New Orleans under water
Much of New Orleans was flooded after Hurricane Katrina broke through levees that protected the low-lying city. The extent of the flooding is especially apparent when comparing satellite images of the city taken before and after the storm. In both images, Lake Pontchartrain is along the top and the Mississippi River is in the lower right corner.
Read the full article here : CNN.com Specials
You should definately check out this link as it has satellite images of March 9,2004 and August 31, 2005. So you can compare yourself.