Nebraska Administrative Code — Title 316 (Revenue) + Title 350 (Property)
Neb. Admin. Code § 350-14-002.02 — Accretion Land is the increase of land by the gradual deposit of water borne solid materials
Accretion land areas may vary in size as the associated body of water either raises or lowers, or as a stream or river changes its channel. It is the opposite of erosion.
Source: official text