Top US official warns of 'heavy' hurricane season

US Homeland Security Secretary Janet Napolitano warned Wednesday that a "heavy" US hurricane season could be in store, after briefing President Barack Obama on latest forecasts.

Levees cannot fully eliminate risk of flooding to New Orleans

Levees and floodwalls surrounding New Orleans -- no matter how large or sturdy -- cannot provide absolute protection against overtopping or failure in extreme events, says a new report by the National Academy of Engineering ...

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