Plot Scour Cross-Section

The following guidance is provided with regard to drawing the scour cross-section.

  1. For vertical wall abutments, the preferred method is to plot values of y2 under the bridge, measuring down from the water surface at the downstream side of the bridge.

  2. For an abutment on a spill through slope, draw an arc with center at the toe of the abutment slope and with a radius equals the abutment scour depth. The arc represents the possible sliding surface of the soil on the slope and also represents the possible scour hole.