7.4.8.1.Minimum Slope

(1) Except as provided in Sentences (2) and (3) and Articles 7.4.10.8. and 7.4.10.9., drainage pipes that are NPS 3 or
  less shall have a downward slope in the direction of flow of at least 1 in 50. (See Note A-7.4.8.1.(1))

  (2) Sentence (1) does not apply to a force main.

  (3) Where it is not possible to comply with Sentence (1), a lesser slope may be used if it will produce a gravity flow of
  not less than 0.6 m per second.

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.