A collection of papers on the archaeology of water installation from a session presented at the EAA conference in The Hague, September 2010. Contents: 1) Drainage system of the rainwater and the excess water discharged on the streets of Pompeii (Yoshiki Hori) 2) The cuniculi of Tuscania: the oracle down the well (Lorenzo Caponetti); 3) A social role of Roman baths