A floodplain is the low-lying area near a river, stream, or drainage which floods when the water level reaches flood stage. A river terrace is the bench or step that extends along the side of a valley and represents a former floodplain.
Who controls or influences the resource the most?
Flooding along major rivers is sometimes controlled at the discretion of the dam operators. Individual cities have floodplain ordinances that are supported by the county.