S.D. Codified Laws § 46A-1-69
Upon application to the Board of Water and Natural Resources by a party to the loan agreement, the board may suspend payment of any annual installment due on a loan made for the purpose of constructing an irrigation project when the board finds that because the prices of the crops being irrigated in that year have been lower than the costs of producing those crops, the borrower will suffer undue financial hardship. In making such determination, the board shall consider the annual installment due and a reasonable return to the farmer as costs of production and shall further consider the effect previous years' prices should have had on the borrower's current financial condition. Interest shall not accrue on the loan over the period for which repayment is suspended, and the term of the loan shall be extended for the number of years annual payments are suspended.
SDCL 46A-1-69