Was commuting through old G-Town when I spotted this, unfortunately I was in a bus and could move fast enough to grab a picture, so I tracked it back with Google street-view. It's about 1.4-1.7m in diameter and I've seen dozens since ranging from a few inches above the ground to three feet.
(looks strikingly similar to conning towers on old warships
)
Just wondering what exactly these things hide? They exist almost solely around gas lines and drains, yet they seem accessible through hatches on the top
Last time I lifted something that looked a lot like that it ended up being a bore water well (at Moore park golf course). I though I was onto a winner, but in the end it ended up being a 4ft deep pit full of murky water.
I count twenty all between a series of retarding basins across 5.5 kilometers in a built up area, maybe not bore? Though that's the best explanation so far
I think you'll find that these are valve pits for pipes linking the reservoirs near the uni to the ones at the top of the hill, used to live in G-town, pretty sure I remember where you have seen these...