Note: How to Decide on a Time Step in InfoSWMM
Step 1: Your first guess was 300 seconds which had a very large continuity and unstable links. If you look at the your average time step a good time step would be 10 seconds based on your average time step of 2.6 seconds.
Step 2: Run your model with a time step of 10 seconds and check the flows and the continuity error. In this case by using a maximum time step near the average time step you got rid of the continuity error and the unstable link flows.
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