How to Say "culvert" in Spanish
The Spanish word for “culvert” is “alcantarilla” — C1 level.
English → SpanishC1
nounC1formal
a tunnel carrying a stream under a road

Examples
La carretera pasa sobre una pequeña alcantarilla de piedra.
The road passes over a small stone culvert.
Technical Usage
In this context, it describes a structure that acts like a tiny bridge for water.
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