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Building Category 5 protection, however, is proving to be an astronomically expensive and technically complex proposition. It would involve far more than just higher levees: there would have to be extensive changes to the city's system of drainage canals and pumps, environmental restoration on a vast scale to replenish buffering wetlands and barrier islands, and even sea gates far out of town near the Gulf of Mexico.
The cost estimates are still fuzzy, but the work would easily cost more than $32 billion, state officials say, and could take decades to complete.