Changes

Irrigation and water technologies have been critical to human societies for millennia. The first great use of water technologies probably began soon after the development of settled societies. However, as societies became more complex, that is larger cities developed, and technologies, such as iron, and mathematics improved, we begin to see far more sophisticated use of water technologies. In fact, qanats and aqueducts, both invented probably by the Iron Age in the early 1st millennium BC, are still in use today, showing the durability of this technology. Some qanats and aquaducts used today, in fact, date to the Roman period.