On Mon, Aug 30, 2010 at 10:35 PM, Pierre-Alain Dorange <[email protected]>wrote:
> > I'm not sure i have understand, but (for me) a culvert can't "carries a > road over" ; a culvert is a kind of tube that goes under a structure to > allow water to go throught a roadrail... > > Wikipedia for example tell : > "A culvert is a device used to channel water. It may be used to allow > water to pass underneath a road, railway, or embankment for example. > Culverts can be made of many different materials; steel, polyvinyl > chloride (PVC) and concrete are the most common." > <http://en.wikipedia.org/wiki/Culvert> > > And if you go ahead with this article: "When boxes or pipes are placed side-by-side to create a width of greater than twenty feet, the culvert is defined as a bridge in the United States" Some examples: http://www.horizontalholes.com/images/Box_Culvert_Job_09.jpg http://rscallahan.com/sitebuildercontent/sitebuilderpictures/May242006011.jpg Pieren
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