A city under sea level has a drainage problem

Washington Post:
‘Nothing you can do’: It wasn’t even a hurricane this time, but New Orleans flooded anyway

Panic and rough memories surfaced in New Orleans this week as residents faced a reminder of what can happen with heavy rains, even though U.S. taxpayers have spent nearly $15 billion rebuilding the city’s flood protections since 2005.
Engineering to avoid flooding is pretty straight forward.  You can raise the level of the ground, dig retention areas to hold excess water, or you can rely on huge pumping stations to remove excess water.  Even after Katrina and the billions spent on New Orleans, it still has not managed to engineer a solution.

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