canals/irrigation system

based off the the Mesopotamian water arches, although they're underground and they're like waterways that're suspended from the ceiling with a complicated pulley system that helps direct/reroute water channels so its actually not like the Mesopotamian water arches at all basically the system just recycles the same water suplpy over and over again from an extensive purification process the source is some mysterious opening in the mountain- the inhabitants believe its religious