No method of conducting drainage under the public sidewalks in accordance with the provisions of this subtitle, shall be deemed a sufficient compliance with the terms of this subtitle unless such method is approved and so certified by the Director of Public Works. City Code, 1927, art. 45, §90 1950, art. 35, §40 1966, art. 26, §19 1976/83, art. 26, §22 Ord. 04-111 Ord. 76-139