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I'm assuming the entire french(perimeter) drain goes to a covered drywell, which contains a sump pump to push the water out of the house to another drywell/sewer in the yard?
That's the system I have. The perimeter was even skimcoated with concrete and is almost invisible.
A friend is getting a sump installed after her finished basement flooded three times this year. I'm assuming yard water was draining outside the foundation and bubbling up between the slab and foundation.
You want to make sure:
1). The drainage to the drywell sump are 1/4in per foot(I think that's the standard). Check carefully with a level and compact.
2). Sump pump has a dedicated circuit.
3). Your foundation is not undermined by the trench. That could be bad. Best to dig a small hole and check the depth first.
4). Outside grading takes the yard water away from the foundation. If the neighbor's entire yard drains to the side of your house, it might be easier to make a diverter trench than try to pump out a flood.
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Meanwhile other things are still happening.
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