Detachment of certain lands; petition; hearing; notice; territory liable for outstanding bonded indebtedness

That where any lands have been included in a drainage district organized under the drainage act of 1905, or acts amendatory thereof or supplemental thereto, and such lands have been harmed and not benefited by improvements made by such drainage district, the owners of such lands may file a petition with the board of county commissioners, describing the lands and naming the owners thereof and asking that such lands be detached from the drainage district. Upon the filing of such petition, the board of county commissioners shall fix a time and place for a public hearing on such petition and shall give notice thereof by one publication in the official county paper at least five and not more than ten days before the date fixed for such hearing. At such hearing all persons in favor and opposed to such petition shall be given an opportunity to be heard. At or within ten days after such hearing, the board of county commissioners shall enter an order allowing or denying such petition. In the event the board shall allow such petition and order the lands detached from the drainage district, such detachment shall be effective as of the first day of March next following such order: Provided, That if such drainage district has outstanding any bonded indebtedness at the time such detachment of territory becomes effective, the lands so detached shall continue to be taxed for the purpose of paying such bonds and the interest thereon until the same have been retired.