S.D. Codified Laws § 46-7-2
Any appropriator may be required to construct and maintain a substantial headgate or other means of measurement at the point of diversion or at any other point or points as required by the Water Management Board and shall construct or install a measuring device of a design approved by the board at the most practical point or points for measuring and apportioning the water as approved in the permit or license or as determined by the board. The board may order the construction or installation of a measuring device by an appropriator and, if it is not completed within twenty days thereafter, the board may refuse to allow diversion by the appropriator. Devices not of a stationary nature shall be so arranged that they can be locked in place.
SDCL 46-7-2