The Ontario Building Code | Total Load on a Pipe
7.4.10.1. Total Load on a pipe
(1) The hydraulic load on a pipe is the total load from,
(a) every fixturethat is connected to the system upstream of the pipe,
(b) every fixturefor which provision is made for future connection upstream of the pipe, and
(c) all roofs and paved surfaces that drain into the system upstream of the pipe.
In Plain Language
The total hydraulic load on a pipe (essentially, how much wastewater flow it must handle) is calculated from every fixture connected upstream of that point, forming the basis for sizing decisions throughout the system.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.