How about a levee system with double walls? It would have an interior wall which is tall for big storms, perhaps with large vanes on the very top so that it can be opened when not needed. The outer wall would be lower (perhaps for Cat 2-3 hurricanes). If the water goes over the first it would flow into a large drainage canal, where it would be directed to pumping stations. The first wall would break the impact from the storm surge, and if it is overtopped or broken then the canal would direct the water away from homes.

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