Along the axis of the street there obviously was a kind of canal where water flowed from central fountains. I saw this most clearly in Perge.

On the main axis of the street through the gate, about 7 m. within the city, the remains of a semi-circular pool can be seen. This stands at the bottom of a ‘waterfall’ which consisted of a series of tanks, 2 meters wide and 0,80 m high. These rose up the hill to the Decumanus Maximus (the main east-west-oriented road of the city), and water flowed down the hill from tank to tank.

Correspondent: J.M.Criel, Antwerpen.
Source: ‘Pisidian Antioch’ – Ünal Demirer, archaeologist. (Ankara, 1997).