Flood Plain
Definition and meaning of Flood Plain in real estate.
A flood plain is a flat or low-lying area of land adjacent to a river, stream, or coastal waterway that is naturally susceptible to flooding during periods of high water.
In more detail
Government agencies map these areas to determine flood risk levels, which directly affect local zoning laws and building regulations. Properties located within a one-hundred-year flood plain have a one percent chance of flooding in any given year, which translates to a high cumulative risk over a typical thirty-year mortgage.
Developing land in these zones often requires elevating structures, installing specialized drainage, or using flood-resistant materials. Buyers and investors must research flood plain status before purchasing, as it impacts property value, insurance costs, and future development potential.
Key facts
| Category | Property Types & Construction |
|---|---|
| Regulated by | Local zoning and federal guidelines |
| High-risk designation | One-hundred-year flood plain |
| Impact on buyers | Higher insurance costs and building restrictions |
A developer interested in buying a vacant parcel of land reviews local zoning maps and discovers the property lies within a flood plain, meaning any new home built there must be elevated above the base flood level.
Frequently asked questions
What does the term one-hundred-year flood mean?
It refers to a flood event that has a one percent probability of occurring in any single year, not an event that happens exactly once every one hundred years.
Can you build a house in a designated flood plain?
Yes, but local building codes in many states require specialized engineering, elevated foundations, and proper permits to minimize flood risk.