The secretary of the drainage board shall prepare and sign duplicate originals of the minutes of all proceedings of the drainage board and the augmented drainage board, one to be retained by him and the other to be filed with the director of agriculture. The originals of all proceedings and records of the drainage board and the augmented drainage board shall be kept on file with the secretary until the completion of the project, at which time they shall be forwarded to the director of agriculture for filing in his office. In the meantime the director of agriculture may require the secretary to furnish him with certified copies of records in the office of the secretary for filing in his office and such certified copies so filed shall have the same force and effect as the originals.