During a flood (at around 1250-1200 B.C.), a stream south of Tiryns moved towards the northern part. Hence to protect the lowest town from the future floods, the people of Tiryns constructed an artificial river diversion that was supported by a dam 10 m high, 300 m long and 1,5 m long canal. The dam is actually a huge earth levee that is in line with the transverse tectonics of the previous south river bank.

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