Synonyms of 'culvert'
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A channel is a passage along which water flows.
Keep the drainage channel clear.
A conduit is a small tunnel, pipe, or channel through which water or electrical wires go.
He saw that the conduit was choked with rubbish.
Thesaurus for culvert from the Collins English Thesaurus
A culvert is a water pipe or sewer that crosses under a road or railway.