This sign is currently used in the Netherlands to indicatie that a manhole or gully is part of a rai water infiltration device. In the old Roman Barbour of Rome , the city of Ostia many signs are visible with this emblem. In this case it is applied in the floor of a former bathing house.
Add pictures, background data Gemma jansen
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• Submitted 1961 projects• Expert at Water• Netherlands
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