Rainwater tank overflow

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Originally Posted by Big Shed

When I built my place I was told by my plumber to use 100mm sewage pipe for stormwater, for the reasons you pointed out. I did so and so far (7 years) it has stood the test of time.

As you are in Adelaide, chances are you have reactive clay soil (Bay of Biscay clay), the expansion and contraction of this soil is staggering. I know, I used to live in Wattle Park.

For the small saving involved in using 90mm pipe, I think you would be ill-advised to use it under ground.


You only have to look at the relative wall thickess of the 2 pipes, as well as the quality of the fittings.

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SOLD! Thanks Big Shed. Just ?????? that the plumber that did my extension used 90mm stormwater pipe for the pipe that is already underground (and I'm not digging it up!)

Your tank will fill pretty quick if there's a decent downpour...I think if it's 100m² of roof and there is 1mm of rain it equals 1000lt's?

Be wary though it empties as quick as it fills. If you have a 30lt/min pump, and water your garden for 15mins, thats 450lt of water gone. It pays to get the biggest tank your budget and yard can afford.

Yes, sounds like a bit of overkill to me.

One day of showers yielded around 1000l from a 50 sq m garage roof over here recently.

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Originally Posted by Planned LScape

Your tank will fill pretty quick if there's a decent downpour...I think if it's 100m² of roof and there is 1mm of rain it equals 1000lt's?

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I think it's more like 100m2 of roof and 10mm rain equals 1000l of water

Cheers!