Despite billions of dollars in upgrades, the levees protecting New Orleans could be swamped by a hurricane as small as a Category 2, the National Oceanic and Atmospheric Administration said Monday. For the first time, researchers traveled some 1,000 miles of levees armed with GPS devices to accurately measure the height of the city's defenses. Those measurements confirmed that, "In general, the pattern hasn't changed remarkably," said Stephen Baig, a storm surge expert with the National Hurricane Center. "Somewhere between a Category 2 and Category 3, overtopping occurs."

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