The objective of this study is to compare the effect of pile groups on the local scour around bridge piers, while changing the pile number and spacing in both longitudinal and transversal directions. Different arrangements of square pile groups have been studied, where the pile numbers range from 2 to 9, and are separated by a clear spacing that ranges from 50 to 200mm. The numerical model “Sediment Simulation In Intakes with Multiblock Option” was used to evaluate different arrangements and their effect on the local scour.