Case Studies - Wednesday, October 9

Case studies are included in the conference registration rate for full delegates.  Individuals can attend the conference for Wednesday only by purchasing a one-day conference registration.

10:30 a.m. to 12 p.m.

Case Study 1A: Flood Retention Structures and Rehabilitation (cont’d at 1:30 p.m.)

Despite continuous improvements in design, construction and operational practice, dam incidents and failures continue to occur for a variety of reasons including ageing infrastructure, natural disasters, and the effects of climate change. The regulatory landscape is also evolving in response to historic incidents, increasing dam safety practice globally. Much can be learned from these incidents to help further improve design, construction, operation, maintenance and rehabilitation practices, ultimately leading to updated standards, guidelines and regulations. 

This case study session offers attendees a unique opportunity to learn lessons from the recent flood incidents in Alberta and to understand the measures taken at all phases of their life cycle to increase public safety and societal and professional confidence, and to meet new regulatory requirements.  

Discussions also include how the inherent residual risks of these large engineered structures are being continuously and proactively managed to be As Low as Reasonably Practicable (ALARP) during a flood event, as well as transitioning to recovery. 

In this session, many seasoned veterans will present the following case studies: 

1. Design and Construction of Bassano Dam Emergency Spillway for Additional Discharge Capacity
2. Glenmore Dam Rehabilitation to Better Manage Extreme Events, Increase Operational Efficiency and Public Safety
3. The Johnson’s Island Fuse Plug Embankment Overtopping, Wash-out and its Rehabilitation.  Design, Construction and Performance of other Fuse Plugs in Alberta 
4. Design of Cougar Creek Debris Flood Retention Structure to Reduce the Flood Risk to the Town of Canmore
5. Managing Damages and Impacts during the Recent Flood at Barrier Lake and Transitioning to Recovery
6. A Review of Milk River Reservoir System Rehabilitations History and Risk Assessment - A New Approach for Dam Safety Decision Making

Technical tours are also available on many of these case study projects if the attendees want to deepen their knowledge and understanding on the issues discussed, lessons learned, and risk reduction measures implemented.

Case Study Presenter(s)

Case Study 1B: Management and Mitigation of Liquefaction Risks for Oil Sands Dams

Tailings from oil sands bitumen extraction are stored in out-of-pit and in-pit facilities contained by tailings dams. The Alberta oil sands industry has 1400 dam-years of safe operation of tailings dams. The potential for liquefaction of loose tailings was identified early in the engineering of oil sands tailings containment structures, and controls in the design, construction and operation of oil sands dams are implemented to mitigate the risk of liquefaction events.

This session will discuss:
* The precautionary approach used to manage the risks and effects of liquefaction in the oil sands tailings containment structures
* Methods for investigating and assessing the susceptibility of tailings deposits to liquefaction, including typical results
* Modelling and analysis techniques
* Methods for improving the resistance of tailings to liquefaction and mitigating liquefaction risks.

Case Study Presenter(s)
Joseph Quinn, Ph.D., P.Eng., P.Geo., Klohn Crippen Berger
Scott Martens, M.Eng., P.Eng., Canadian Natural Resources

1:30 p.m. to 3 p.m.

Case Study 2A: Flood Retention Structures and Rehabilitation (cont’d from 1A)

Case Study 2B: Decommissioning and Closure of Oil Sands Dams

Decommissioning and closure of dams of the oil sands Tailings Storage Facility (TSF) is an important part of mine reclamation.  While dam decommissioning is still an evolving topic, the oil sands mine operators had undertaken different initiatives for their closed dams towards achieving dam decommissioning objectives.  

A selected number of case studies from all major oil sands mine operators will be presented along with a discussion on the challenges and opportunities on dam decommissioning. 

Representative from Alberta Energy Regulator (AER) will also participate and will present regulatory context on this topic.    

Case Study Presenter(s)

3:30 p.m. to 4:30 p.m. 

Case Study 3: Alberta Dam Safety Regulation

Alberta Environment and Parks (AEP) published its new Dam and Canal Safety Directive (December 2018).  AEP will give an overview of the upcoming regulations with details on how the dam safety program will be implemented and monitored.

Case Study Presenter(s)
M. Javid Iqbal, M.A.Sc., P.Eng., Alberta Environment and Parks

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