All applications for permits must be made in writing upon the proper blanks for that purpose, and signed by the owner or his authorized agent, and, when it is required, they shall be accompanied by a plan showing the whole course of the drain which is to be constructed, together with the size of the same, the location of all branches, depth of the drain below the floor of the buildings, and such other information as may be required by the director of public works for the proper direction of the work. If the drain is to be connected with a sewer built by private parties, or to pass through property not owned by the applicant, the written consent of the owner must be procured and filed with the application before the permit is issued. (Ord. 697, 10-19-1981)