The roadway data defined using the HY8 Roadway Data dialog includes information about the profile, crest and surface of the road for which the culvert is being analyzed. HY8 allows you to enter a constant elevation (the elevation should be referenced to the culvert invert elevation defined as part of the culvert data) or an irregular shape using from three to fifteen coordinates. The crest information, in conjunction with the surface condition (weir coefficient), completes the information needed by HY8 to perform the weir calculations when water overtops the roadway surface.
Related Topics:
Culvert Calculator with HY8