De quoi est fait citerne
A reservoir for storing water.
- Reservoir — a pour partie. A container for water.
- Waterproof plaster lining — a pour partie. Plaster on hydraulic mortar.
- Gutter — utilise. Water is collected from roofs and squares.
- Roman concrete — est fait de. Roman cisterns were built of concrete with hydraulic mortar.
- Stone — est fait de. Cisterns were cut into rock or lined with stone.
- Lime — est fait de. The walls were coated with lime plaster against leaks.