Culvert

[Trillipse]

Now then, my friend has a bit of an obsession with a type of geographical/topographical feature known as a culvert. try as i might, i can't find a good definition.

anyone got any knowledge about this sort of thing?

[Emily Ball]

A culvert is basically a covered channel for the drainage of water , often under roads.

[sddsddean]

To expand on Emilys answer, in engineering terms a culvert is any covered channel for the transportation of fluid (usually water). This can range from a drain under a country road to full size rivers. The River Fleet in London rises near Hampstead and empties into the Thames at Blackfriars, about 8 miles away and is now culverted for its whole length.