Upon final hearing, if the finding is in favor of the petitioners, the court shall make a decree that the proposed mine drainage district be established, stating its boundaries and describing it as "Mine Drainage District No. ......… of the county of .........." giving it the proper number, which decree shall contain a plat of the said boundaries. A certified copy of such decree, including the plat, shall be filed with the county clerk and recorder of the county in which the district is situated, and a second copy shall be filed with the division of local government in the department of local affairs.