A tunnel under the Reading Railroad that a stream flows through is an example of a culvert.
When you build an enclosed tunnel under Reading Railroad to force a stream to pass underneath the railroad, this is an example of when you culvert the stream.
Origin of culvert
- Origin unknown
From American Heritage Dictionary of the English Language, 5th Edition
- Obscure, possibly dialect or related to the name of the long-forgotten inventor, or possibly from French couvert ("covered"), although couvert cannot be used in the same way, and the introduction of an l to make the English word is difficult to explain.