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For most applications, normal round metal culvert pipe is recommended. But sometimes there is limited headroom or cover over the pipe, or higher hydraulic capacity with little runoff is preferred. Thus comes out the idea of corrugated metal culvert pipe arch. The low, wide design distributes the flow area horizontally, providing hydraulic capacity without raising the finish grade.
We don't fabricate aluminum products, so we mean the same when saying corrugated steel pipe arches. It is the economical options going with different finish coatings, zinc coating or polymer coating. We signify the dimension of corrugated steel pipe arch by span × rise as international conventions.