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Implicit Solver - Channel flooding

Hello,

I'm simulating a open channel network in sewergems using Implicit solver. In certain stretches, it shows the HGL is above the ground level and I was in the intention that it is flooding. Following is a sample figure.

But the post in the below link confused me.

https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/17596/what-happens-when-the-water-level-exceeds-the-top-elevation-of-an-open-channel

How can we find out whether the channel get flooded, isn't it , if HGL is above the GL of the channel segment? Is overflowing and flooding are two different conditions?

Regards

Nishadi