Since you raised the issue and I have time now, for future reference:
1. When central sanitation fails, septic systems still work. Toilets will flush with a gallon or two of water hand poured into the tank. Septic systems in flooded areas will not function properly, and will back up into residences.
2. If no septic system is available, liquid waste should be scattered and will generally not hurt plants.
3. Solid waste can be deposited in 5 gallon buckets, and many toilet seats will balance on top.
4. Solid waste can then be collected in 55 gallon drums and burned. Kerosene speeds the process, which should be carried out downwind of any field kitchens or sleeping quarters. Gasoline is risky but will substitute.
Thanks for the info. We're on septic, and so far so good. They have big trucks that can pump the tanks out, but how would you do that during a Cat4 hurricane?
Could the buckets and 55 gallon drum ideas work in a situation like the Superdome?