The western world was a very dry land. It was a place where deserts were very prominent, and water was scarce. Thus, the people who lived in this time needed to dwell near water. When the population in these areas increased, there was a need to expand. With this expanse, they moved farther away from the rivers and water sources. This meant that there needed to be some advancement that would allow them to move the water from the source to the outskirts of their civilization.
Robert MaC. Adams used a map in "Heartland of Cities; Surveys of Ancient Settlements and Land Use on the Central Floodplains
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