S.D. Codified Laws § 43-17-10
Current with legislation signed by the governor on or before 3/6/2024
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.
SDCL 43-17-10