The Army Corps of Engineers wants to raise a levee protecting St. Charles Parish, La., to an average of 18 feet in an effort to withstand surges from a 100-year hurricane. The structure, which includes nine miles of earthen levee and 3,000 feet of floodwall, has been authorized to be built to an average height of 13 1/2 feet. The Corps plan also calls for building T-walls in some locations, which it says are better able to resist wave force.

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