Definition of ABSCOUR Cross-Section

The ABSCOUR program utilizes the same equations to compute scour on bridge abutments and culvert walls. The sketches below are designed to assist the ABSCOUR user in determining the proper input values to use in the model.

Bridge Opening:

The hydraulic flow depth (yo) at the downstream side of the bridge equals A/T. The solid black line represents the bottom of the ABSCOUR cross section and the dashed brown line represents the existing bed elevation.

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Bottomless Culvert Opening:

The hydraulic flow depth (yo) at the downstream side of the bottomless culvert equals A/W. Notice that on the left overbank, the cross hatched area is equal to the light blue shaded area on the ABSCOUR cross section.

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