1. Any decree or order of the court organizing any drainage district, confirming the report of commissioners, extending or changing the boundary lines of the district, reorganizing a district or otherwise pertaining to any procedure of the district may be amended or changed at any time by the court, by correcting the names of the landowners, by adding or amending any such names, or by adding, amending or correcting the description of any lands within the district, or that are alleged to be within the boundary of such district, or any other way amend or change any decree of the court pertaining to the district that may be deemed necessary to better carry out and fulfill the objects and designs of the drainage district without impairing the obligations of the district and without relieving the security of any obligations executed by or in behalf of any such districts.

2. When any such amendments are desired, the board of supervisors shall present a petition to the court organizing the district, in which shall be set forth the amendments or changes desired with the names of the owners and description of lands to be affected by the proposed amendments, changes or corrections; each owner of such lands not a party to the original proceedings shall be served, if a resident of this state, in the manner provided for by section 506.150, and if a nonresident, in the manner now provided by subsection 6 of section 506.160, or by publication as provided by section 242.030; if unknown, service shall be by publication in the manner provided for in section 242.030; any landowner objecting to the petition may file objections within fifteen days after the last publication of the notice or if personal service is had, within fifteen days after service is had.

3. The matters in said petition and all objections if any be filed shall be heard and determined by the court in a summary manner and as speedily as possible. Any number of amendments or corrections may be included in one petition, and any such amendments or corrections may be allowed or rejected as may be found just and right by the court.