We all know it was predicted before, in terms of the potential impact of a large hurricane on the City of New Orleans, but what I did not realize is how accurately professionals in the area had come in their estimations.

There are excerpts from an article in The Natural Hazards Observer called "What if Hurricane Ivan Had Not Missed New Orleans?" that was written by Shirley Laska of the Center for Hazards Assessment, Response and Technology at the University of New Orleans in November 2004, after Hurricane Ivan:

"Approximately 120,000 residents (51,000 housing units x 2.4 persons/unit) do not have cars. A proposal made after the evacuation for Hurricane Georges to use public transit buses to assist in their evacuation out of the city was not implemented for Ivan. If Ivan had struck New Orleans directly it is estimated that 40-60,000 residents of the area would have perished...

"Regional and national rescue resources would have to respond as rapidly as possible and would require augmentation by local private vessels (assuming some survived). And, even with this help, federal and state governments have estimated that it would take 10 days to rescue all those stranded within the city. No shelters within the city would be free of risk from rising water. Because of this threat, the American Red Cross will not open shelters in New Orleans during hurricanes greater than category 2; staffing them would put employees and volunteers at risk. For Ivan, only the Superdome was made available as a refuge of last resort for the medically challenged and the homeless...

"In this hypothetical storm scenario, it is estimated that it would take nine weeks to pump the water out of the city, and only then could assessments begin to determine what buildings were habitable or salvageable. Sewer, water, and the extensive forced drainage pumping systems would be damaged. National authorities would be scrambling to build tent cities to house the hundreds of thousands of refugees unable to return to their homes and without other relocation options. In the aftermath of such a disaster, New Orleans would be dramatically different, and likely extremely diminished, from what it is today...

"Should this disaster become a reality, it would undoubtedly be one of the greatest disasters, if not the greatest, to hit the United States, with estimated costs exceeding 100 billion dollars. According to the American Red Cross, such an event could be even more devastating than a major earthquake in California. Survivors would have to endure conditions never before experienced in a North American disaster..."