S.D. Codified Laws § 13-51A-21
In connection with the issuance of any bonds under this chapter, and in order to secure the payment of any such bonds and the interest thereon, the board shall have the power for each such institution to vest in a trustee or trustees the right to receive all or any part of the income and revenue pledged and assigned to, or for the benefit of the holder or holders of bonds issued under this chapter, and to hold, apply, and dispose of the same and the right to enforce any covenant made to secure or pay or in relation to the bonds; execute and deliver a trust agreement or trust agreements which may set forth the powers and duties and the remedies available to such trustee or trustees and limiting the liabilities thereof and describing what occurrences shall constitute events of default and prescribing the terms and conditions upon which such trustee or trustees or the holder or holders of any specified amount or percentage of such bonds may exercise such right and enforce any and all such covenants and resort to such remedies as may be appropriate.
SDCL 13-51A-21