A 100 year storm is a civil engineering thing. Basically means there’s a 1% that a storm (1/100) that size will happen. It is possible for a 100 year storm to happen two years in a row - but the chances are low.
The goal of water management is to keep the water out of the houses, it needs to go someplace, it will go to the golf courses, the tunnels, etc.
My understanding is that very few homes had water intrusion with Irma.
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