[Tagging] [OSM-talk] Culvert and average contributor

John F. Eldredge john at jfeldredge.com
Fri Aug 27 15:30:01 BST 2010

I have also seen what is usually termed a low-water bridge, where you have a concrete ford across a stream, with a culvert at the center.  If the water is low enough for the full flow to pass through the culvert, vehicles can cross without getting their tires wet.  At medium water levels, the crossing is a ford.  At high water levels, you can't cross the stream.

-------Original Email-------
Subject :Re: [OSM-talk] [Tagging]  Culvert and average contributor
From  :mailto:openstreetmap at jonno.cix.co.uk
Date  :Fri Aug 27 08:35:41 America/Chicago 2010

  On 27/08/2010 14:17, edodd at billiau.net wrote:
> In a town which does not have underground storm water management, the
> gutters at the side of the roads have to cross one of the roads at an
> intersection so you have a half-elliptical shaped culvert which traffic
> crosses, making a little ford. The wikipedia definition of culvert is
> simply "A culvert is a device used to channel water." and these fit into
> that definition.

Nice selective quoting. The full description is:

"A *culvert* is a device used to channel water. It may be used to allow
water to pass underneath a road <http://en.wikipedia.org/wiki/Road>,
railway <http://en.wikipedia.org/wiki/Railway>, or embankment
<http://en.wikipedia.org/wiki/Embankment_%28transportation%29> for
example. Culverts can be made of many different materials; steel
<http://en.wikipedia.org/wiki/Steel>, polyvinyl chloride
<http://en.wikipedia.org/wiki/Polyvinyl_chloride> (PVC) and concrete
<http://en.wikipedia.org/wiki/Concrete> are the most common. Formerly,
construction of stone culverts was common."

from http://en.wikipedia.org/wiki/Culvert

If the vehicle travels through the water, it's a ford, not a culvert --
the water is passing *over* the road, not under it.

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John F. Eldredge -- john at jfeldredge.com
"Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria

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