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By Richard G. (Marseille, France) on 21 Feb. 2020 :
By Régine G. (Marseille, France) on 19 Feb. 2020 :
By - D. (Koenigsmacker, France) on 19 Feb. 2020 :
In case of severe weather such as a thunderstorm, the control tank can limit the flow of water. In the case of heavy rainfall, the water enters the tank with a maximum flow and leaves the tank at the top with a perfectly controlled flow.