culvert

thumb|Stone culvert in Haapsalu, [[Estonia]] thumb|Steel culvert with a small plunge pool at its outflow thumb| Large box culvert on Rio Monterroso

A culvert is a structure that channels water past an obstacle or to a subterranean waterway. Typically embedded so as to be surrounded by soil, a culvert may be made from a pipe, reinforced concrete or other material. In the United Kingdom, the word can also be used for a longer artificially buried watercourse.