We are a week after the disaster, fortunately, we had only little rain, nothing that evaporation can't compensate.
We had a really bad weather all the week, it's always raining, the earth is mud, but... I need to finish this to avoid another flood during my holidays.
So, I did the first and second actions I was planning in my previous post, I elevated a bit the level of the edge to be aligned on both side, and I digged a bit around to create a drain.
In this hole, I have a pierced tube, that is wrapped with geotextile, and with gravel on top of it to let the water pass easily.
This move all the water to the gutter around my terrace, and ensure a clean evacuation.
Next step is to add the overfull in the pond !