I was reviewing the net since it's two years on since Hurricane Katrina and foundthis which shows animated graphic which is quite interesting. It shows levies, surges, water flow etc. You can click on the side toolbar to show or hide any of the things optioned.
http://www.time.com/time/2007/neworleansmap/There are some interesting articles around also on the CNN website which report that katrina was more than likely a CAT2-3 storm when she hit New Orleans, but the finger of blame pointing to the US Army engineers who built those levies which actually made things worse! Good reading for anyone interested.
Mike