Anywhere it rains, it can flood. Flood can be in areas with a low risk of flooding. Just because there hasn't been a flood in the past, doesn't mean there won't in the future. Flood risk is based on a lot of factors including rainfall, landscape, flood-control measures, river-flow and tidal-surge data, flood history and changes due to new construction and development.
To prepare for a flood:
Build an emergency kit
Make a family communications plan
Do not build in a floodplain unless you raise it up and support your home
Raise up the furnace, water heater and electric panel in your home if you live in a high flood risk area
Think about putting in "check valves" to prevent water from backing up into the drains of your home
If you can, build barriers to stop floodwater from entering the building. Seal walls in basements with waterproofing compounds.