The City Manager shall have general supervision and control of all sidewalks and the building, rebuilding or repair thereof, including inspection. It shall be the duty of the Manager to see that the provisions hereof are enforced. He or she may act by himself or herself or through any duly authorized subordinate in any of the matters hereinafter provided to be done by him or her, and shall, whenever authorized by the Council, employ such assistants as may be necessary to enforce the provisions hereof.