alluvion

Noun

• clay or silt or gravel carried by rushing streams and deposited where the stream slows down

• the rising of a body of water and its overflowing onto normally dry land
  • plains fertilized by annual inundations
    

• gradual formation of new land, by recession of the sea or deposit of sediment

Related words

• Synonyms: 
  alluvial sediment , alluvial deposit , alluvium , flood , inundation , deluge