The Ontario Building Code | Sizing
8.4.2.3. Sizing
(1) A Class 2 sewage system shall be designed and constructed so that the loading rate to the side walls shall be not more than the value calculated using the formula,
where,
LR = loading rate of the sidewalls in litres per day/m2, and
T = percolation time.
Section 8.5. Class 3 Sewage Systems
8.5.1. General Requirements