According to CNN... the levees were built to sustain against cat 3 hurricanes,,, perhaps in the future,, they will make them stronger in accordance to the growing intensity of the weather and higher as well.
Its obvious that the Govt underestimated the devastation Kastrina would inflict on the surrounding areas and hence,, the slow and almost utter lack of support and rescue ppl for those who were forced to stay behind. Its a shame as its costing entire families and pets thier lives. Help is coming too little and defiantly too late.