from Dr. Jeff Masters, hurricane guru
http://www.weatherunderground.com/blog/JeffMasters/comm..."So there was little effort given to formulate a plan to evacuate the 100,000 poor residents of New Orleans with no transportation of their own for a Category 4 or 5 hurricane. To do so would have cost tens of millions of dollars, money that neither the city, nor the state, nor the federal government was willing to spend. Why spend money that would be wasted on a bunch of poor people? The money was better spent on projects to please the politicians' wealthy campaign contributors. So the plan was to let them die. And they died, as we experts all knew they would. Huge numbers of them. And they keep dying, still. We don't know how many. Since the plan was to let them die, the city of New Orleans made sure they had a good supply of body bags on hand. Only 10,000 body bags, but since Katrina didn't hit New Orleans head-on, 10,000 will probably be enough.
Admittedly, it is very difficult to safely evacuate 100,000 people with a Category 4 or 5 hurricane bearing down on you. There are only a few routes out of the city, and a full 72 hours of warning are needed to get everyone out. That's asking a lot, as hurricanes are very difficult to predict that far in advance. The National Hurricane Center did pretty well, giving New Orleans a full 60 hours to evacuate. The Hurricane Center forecasted on Friday afternoon that Katrina would hit New Orleans as a major hurricane on Monday, which is what happened. New Orleans had time to implement its plan to bus the city's poor out. However, this plan had two very serious problems--it wasn't enacted in time, and it could only get out 20% of the people in a best case scenario.
The mandatory evacuation order was not given until Sunday, just 20 hours before the hurricane. I have not been able to ascertain from press accounts when the busses actually started picking up people. The mayor says 50,000 made it to the Superdome and other "shelters of last resort", leaving another 50,000 to face the flood waters in their homes. Although 80% of the city was evacuated, it is unclear whether any of the city's poor made it out by bus. And it is very fortunate that Katrina did not hit the city head-on, or else most of those in the Superdome and other "shelters of last resort" would have perished. The death toll from Katrina would have easily surpassed 50,000.
Even if the evacuation plan had been launched 72 hours in advance, it almost certainly would have failed. A local New Orleans news station, nola.com, reported in 2002 on the evacuation plan thusly:
In an evacuation, buses would be dispatched along their regular routes throughout the city to pick up people and go to the Superdome, which would be used as a staging area. From there, people would be taken out of the city to shelters to the north.
Some experts familiar with the plans say they won't work.