The ABSCOUR estimating procedure is based on the consideration that the cross-section at the approach section remains constant in the reach between the approach section and the bridge. Select the upstream model cross-section with this consideration in mind. However, the ABSCOUR program does take into account whether there is water behind the abutments in determining the extent of abutment scour. For bridges located on bends, the distribution of contraction scour needs to be assessed with regard to the effect of bendway scour (7).
Verify that values used for y (depth), V (velocity), W (width), q (discharge per foot of width) and Q (discharge) are consistent to assure that Q = VA (where A = W*y ) and q = V*y for each cross-section subarea.
Click here to see the sketch for sections
Click here to the the profile through the bridge