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Abstract The safe and economical design of bridge piles requires accurate prediction of the maximumexpected depths ofscour of the stream bed around them. A maID cause ofconcernabout the stability of bridge foundations is the occurrence of scour around the piles. Scour at bridge piles may be defined as a local lowering in the bed elevation around the piles. A study of the local scour at piles groups was experimentally investigated. The case of six piles having the same diameter aligned with the flow direction in two rows altering the separation distance between the centerline of the three piles was established. The aim of the experimental study is the investigation of the preferable separation distance between three piles to reduce local scour around them to Its minimum value. |