Where does the water come from? How did people back in the day know there’s water there? How was it safe to drink if it was publicly accessible?
In: Engineering
On land surface water, like lakes, ponds, and rivers are the exception.
The earth captures most of the water, and it becomes underground water. Large quantities of water are trapped this way (very large quantities, like 99% of liquid fresh water is underground)
Water remains a liquid though, it will sometimes flow over the ground, to form lakes and rivers, but we can also dig all the way down to the height of the underground water and it will naturaly overflow in the hole and be accessible.
Wells do dry up if more water is consummed than what fills the ground. Which either requires to dig deeper to the new height of the water or dig a new well where the water height is still high enough.
Underground hydrology is quite complex though.
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