It shall be the duty of the city engineer to prepare suitable plans and specifications for the cutting and removal of curbs when it is desired to construct any driveway entrance to any private premises or lots used in the city for parking purposes. It shall be the duty of any person, company or corporation having a permit for the removal of curbs to construct or reconstruct any entrance or sidewalk constituting part of such entrance in accordance with the plans and specifications therefor. No such entrance shall block or impede the free flow of water along the gutter or drainage ditch and no such entrance shall be constructed above the grade level or drainage course. (Prior code § 14-207)