I was just wondering if there is a maximum area of roof that you can discharge through a single stormwater pipe out of the curb. Our plumber, instead of piping the downpipe on the front corner of our house out to the curb 10 m or so away, has instead piped the stormwater (uphill slightly) all the way around the house to the opposite rear corner (about 35 m) to join up with the rest of the downpipes and has the entire house draining through a single 90 mm pipe to the curb on our side boundary (corner block). The area of the house would be just under 300 sqm. Just under half of that goes into a tank, but if we get a lot of rain (like recently) and the tank is overflowing into the stormwater pipe, that seems like a lot of water to be going through a little pipe and I am worried the gutters will overflow. The house was previous serviced by three stormwater outlets before we moved it. Any plumbers out there know if there is a rule of thumb for how much area a single stormwater pipe can handle?