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How can a user find the overflow, inflow and outflow volume through a given element?
SewerGEMS and CivilStorm have a tool called Hydraulic Reviewer that can report the overflow volume, inflow volume, outflow volume as well as the deviations between the inflow and outflow. This tool applies only when using the Implicit or Explicit (SWMM) solvers (see calculation options)
To open Hydraulic Reviewer, go to Tools > Hydraulic Reviewer. To show volume results, 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.