This kind of system was used during the rule of Emperor Tiberius (14-37 AD) to supply water to the city of Baetulo . The barrel vaulted tunnel is paved with opus signinum (lime and terra-cotta fragments). The water coming from the mountains (Serralada de Marina) to the city, was transported through such supply systems and would stop at private houses, as the House of the Dolphins, near the canal, nurturing reaching the hot springs and sources, allowing distribute water among its citizens.

This conduit, 40m of which can be visited, is the only example of its kind visitable in Catalonia.