S.D. Codified Laws § 46A-18-63

A district may purchase real property, rights-of-way, or easements as necessary. If necessary, it may condemn them. If a district finds it necessary for maintenance of any part of improvements already constructed to add further construction or other improvements, the district, if not able to agree with the landowner on the terms for the acquisition of the interest in land needed for such purpose, may condemn the property for the purpose of fixing the amount to be paid for the interest in property so taken. Appraisal of the property shall be made by a committee of appraisers approved by the directors.