Culvert Flow Width (W)

For a rectangular culvert, this is the top flow width. For an arch culvert, this will usually be the width at the spring line of the arch. In any case, use the maximum flow width for the section. Please note that this width needs to be subdivided into left overbank, channel and right overbank and measured normal to the flow to develop the ABSCOUR cross-section.

Click here to see the sketch of structure cross-section