Petitions in a form approved by the State Conservation Commission for including additional territory within an existing conservation district may be filed with the commission, and the proceedings provided for in §§ 38-8-2 to 38-8-18, inclusive, in the case of petitions to organize a district shall be observed in the case of petitions for such inclusion. If two-thirds of the voters registered for the last general election in an area proposed for inclusion or addition to an existing district file a petition with the commission for inclusion, the area shall be included within the district.
SDCL 38-8-19