There used to be this resource where you could estimate the size of rainwater tank required given a number of inputs and assumptions. It was developed by ATA (now I think called Renew).
It still says the website exists, but hasn't been loading for months now. Does anyone know anything about this? I've tried emailing them but they don't answer.
https://renew.org.au/resources/tankulat ... cumstances.
http://tankulator.ata.org.au/