Accueil | Réalisations | Savoir-faire | Maquette | Une manipe en eau servant à expérimenter le principe du siphon
Quand la vallée est large ou profonde, la seule construction d’un pont-canal ne suffit pas. Pour franchir l’obstacle les ingénieurs romains ont eu recours à la technique du siphon.
Ce système fonctionne sur le principe des vases communicants. L’eau acheminée dans un bassin situé en amont (le réservoir de chasse) descend au fond de la vallée qu’elle franchit sur un pont-siphon. Sous l’effet de la pression elle remonte de l’autre coté, légèrement plus bas, jusqu’au bassin de réception (le réservoir de fuite) avant de retrouver son écoulement naturel.
Pour le comprendre, une manipe en eau invite les visiteurs à expérimenter le principe du siphon inversé.
Elle modélise schématiquement une canalisation en forme de U et laisse voir comment l’eau traverse le conduit d’une extrémité à l’autre remontant presque au même niveau ; la petite différence que l’on observe s’explique par les frottements et correspond à ce que l’on appelle une perte de charge.
Cette manipe a été réalisée à l’occasion de l’exposition « Aqua l’invention des romains ».
En savoir plus : Lugdunum Musée et Théâtres romains
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