Based on the results of a drainage plan hearing or hearings under § 46A-10A-22, a board's action upon a drainage plan or any part, adjunct, amendment, or addition shall be by resolution or ordinance, as appropriate, carried by the affirmative votes of not less than a majority of all the members of the board upon a finding that the plan is feasible and conducive to the public welfare and necessary or practicable for draining land in the county.
SDCL 46A-10A-23