[Allowance of petition for annexation; certified copy of

order and plat; recording; effect; evidence.] Upon the allowance of such petition and in case no protest has been filed with the board within thirty days after the entry of said order as aforesaid, a certified copy of the order of the board of directors making such change, and a plat of such district showing such change, certified by the president and secretary, shall be filed for record in the office of the county clerk of each county in which are situate any of the lands of the district, and the district shall remain an irrigation district as fully to all intents and purposes as if the lands which are included in the district by the change aforesaid had been included therein at the organization of the district; and said district as so changed and all the lands therein shall be liable for all existing obligations and indebtedness of the organized district. Upon the filing of the copies of the order and the plat, as herein mentioned, copies thereof, certified by said county clerk, shall be admissible in evidence to prove the inclusion of said lands in said district.