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Subcritical and Supercritical flow in SewerGEMS

Good morning,

I simulated a sewer system in SewerGEMS with the calculation options Covex, Dynamic wave and SWMM Solvers. In the simulation with the Dynamic Wave option, it notifies me that I have a froude number greater than 1, what does that mean?
Another doubt that I have is that with the Dynamic Wave option the flow rate through the outfall is 18.27 l / s but in the Convex and SWMM Solvers options the flow that comes out is 18 l / s. Why this difference in flow? .I attach the model in SewerGEMS to be reviewed.