The Romans had constructed a cistern at the Roman fountains, having the shape of an artificial dam at a distance of 10 km from the fountains. Part of the initial dam wall is found incorporated into the base of the new cistern, while at a 20 km distance, in the river watercourse, there are several big parts of the walls. The Patras aqueduct was situated at a distance of 6,5 km from the cistern until the castle. The water was transferred via an underground aqueduct, getting over the valleys and the coulees, by means of well constructed archery works, parts of which are preserved until today. There were linkages towards several directions having a smaller diameter protected aqueduct. The continuous water flow was succeeded due to the principle of connecting vessels known by the Greeks.

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