Hey thanks Mick for the fascinating history of water in Melbourne city. One of the background reasons I took up photography was to expand my horizons in as many fields as I could manage and this, though not immediately useful, is interesting.
In my neck of the woods, the Blue Mountains. a World Heritage Area, we are cautioned against drinking the water from the creeks in the bushland because of village run off. Fortunately it doesn't result from horse dunnies, so there's hope.
Regards - Ross