April 2025 Webinar: Repair and Retrofit of Concrete Dams

Includes a Live Web Event on 04/17/2025 at 10:00 AM (MDT)

As we become more aware of the risks that concrete dams pose; from aging, deterioration, hazard increases, population growth, changes to practice, and other factors; it is often necessary to construct risk reduction measures. In this webinar, we discuss different ways that this has been accomplished over the past 40 years or so, including the following:

· Grouting (with some possible cautions to be aware of)

· Drainage (from drilled holes, drainage adits, and other methods)

· Buttressing and overlays (using conventional concrete and RCC)

· Tendons and Rock Bolts (including considerations on drilling, tensioning, and corrosion)

· Dam raises using conventional concrete and RCC

· Overtopping protection for abutments and foundations

· Excavation within concrete structures, including blasting, wire saw cutting, and other methods

· Repair of cracks and ruptured water stops

· Adding or restoring outlet capacity (including considerations for lake taps)

· Spillway modifications to ensure proper functioning (including air slots and reducing stagnation pressures)

· Cross-canyon stabilization of buttress dams

Gregg A Scott, P.E., F. ASCE

Scott Consulting, LLC

Mr. Scott received his B.S. and M.S. degrees in Civil Engineering from the University of Colorado, Boulder. He started his career with the Bureau of Reclamation in 1976, where he worked for 34 years before joining the U.S. Army Corps of Engineers Risk Management Center as Lead Civil Engineer, where he worked through 2018. He has been involved with design, analysis, and construction of dams and dam safety projects, as well as the development and application of potential failure mode analysis and risk analysis for dam safety. He served on several review panels for Bureau of Reclamation and Corps of Engineers dam construction and dam safety projects. He has authored over 35 technical papers in journals and conference proceedings related to dam safety and dam engineering. He is now retired from Federal service, but continues to consult on a limited basis.

Bill Fiedler, P.E.

Senior Technical Advisor

HDR

Bill has 42 years’ experience in hydraulic and structural engineering designs for concrete dams and appurtenant structures, with the Bureau of Reclamation. While with Reclamation, he served as a technical specialist and design team leader for numerous water resource projects. In the later part of his career, he served as a member of Reclamation’s three-person Risk Advisory Team, which was responsible for developing additional risk analysis methodologies and providing training for Reclamation.

staff. Bill has particular expertise in concrete dam and spillway modifications, including: project planning and design coordination; analysis and design of structural modifications; review of design drawings and specifications; construction support; and risk analysis methodologies and facilitation. He has written numerous papers focused on dam safety evaluations and dam safety modifications. He was a lead author on a Reclamation manual focused on drains for dams and on a FEMA manual focused on flood overtopping protection for dams. For the past two years, he has worked as a consultant in the role of senior technical advisor.