The Ontario Building Code | Total Load on a Pipe
220.127.116.11. 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.