PART 8 — SEWAGE SYSTEMSUpdated for the 2024 Ontario Building Code
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8.7.3.2.Length of Leaching Chamber
(1) The total length of leaching chamber 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) and (3), the total length of leaching chamber shall not be less than the value
determined by the formula,
L = QT/200, for a Type I leaching chamber, or
L = QT/300, for a Type II leaching chamber,
where,
L = total length of leaching chamber in metres,
Q = the total daily design sanitary sewage flow in litres, and
T = the design percolation time.
(3) When a treatment unit described in Article 8.6.2.2. is used in conjunction with a leaching chamber, the total length
of leaching chamber shall not be less than the value determined by the formula,
L = QT/300
where,
L = total length of leaching chamber 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 leaching chamber shall not be less than the value determined by Table 8.7.3.2.
Table 8.7.3.2.
Length of Leaching Chamber in Shallow Buried Trench
Forming Part of Sentence 8.7.3.2.(4)
Percolation Time, (T) of Soil, min Length of Leaching Chamber, 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.