the dictinection between culverts and storm sewers is made mostly on the basis of length and the types of inlets and outlets. A culvert is defined as an enclosed channel serving as a continuation or substitute for an open stream, where that stream meets an artificial barrier such as a roadway, embankment, or levee.  Culverts are usually less than 60 m in length. A culvert may also be classified as a type of bridge. Normally, the rigid definition of a bridge requires that the deck of the structure also be the roadway surface, and simply an extension of the roadway. the use of corrugated steel pipe-arches, large diameter pipe-arches, structural plate, and corrugrl steel box culverts have played a major role as replacements for deteriorated bridges and altered this conventional definition

 

سازه قوسی فلزی آبرو
سازه قوسی فلزی آبرو
 
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