Public sanitation began with the Roman Empire. The problem with ever present human waste is obvious, and they developed the first sewers.
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Frank Jacobson invented the sanitation in 1000 years ago in the ancient times
Romans
i think it was the Romans
Grim, smelly, overrun with rats, no sanitation, muddy streets, completely foul, and cities and towns were not a lot better.
The Romans built most of their aqueducts underground because that was the most practical and efficient way to move the water. Underground structures needed less labor to build and less maintenance as they were not subject to the elements. Also, in some areas underground aqueducts were necessary because water flows down. If a hill or mountain intervenes, it might make the aqueduct impractical unless it were made underground to go through a hill or slope.