Found basically in the middle of bushland in suburban Brisbane. To get here requires walking through overrun dirt paths that pretty clearly haven't been visited in a long while.
How tall is it? It could be a water sampling station ,I've made similar looking things that sit in the middle of the bush, tapped into the water mains that run underground so they can get water samples for testing, but there usually only waist height.
BCC == Brisbane city council?
Did you call the phone number?
My wild ass guess would be that it's a gauge for measuring water levels, with the upper opening part being a scale to read a marker that moves up and down the pole.
Does it line up with anything on this map of Brisbane water/sewer infrastructure? That map seems likely to give you at least an idea of what system it's associated with, and might even give more of a clue about the purpose of this specific point.
Calling the number put me on hold sadly, no additional info there. But it seems you have the answer anyway, so I am at peace now.
It's a flood gauge, it's a very simple gauge, they check it after a flood occurs.
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