At least thirty days before the next general election of such district, the board of directors thereof shall make an order dividing such district into three, five, or seven divisions as nearly equal in size as practicable, which shall be numbered, and one director shall be elected by each division. For the purpose of election in such district, the board of directors must establish a convenient number of election precincts, and define the boundaries thereof, which precincts may be changed from time to time, as the board of directors may deem necessary.
SDCL 46A-4-75