Whenever an area within a county and not within a municipality becomes so situated that drainage area coordination becomes advisable, persons within the area may apply to the board or the commission, if one exists, to establish the area as a coordinated drainage area pursuant to this chapter. A board or commission may not form a coordinated drainage area if it is inconsistent with a county-wide drainage plan and ordinances or other controls which have been adopted. The formation of a coordinated drainage area is valid in a county that is in the process of adopting a county-wide drainage plan and ordinances or other controls until such are in place.
SDCL 46A-10A-47