The rising flood waters overwhelmed pumping stations that would normally keep the city dry.
Hull University expert Prof Lynne Frostick said flooding remained a threat despite investment in drainage and pumping stations.
That means laying hundreds of miles of pipelines and building countless pumping stations.
The year-long project has seen the installation of two new pumping stations, and construction of a new 5km (three-mile) pipeline.
On his first day on the job, he inspected water pumping stations in parts of Bangkok most vulnerable to flooding.
The commander of the Army Corps of Engineers told CNN that only 40 percent of the pumping stations in New Orleans were working.
Those gravity-defying levees, along with pumping stations designed to move water away from the center of the Earth, kept the city pretty darn dry.
The water reflected the gray-blue of the darkening sky, and the lights of the water-pumping stations had come on, making them look like a line of floating gazebos.
However, Saudi intelligence has been successful in subduing al Qaeda cells in the kingdom in recent years, while security at oil refineries and pumping stations has been reinforced.
He added that sewerage upgrades carried out at pumping stations in 2001 were operating at peak capacity during the storm and that a stand-by pump had also been switched on.
The organisation said it had discovered that four other categories of outflows - for example at pumping stations or waterworks - perform the same function, bringing the total figure to an estimated 31, 000.
If implemented, the Baltic Deepwater Oxygenation (Box) project would require around 100 pumping stations built around the Baltic Sea to transport oxygen deep underwater to counteract the declining amounts of oxygen and prevent the growth of the dead zone.
On Thursday, an estimated 28% of New York metro area gas stations were not pumping fuel (or could not be contacted), according to the Energy Information Administration.
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