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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
Learning Objectives
- Understand the implications of the update to HEC-18
- Learn what to look for when reviewing scour reports
- Find where the resources to assist in bridge scour analyses are
Webinar Benefits
- Find out what is the most critical component of abutment scour
- Know the proper interpretation of bed sediment samples
- Determine how to apply long term scour in relation to the other scour components
- Be aware of the proper flood magnitude to use for countermeasures
- Understand how to apply scour components in the proper sequence.
- Find out if you are double counting the scour components
- Understand the advantages of using round piers properly spaced in a pier group
Intended Audience
- Anyone with a working knowledge of and understanding of the concepts of bridge scour
- Bride scour engineers
- Reviewers of bridge scour studies
- Hydraulic and hydrologic engineers
Webinar 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