A culvert is a tunnel that allows water to flow under a road, railroad, trail, or similar obstruction from one side to the other side.
They are typically embedded so as to be surrounded by soil, a culvert may be made from a pipe, reinforced concrete or other material.
In England the word can also be used for a longer artificially buried watercourse.
A structure that carries water above land is known as an aqueduct.
This culvert passes under the Leeds to Liverpool canal at this point and though it is dry now, it still flows in wet weather and the stream that used to flow though this culvert can still be found a few yards further away from the canal where it spring up.