Experiments of local scour around pile groups and wide piers are carried out under steady currents. Piers with large diameter and pile groups were arranged properly so that the scour process and maximum scour depth could be compared. Although numerous empirical formulas have been proposed to predict equilibrium scour depth around various bridge piers, there is still no general formula that satisfies all conditions. In addition, the scour characteristics of different types of structures are not clearly understood. This study observed the dynamic scour process and the scour depth of every case was determined. Comparisons of pile groups and wide piers were made to aid in the determination of the influence of several foundation types.
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