S.D. Codified Laws § 46A-1-11
If the Board of Water and Natural Resources determines that it is necessary to carry out any of the objects and purposes of the water plan, through the construction of a water facility that has been established by the Legislature as a part of the State Water Resources Management System, the board shall, in cooperation with such federal, state, and local agencies or entities or private interests as may be concerned, prepare preliminary cost estimates, estimates of resources, if any, to be contributed from all other sources to aid in the construction, and estimates of the revenues that might be anticipated from the facility from all purposes and functions. The board shall adopt a resolution declaring that the public interest and necessity require the carrying out of these objects and purposes and requesting that the Legislature authorize the construction of this part of the State Water Resources Management System.
SDCL 46A-1-11