California Code
CHAPTER 1 - Accession to Real Property
Section 1015.

1015. If a river or stream, navigable or not navigable, carries away, by sudden violence a considerable and distinguishable part of a bank, and bears it to the opposite bank, or to another part of the same bank, the owner of the part carried away may reclaim it within a year after the owner of the land to which it has been united takes possession thereof.

(Enacted 1872.)