1) Alluvion 2) Deluge 3) Flood 4) French word used in English 5) Geological phenomenon 1) Deluge 2) Flashflood 3) Flood 4) Freshet 
• (n.) The act of inundating, or the state of being inundated; an overflow; a flood; a rising and spreading of water over grounds. • (n.) An overspreading of any kind; overflowing or superfluous abundance; a flood; a great influx; as, an inundation of tourists.
A condition in which water temporarily or permanently covers a land surface. ... (09 Oct 1997) ... 
In`un·da'tion noun [ Latin inundatio : confer French inondation .] 1. The act of inundating, or the state of being inundated; an overflow; a flood; a rising and spreading of water over grounds. « With inundation wide the deluge reigns, Drowns the deep valleys, and o'...
An annual event in which the Nile would flood its banks every June through September, starting at Aswan and moving northward to the area around Cairo. The layer of silt deposited by the flooding made the soil exceptionally fertile.
an overwhelming number or amount