The authority ordering the election shall keep a proces verbal of the amounts and shall forward a copy thereof to the secretary of state, who shall record the copy, and another copy to the clerk of the district court who shall also record the copy in the drainage records.  The remaining copy shall be retained in the archives of the office of the authority ordering the election.  The custodian of the archives or the records of the authority ordering the election shall preserve for a term of three months from the date of the promulgation of the election, the ballots and other returns.