Near urban areas, even in small cities, RV parks and sometimes mobile home parks get built on flood plains. Nobody else wants the land the periodically floods, making it cheap enough to rent for RV parking. Another popular use is RV and boat storage lots.
The RV "resort" in our town is about six feet under water for 10 year floods, as much as 28 feet under for "100 year" floods, two of which we have had in the 35 years I've lived here.
But on this flood controlled river, the RV park has 12 to 36 hours notice for evacuation. There is a RV storage lot on the flood plain of a nearby creek that can rise from almost empty to flood stage in less than 30 minutes, from a single heavy thunderstorm.