S.D. Codified Laws § 50-6A-28
An authority may designate the department as the authority's agent to accept, receive, receipt for, and disburse federal and state moneys, and other moneys, public or private, made available by grant or loan or both, to accomplish in whole or in part, any of the purposes of this chapter. The authority shall designate the department as the authority's agent in contracting for and supervising the planning, acquisition, development, construction, improvement, maintenance, equipment, or operation of any airport or other aviation facility.
An authority shall enter into an agreement with the department prescribing the terms and conditions of the agency in accordance with any terms and conditions as are prescribed by the United States, if federal money is involved, and in accordance with the applicable laws of this state. All federal moneys accepted under this section by the department shall be accepted and transferred or expended by the department upon any terms and conditions as are prescribed by the United States.
All moneys received by the department pursuant to this section shall be deposited in the state treasury, and unless otherwise prescribed by the agency from which the moneys were received, shall be kept in separate funds designated according to the purposes for which the moneys were made available, and shall be held by the state in trust for such purposes.
SDCL 50-6A-28