(a) Subject to the provisions of Kan. Stat. Ann. § 19-270, and amendments thereto, and if the board of supervisors determines that land located outside the district benefits by the drainage improvements of the district, the board shall present a petition to the board of county commissioners of the county in which the greater portion of the territory of the original drainage district is located asking for the extension of the territorial limits of the district to include such land. The board of county commissioners shall investigate such petition and determine whether such land should be included within the district.

(b) The petition submitted pursuant to subsection (a) shall:

(1) Describe the land proposed to be included within the drainage district by sections or subdivisions of sections, according to the government survey or by metes and bounds;

(2) state that the land and property thereon are subject to injury and damage from the overflow of some natural or manmade watercourse, naming or describing it;

(3) state that improvement of the channel of such watercourse, the construction and maintenance of levees, drains, ditches, dikes, jetties, riprap or other works are necessary to prevent such overflow;

(4) state that such improvement or works will be conducive to the public health, convenience or welfare; and

(5) contain a prayer that the land described in the petition be included within such drainage district. If any land requested to be included in the original drainage district is located within the corporate limits of any city, it shall be sufficient to describe such land by appropriate number as lots or blocks or parts of lots or blocks.

Whenever a petition is presented to the board of county commissioners pursuant to this section, the board of county commissioners shall fix a time for the hearing of such petition. Notice of such hearing shall be published at least once in a newspaper of general circulation in the county in which the land described in the petition is located at least 10 days before the date fixed for the hearing.

(c) Following such hearing, if the board finds the petition is in conformity to the requirements of this section and that the allegations thereof are true, the board shall make a finding and decision to that effect, and shall declare the land described in the petition to be annexed to and included within the original drainage district. No territory within any city located in a county having an assessed tangible valuation of more than $150,000,000 shall be included within any drainage district without the approval of the governing body of such city.