8.7.3.1.Length of Distribution Pipe

(1) The total length of distribution pipe shall
  (a) not be less than 30 m when constructed as a shallow buried trench, or
  (b) not be less than 40 m for any other absorption trench.

  (2) Except as provided in Sentences (1), (3), and (4) every leaching bed constructed by means of absorption trenches
  shall have a total length of distribution pipe not less than the value determined by the formula,

                                                           L = QT/200
       where,
             L = total length of distribution pipe in metres,
             Q = the total daily design sanitary sewage flow in litres, and
             T = the design percolation time.

  (3) Except as provided in Sentence (1), where a leaching bed receives effluent from a Level II, Level III or Level IV
  treatment unit as described in Table 8.6.2.2., the leaching bed may have a total length of distribution pipe not less than
  the value determined by the formula,

                                                           L = QT/300
       where,
             L = total length of distribution pipe in metres,
             Q = the total daily design sanitary sewage flow in litres, and
             T = the design percolation time.

     (4) Except as provided in Sentence (1), where the leaching bed is constructed as a shallow buried trench, the total
     length of the distribution pipe shall not be less than the value determined by Table 8.7.3.1.

                                                           Table 8.7.3.1.
                                       Length of Distribution Pipe in Shallow Buried Trench
                                                Forming Part of Sentence 8.7.3.1.(4)

                               Percolation Time, (T) of Soil, min    Length of Distribution Pipe, m
                                          1 < T ≤ 20                             Q/75
                                         20 < T ≤ 50                             Q/50
                                         50 < T < 125                            Q/30
          where,
                Q = the total daily design sanitary sewage flow in litres, and
                T = the design percolation time.

This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.

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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.