I got a no sense spike for the HGL starting at manhole (MH-2-8-1-2-R6) as shown in the screenshot below and the shared Model, that due to the flooding which no expectation to have any flooding there at scenario (FEH-5YR 120MIN), because the other scenario (FEH-10YR 120MIN) with with higher rain event does not have any issue, the physical and the alternative checked and compared without any error.
Regards,
Mohamad Azzam