Pier Scour in Coarse Bed Materials

This procedure is recommended for use within the limits of applicability described in the Utility. Under certain conditions, the method has been found to provide a more accurate estimate of pier scour than the standard pier scour equation which may over-estimate the depth of scour. The user is encouraged to compute pier scour with this method and with the standard pier scour equation in the Pier Scour Module, and then make a judgment as to the more reasonable number to use for the existing site conditions. See Section 7.11 Pier Scour in Coarse Bed Materials in the FHWA Manual HEC-18, Fifth Edition.