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Large difference in "External Inflow" and "External Outfall" - SewerGEMS

Hello,

after the calculating the sanitary sewage system with Explicit (SWMM Solvers) solver in SewerGEMS, I received the "External Inflow (ML)": 472 and "External Outfall (ML)": 549.

What could be the reason for such large differences in the values of these two parameters? How can this difference be made out?

Model has above 20000 manholes and conduits and 60 pressure pipes.