > Calculation Summary.