Meaning : Gradual formation of new land, by recession of the sea or deposit of sediment.
Meaning : The rising of a body of water and its overflowing onto normally dry land.
Example :
Plains fertilized by annual inundations.
Synonyms : deluge, flood, inundation
Meaning : Clay or silt or gravel carried by rushing streams and deposited where the stream slows down.
Synonyms : alluvial deposit, alluvial sediment, alluvium