Drain pipe size for water tank.

[ubeaut]

Hi,

Just have a quick question. I'm currently installing a water tank that is approx 7000 litres in capacity, it is connected to a colourbond shed via 90mm pvc stormwater pipe. The shed is 6m x 6m in size and has a gable roof.

Now with the drain pipe would I get away with 2" or 50mm pipe?

Is there a formula to work this out?

Thanks in advance.


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