English: "Drain with width and breadth of 1 meter, its side walls polygonal masonry, with a tiled bottom and large covering slabs. Its purpose was to convey to Eridanus River waste from the buildings of the Agora and rainwater from the surrounding hills. Its main channel crosses the west side of the Agora from south to north beneath the paving of the "West Street". At the beginning of the 4th century B.C, two branches were added immediately south of the Tholos, one to the southeast and one to the southwest, to bring rainwater and waste from a broader section of the Agora into the main channel. In later antiquity, the statue of the emperor Hadrian, set up on the "West Street", was used as a cover slab for the drain." Text: Information board in the close vicinity of the drain.