Actually, the south west corner of WA has about the most consistent rainfall in OZ. They may not get as much as brisbane on average, but it turns up without fail every winter.
However, Perth doesn't even have stormwater drains worth mentioning

that shocked me when I first got here. The gutters just run into soakwells (small holes in the ground) - if that! The rain just soaks into the sand - even that day a couple of years back when we got 100mm in 2 hrs - about the same as toowoomba got a couple of days ago.
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