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INSTRUCTOR: 
David T. Williams, Ph.D., P.E., PH, CPESC, F.EWRI, F.ASCE

Purpose and Background

The original defining document on bridge scour, Hydraulic Engineering Circular No. 18 (HEC-18) was released in 2001. Many engineers relied upon that document for numerous bridge scour analyses since that time. In 2012, an update of HEC-18 was released, but many engineers did not examine it in terms of the major additions and changes to the original document. This webinar points out those additions and changes and how to properly use the information. The webinar instructor also presents what to for when reviewing bridge scour analyses and provides guidance on issues that are based upon his over 30 years in the bridge scour field.

Primary Discussion Topics

• Analyses of debris built-up on piers and pier groups
• Determining “effective” and “equivalent” pier lengths
• Alignment of cross sections for abutment and contraction scour

Benefits and Learning Outcomes

Upon completion of this course, you will be able to:

• Explain the implications of the update to HEC-18
• Effectively read scour reports
• Locate the resources to assist in bridge scour analyses
• Explain the most critical component of abutment scour
• Interpret bed sediment samples
• Determine how to apply long term scour in relation to the other scour components
• Explain the proper flood magnitude to use for countermeasures
• Apply scour components in the proper sequence
• Recognize if you are double counting the scour components
• List the advantages of using round piers properly spaced in a pier group

Assessment of Learning Outcomes

Students' achievement of the learning outcomes will be assessed via a short post-assessment (true-false, multiple choice and fill in the blank questions).

Who Should Attend?

• Anyone with a working knowledge of HEC-RAS and understanding of the concepts of bridge scour
• Bride scour engineers
• Reviewers of bridge scour studies
• Hydraulic and hydrologic engineers

Outline

• Modeling debris on piers
• Complex piers
• Abutment slope
• Multiple pier columns and flow skew
• Top width of scour hole
• Pressure flow under bridges
• Miscellaneous observations
• Final comments
• Resources related to bridge scour

How to Earn your CEUs/PDHs

This webinar workshop is worth .2 CEUs/2 PDHs. To receive your certificate of completion, you will need to complete a short on-line post-test and receive a passing score of 70% or higher within 60 days of the virtual workshop.