Inundation
"1. Overwhelming areas with water that are not normally submerged. 2. Controlled spreading of water for irrigation, etc." (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