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Arneson, L.A. (author), Zevenbergen, L.W. (author), Lagasse, P.F. (author), Clopper, P.E. (author)This document is the fifth edition of HEC-18. It presents the state of knowledge and practice for the design, evaluation and inspection of bridges for scour. There are two companion documents, HEC-20 entitled "Stream Stability at Highway Structures", and HEC-23 entitled "Bridge Scour and Stream Instability Countermeasures". These three documents...report 2012