Definitely a concern, as the back alley always floods in sections in the winter. So it might not take much right now to get our basements wet again.
As for your first point, maybe an engineer can chime in but if such a system kept my basement bone dry wouldn't the pressure from all the water around the house possibly crack or shift my foundation? Some folks that pumped their basements too quickly while water was still around the house apparently had this problem.
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