S.D. Codified Laws § 46A-10A-8
The provisions of this chapter and chapter 46A-11 do not abrogate or limit the rights, powers, duties, and functions of the State Water Management Board with reference to water rights, flood control, outlet elevations for public lakes, or ordinary high and low water marks on public lakes, but are supplementary thereto. This chapter and chapter 46A-11 do not limit or affect the laws of this state relating to organization and maintenance of irrigation districts, water user districts, water project districts, water development districts, conservation districts, or watershed districts, nor does it infringe upon or establish any rights superior to any existing water rights. The provisions of this chapter may affect drainage districts only as outlined under provisions of § 46A-10A-43.
SDCL 46A-10A-8