The flooding referenced is the kind of thing that happens when you build infrastructure that is below sea level to begin with. (!?!) And then put in a drainage

The flooding referenced is the kind of thing that happens when you build infrastructure that is below sea level to begin with. (!?!) And then put in a drainage pipe system that allows water to flow out quickly during low tides, but lacks the check valves needed to prevent that water from flowing back in just as quickly during high tides. (!?!)