Whenever a petition has been or shall hereafter be filed in the district court in any county in the state of Kansas having a population of more than 85,000 and less than 130,000, for the establishment of drainage on petition to court as authorized by the provisions of article 7, chapter 24, of the Kansas Statutes Annotated, and when and after the proceedings authorized by said article shall have reached the point where the court shall have approved the boundaries of a proposed drainage district and shall have authorized the commissioners appointed by said court to proceed with final plans, as provided in Kan. Stat. Ann. § 24-705, the said board of drainage commissioners appointed by said court may, with the approval of said court, apply to the board of county commissioners of the county wherein said drainage is to be provided (or if said drainage project covers lands in more than one county, then in the district court of the county in which the greater number of acres of said proposed district are situate), for the incorporation of a drainage district to be composed of the lands found and approved by the court to be benefitted by such proposed drainage.