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0830 hurricane 06

An egret perches above rising waters Wednesday, Aug. 29, 2012 in Bayou Cane, La. Tropical Storm Isaac has dumped almost a foot of rain in parts of Louisiana. (AP Photo/The Houma Daily Courier, Chris Heller )

Gallery: More photos from Hurricane Isaac

Aug. 30, 2012 @ 11:37 AM

Hurricane Isaac poured unrelenting rain Thursday, flooding areas north and south of New Orleans even as the city's fortified defenses held and forcing officials to launch speedy evacuation and rescue efforts in the face of fast-rising waters.