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<br />I <br />I' <br />. , <br /> <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I- <br />I <br /> <br />PREFACE <br /> <br />These interim procedures for evaluating scour at bridges are being provided at <br />this time for guidance on agency recommendations regarding the design and <br />inspection of bridges for scour. This information will be incorporated in the <br />FHWA publication, "Hydraulic EngIneering Circular No. 18 (HEC-18), Scour at <br />Bridges,. which is scheduled for publication in 1989. <br /> <br /> TABlE Of COIITENTS <br />Chapter Page <br />1. Introduction . . . . . . . . . . . . . . . . . . . 1 <br />2. Basic Concepts and Definitions of Scour. . . . . . . . 3 <br />3. Designing Bridges to Resist Scour. . . . . . . . . . 11 <br />4. EstImatIng Scour at Bridges. . . . . . . . . . . . . 17 <br />S. EvaluatIng the Vulnerability of Existing Bridges to Scour. . . 4S <br />6. Inspecting Bridges . . . . . . . . . . . . . . . . . . . . . . Sl <br />7. Plan of Action for Installing Scour Countermeasures. . S9 <br /> References . . . . . . . . . . . . . . . . . . . . . . . . 63 <br /> <br />Append Ix A <br />B <br />C <br />o <br />E <br /> <br />Model Scour Study <br />MN DOT Bridge Scour Study (Tentative Procedures) <br />Proposed Revisions to the FHWA RecordIng Guide for <br />Structural Inventory and Appraisal of the Nations Bridges <br />SC DOT Scour Analysis for Great Pee Dee River <br />Scour Detection Equipment <br />