- Levees were too small and weak to hold back Hurricane Katrina's storm surge. Much more robust systems have been proposed for all of southeastern Louisiana.
- Flood control structures already in place in the Netherlands, England and elsewhere could help protect troubled deltas worldwide and also revive vast, dying marshlands.
- Engineers must embrace greater scientific input when considering the siting and construction of barriers--Input that might have mitigated the Katrina disaster.
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