Flow Depth Upstream Face of Pier
The flow depth immediately upstream of the bridge at the nose of the pier in feet (meters).
For most cases, the recommended approach is to select the pier within the limits of the estimated
channel lateral movement zone (CLMZ) with the worst-case conditions (velocity and flow depth) for
scour (typically at or near the channel thalweg). Design all piers within the CLMZ for this condition.