EVALUATING SCOUR AT BRIDGES. SECOND EDITION

This is the second edition of Hydraulic Engineering Circular No. 18 (HEC-18). It contains updated material not included in the first edition dated February 1991 (see TRIS 608471). This document presents the state of knowledge and practice for the design, evaluation and inspection of bridges for scour. The February 1991 edition was an update of the publication, "Interim Procedures for Evaluating Scour at Bridges", issued in September 1988 as part of the FHWA Technical Advisory TA 5140.20, "Scour at Bridges". TA 5140.20 has since been superseded by TA 5140.23, "Evaluating Scour at Bridges", dated October 28, 1991. This circular contains revisions as a result of further scour related developments and use of the 1991 edition of HEC-18 by the highway community. The principal changes from the 1991 edition of HEC-18 are: the inclusion of a section on tidal scour with example problems; a comparison between Neill's equation for beginning of motion for coarse-bed material and an equation that results from Laursen's clear-water scour equation; clarification and simplification of the use of the clear-water and live-bed contraction scour equations; replacing the total scour example problem in Chapter 4 with a problem based on the results of a WSPRO analysis of a highway crossing; elimination of the computation of guide bank length in the appendices (the complete procedure is contained in HEC-20); inclusion of an updated version of North Carolina's scour evaluation procedures in Appendix D; replacing the scour analysis for Great Pee Dee River, South Carolina with the scour analysis for the South Platte River in Colorado in Appendix F; updating the information on scour detection equipment in the Appendix G; and correction of editorial and minor errors in the text and figures.

• Corporate Authors:

  Resource Consultants and Engineer, Incorporated

  3665 JFK Parkway, Building II, Suite 300
  Fort Collins, CO  United States  80525

  Federal Highway Administration

  Hydraulics and Geotechnical Branch, 1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Richardson, E V
  • Harrison, L J
  • Richardson, J R
  • Davis, S R
• Publication Date: 1993-2

Language

• English

Media Info

• Pagination: v.p.

Subject/Index Terms

• TRT Terms: Bridge design; Bridges; Highway bridges; Inspection; Scour; State of the art studies; Structural design
• Uncontrolled Terms: Underwater inspection
• Subject Areas: Bridges and other structures; Design; Highways; Hydraulics and Hydrology; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00675292
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Report/Paper Numbers: HEC 18 (2nd edition)
• Files: TRIS, USDOT
• Created Date: Mar 16 1995 12:00AM