http://www.nola.com/hurricane/?/washingaway/The above is a link to a series that was published over 4 days in 2002 in the New Orleans Times-Picayne. The series described in detail the threats to the City and the problems faced in evacuations.
Excerpts:
"...evacuation offers the best chance for survival. But for those who wait, getting out will become nearly impossible as the few routes out of town grow hopelessly clogged. And 100,000 people without transportation will be especially threatened."
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" A stronger storm ... could have realized emergency officials' worst-case scenario: hundreds of billions of gallons of lake water pouring over the levees into an area averaging 5 feet below sea level with no natural means of drainage. That would turn the city ... into a lake as much as 30 feet deep, fouled with chemicals and waste from ruined septic systems, businesses and homes. Such a flood could trap hundreds of thousands of people in buildings and in vehicles.... Between 25,000 and 100,000 people would die, said John Clizbe, national vice president for disaster services with the American Red Cross.
Hundreds of thousands would be left homeless, and it would take months to dry out the area and begin to make it livable. But there wouldn't be much for residents to come home to. The local economy would be in ruins. The scene has been played out for years in computer models and emergency-operations simulations. Officials at the local, state and national level are convinced the risk is genuine and are devising plans for alleviating the aftermath of a disaster that could leave the city uninhabitable for six months or more. The Army Corps of Engineers has begun a study to see whether the levees should be raised to counter the threat.
"...some part of the levee would fail," Suhayda said...The water will flow through the city and stop only when it reaches the next higher thing. The most continuous barrier is the south levee, along the river. That's 25 feet high, so you'll see the water pile up on the river levee." Contaminated food or water ...could cause illnesses including salmonella, botulism, typhoid and hepatitis.