All pipes connected with the service inside any building shall be laid with an inclination towards the point where the stop and waste valve is located, without any sags and pockets, so that the pipes may thoroughly empty themselves from water when the waste is opened. In cases where sags or traps are unavoidable, an additional stop and waste shall be put in so as to let the water out of the sags.
('67 Code, § 50.32) (Ord. 96-1931, passed 7-7-03)