Most of us think about the obvious things to prep with. Water, food, clothing, etc. But one thing that caught my eye in the recent floods that I do NOT currently prep for is the destruction of sewage systems. It's bad enough when it backs up into your basement. But then the authorities pronounce a "no flushing toilets for 10+ days" order on the community.
I have a backup bucket toilet with bags and chemicals designed for emergencies, but if we became subject to a "no flushing" order for any length of time we'd be bugging out if at all possible.