The grade of all streets, sidewalks and alleys shall be established by the Common Council and recorded by the Clerk-Treasurer in his office. No street or alley shall be worked or sidewalk constructed until the grade thereof is established.
No person shall alter the grade of any street, alley, sidewalk or public ground, or any part thereof, in the City unless authorized or instructed to do so by the Common Council or the Director of Public Works. All such alterations of grade shall be recorded in the office of the Clerk-Treasurer.