siltationnoun [ U ]
uk/sɪlˈteɪ.ʃən//sɪlˈteɪ.ʃən/specializedthe process of blocking something with sand or soil; the sand or soil that blocks something:
Construction on the land would cause siltation, pollution, and other degradation of the river.
Salts, chemicals, and siltation could pollute the stream.