At least 18 more levees along the Mississippi River could fail this weekend, and some experts are suggesting the entire system should be reexamined. Ongoing flooding throughout the Midwest shows "a need for more robust and resilient levee systems," says a dam and levee specialist with the Army Corps of Engineers, who points out that "levees built 50 years ago for agricultural purposes are often now asked to do the work of a residential or urban levee." A Northwestern University engineering professor says increased flooding is due to wetlands destruction, which forces rivers into a narrower channel that floods more quickly.

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