Required a historical and documentary study of the history of its water system and an archaeological investigation
It was decided that the full restoration of the Fountain of the Lions also required a historical and documentary study of the history of its water system and an archaeological investigation. This revealed that the water-system had been subject to continuous intervention over the centuries. It also confirmed that the various apparatuses and circuits were recent, except for in certain specific areas.
New pipes were installed for supplying water to the different fountains in the courtyard and for collecting the water circulating between them. The system by which the water passed through the Lions was also repaired, so that the water did not come into direct contact with the marble in the sculpture, so prolonging the lives of the pieces.
These various actions required a new system to be installed in the lower room of the pavilion so enabling a new set of pipes to be laid across the Courtyard. This also enabled the excavation and removal of obsolete materials installed in the Courtyard in the last third of the 20th Century.