Rock Scour

  • Registration Closed

October 4 1-5pm

October 5 8-12pm


Scour of rock is a critical issue for dam safety and water conveyance structures. One of the many lessons learned from the 2017 Oroville spillway incidents was there is limited understanding in the industry of the rock scour process in addition to assessing the erodibility of dam foundations and spillways founded in rock. 

The first half of the workshop will provide the knowledge and understanding on the physical processes governing rock scour, what information is needed for a scour assessment, what current tools and methods are available to perform a scour assessment, and case histories illustrating the use and interpretation of the results of scour analyses. The second half of the workshop will focus on group evaluation of scour for two examples: a plunging jet and an unlined rock spillway channel.


Understanding of rock scour mechanisms and processes
Recognition of rock scour failure modes
Analytical tools for evaluation of rock scour and integration with RIDM framework
Project examples using various analytical approaches
Application of Erodibility Index and Block Theory Rock Erodibility Methods

Target Audience

Disciplines: geologists, geotechnical engineers, geological engineers, hydraulic engineers, dam safety engineers

Experience: Project level engineers and above

Event Location:

Auraria Campus — Tivoli Student Union

900 Auraria Pkwy.Denver, CO 80204


SpringHill Suites Denver Downtown

1190 Auraria Parkway Denver, Colorado 80204

USSD has a room block with a reduced rate

Booking Link:

Dr. George Annandale, P.E.


George W. Annandale, Inc.

Dr. Annandale has more than 40 years of experience as a civil engineer specializing in water resources engineering. He offers services in the field of fluvial hydraulics, design and engineering; reservoir and water supply management; and hydrology and hydraulics. He has published numerous peer-reviewed papers and is author, co-author and contributing author to eight books on sedimentation and scour. He was named by International Water Power and Dam Construction as one of 20 engineers who made a significant global contribution to dam engineering at commencement of the 21st century. Dr. Annandale is known for the development of the Erodibility Index Method that can be used to determine the erodibility of any earth material, including rock. The method has been accepted by the engineering profession, is used globally for design and safety assessment of infrastructure and is included in federal and state manuals and guidelines. The method is contained in guidelines by FERC, US Army Corps of Engineers, US Bureau of Reclamation, US Federal Highway Administration, Australian Dam Safety Authority, Electricite de France, French Gravity Dam Guidelines, and others. He authored the book "Scour Technology", published by McGraw-Hill in 2006, which has become a standard reference in this field of specialization. Dr. Annandale consults internationally and has worked on projects in more than 25 countries.

Dr. Mike George, P.E.

Geological Engineer

BGC Engineering

Dr. George is a geological engineer specializing in water resources and dam engineering with focus on foundation / spillway erodibility, scour remediation, rock mechanics, hydraulics, high-resolution remote sensing monitoring, and reliability methods. He has worked as a consulting engineer and researcher in the United States and abroad and has developed methodologies for evaluation of rock mass erodibility, delivered training to FERC/USACE on scour, and authored over 25 papers on the subject including sections of the recently updated FERC Engineering Guidelines for Arch Dams (2018). Dr. George is also co-chair to the newly formed International Working Group on Overflowing & Overtopping Erosion (IWGOOE) hosted through ICOLD.


Live In-Person Event
10/04/2023 at 1:00 PM (MDT)   |  23 hours  |  Attendance Required
10/04/2023 at 1:00 PM (MDT)   |  23 hours  |  Attendance Required
PDH Certificate
8.00 credits  |  Certificate available
8.00 credits  |  Certificate available
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Recorded 10/03/2023  |  5 minutes
Recorded 10/03/2023  |  5 minutes Please respond to the event survey