S.D. Codified Laws § 46A-10A-15
If a county is conducting or in good faith intends to conduct drainage activity within a reasonable time, or has held or is holding a hearing for the purpose of considering a drainage project, coordinated drainage area, drainage plan, or other official controls, the board, in order to protect the public general welfare, may adopt as an emergency measure a temporary drainage map, temporary drainage ordinances, or other temporary official controls, the purpose of which shall be to regulate drainage and related matters as constitutes the emergency. Within fourteen days of adoption or renewal of any emergency measure, the board shall hold at least one public hearing with notice of the time and place of the hearing published at least ten days in advance in a newspaper having general circulation in the county. An emergency measure is limited to six months from the date it becomes effective and may be renewed for six months, but may not be in effect for more than one year.
SDCL 46A-10A-15