The city, before any such sidewalk shall be constructed, shall provide by a special ordinance for the location of same. Such ordinance shall define the location and grade of such proposed sidewalk with reasonable certainty, shall prescribe its width, and shall provide that the material of which it shall be constructed, and the manner of its construction, be as provided in this chapter, by incorporating therein this subchapter by reference hereto, and when so incorporated this subchapter shall be as much a part of said ordinance as if its terms had been fully set down therein by express recital, and said materials and such construction shall be under the supervision of and subject to the approval of the City Engineer.
('71 Code, § 9-3-2)