(a) After the commissioners have made a final decision, they shall issue a decree confirming their report insofar as it remains unchanged and shall approve and confirm changes in the report.
(b) The final decree and judgment of the commissioners shall be entered in the minutes of the board, and certified copies shall be filed with the county clerk of each county in which part of the district is located and shall be notice to all persons of the contents and purpose of the decree.
(c) The findings of the commissioners which relate to benefits and damages to land and other property in the district are final and conclusive.