Films and Video gamesEditIt appears in Fellowship of the Ring where Arwen at the Ford of Bruinen calls The Flood to washed out The Nazgul's horses.
The Lord of the Rings: The Battle for Middle-Earth (Xbox360/PC)Edit
The Flood can be used only for the Elven faction to crush your enemies. It cost 25 power points (Same as Good Camapin and Skirmish). Arwen can also use a smaller version of this power, but it still does heavy damage to buildings and units.