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Evaluating Scour at Bridges - Fifth Edition (Hydraulic Engineering Circular No. 18) Colophon 2016 against every societyThis 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 contain updated material from previous editions and continued research by NCHRP, FHWA, State DOTs, and
