My DH and I toured Pompeii just a year or so before he died. That city had extremely sophisticated waterworks and sewer system. It's built on a hill, and the troughs for the fresh water and for the sewer were built specifically for each type of work--they had high (6" or so) walls so the contents would not spill over. In the roads, the chariots drove on elevated flat-topped rocks, so the rainwater or wastewater could run downhill between the rocks and no person need get his feet in the wet or in the mud.
But in some of the houses, the bodies were frozen in place -- or rather, melted into stone, in the middle of whatever act they were performing, just from the hot lava which came down from Vesuvius. It was an amazing place.
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Jeannie
...Change is inevitable; growth is optional....