The model shows the imperial palace Ingelheim at the time of Charlemagne, which can be viewed in the permanent exhibition in the museum near the imperial palace., © Rainer Oppenheimer© Rainer Oppenheimer

Cross-section of water pipe
Internal width: approx. 0.45 m
Internal height to the top of the vault: approx. 1.10 m
External dimensions: 1.25 m total width, 1.50 m total height
Charlemagne's water pipe in the excavation findings. © Peter Haupt/Stadt Ingelheim