Hello, I need to redo and install some pipe work around the side of my house as water tends to build up and has no where to go,
I have drawn a diagram of what I intend to do,
so basically it will be a new floor grain, with one downpipe connecting to it, then both connecting to an L shaped grate drain, which connects back into the 90mm pipe, the runs down picking up 2 other down pipes and another bit of grate drain from the shed.
my question is,
will this 90mm (3.54inches) pipe be large enough to handle 3 downpipes and grate drain in between?
I am sure 90mm is the standard here in aus for most drainage, and many connections (corner pieces, T shape etc) are available for it but not so many for larger piping.