Flood area

"Area covered by water when streamflow exceeds the carrying capacity of a channel, or as a consequence of damming a river downstream." (United Nations Publications, 2013) 

Sources

United Nations Publications. "Glossary of Shared Water Resources (English-Arabic): Technical, Socioeconomic and Legal Terminology." (2013). DOI:https://dx.doi.org/10.18356/70b462ce-en