Canadian Dam Association Bulletin - Fall 2017 - 27

risks. This provides to the owners a
road map for improvements to their
dams.
The approach discussed in this
paper does not replace detailed
analyses for a single dam, but
aims at providing decision makers with solid portfolio information. Among other things, the
following benefits were gained:
clear decision-making, transparency, optimum resource allocation,
improvements in internal and external

communications, and rational inclusion of lessons learned.
■

7. REFERENCES
ANCOLD (2011). Guidelines on Tailings Dams
Planning, Design, Construction, Operation
and Closure, May 2011.
Ang, A. H-S., Tang, W. H. (1975). Probability
Concepts in Engineering Planning and Design,
34 Vol. I, Wiley, United States, 1975.
Ang, A. H-S., Tang, W. H. (1984). Probability
Concepts in Engineering Planning and Design,
2 Vol. II, Wiley, United States, 1984.

Figure 7. Dams 9 and 12 represent the
99% of the intolerable risks of the entire
portfolio: thus, the road map to rational risk
mitigation is clearly identified.

approaches calibrated on data availability, size of the portfolio, and available budget. The initial estimate may
be modified by additional data coming
in later.
It is possible to include new data, as
it becomes available, in the portfolio
analysis by using well-known mathematical techniques. Additional elements can be included in the analyses:
* pond size and water distance to
crest, deformations, presence of
wet spots, and weather forecasts
are modifiers in the probability
of failure;
* downstream topography and land
use, as well as presence of downstream residents enter in the evaluation of potential consequences
of a failure.
With their detailed quantitative
results, drone and satellite imagery
can be integrated in the ORE logic.
This information comes in at the top
left box in Figure 2 to deliver updates.
These time-related changes might
modify risks at the dam portfolio level.

Brookfield Renewable
A sustainable presence

.
Proud owner, operator and developer
of renewable energy facilities in Canada
and around the world.

6. CONCLUSIONS
Risk assessment for a portfolio of fifteen tailings dams has been performed
using Optimum Risk Estimates, ORE,
from Oboni Riskope Associates. A risk
tolerance curve was developed for the
owner of the dams. Societal acceptability thresholds were considered.
Prioritization identified two dams as
amounting to 99% of the intolerable
Canadian Dam Association * Fall 2017

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Table of Contents for the Digital Edition of Canadian Dam Association Bulletin - Fall 2017

Board of Directors
President’s Message
2018 Board of Directors Update
2017 CDA Awards
Screening Level Risk Assessment for a Portfolio of Tailings Dams
Dam Safety Review, Public Safety Workshops Hit the Road
CDA Events Photospread
Gardiner Dam 50th Anniversary
Jim’s Journey – Memoirs by Jim Gordon
CDA Launches Digital Editions of Guidelines
Invitation From Icold 2018 in Vienna
Icold Corner
Notice of the Annual General Meeting
Ouranos Press Release – 2017 Spring Floods in Quebec
CDA Young Professionals
CDA 2018 Conference
Time to Renew Your Membership
CDA News Brief
Buyers’ Guide and Trade List
Canadian Dam Association Bulletin - Fall 2017 - Intro
Canadian Dam Association Bulletin - Fall 2017 - cover1
Canadian Dam Association Bulletin - Fall 2017 - cover2
Canadian Dam Association Bulletin - Fall 2017 - 3
Canadian Dam Association Bulletin - Fall 2017 - 4
Canadian Dam Association Bulletin - Fall 2017 - 5
Canadian Dam Association Bulletin - Fall 2017 - 6
Canadian Dam Association Bulletin - Fall 2017 - Board of Directors
Canadian Dam Association Bulletin - Fall 2017 - 8
Canadian Dam Association Bulletin - Fall 2017 - President’s Message
Canadian Dam Association Bulletin - Fall 2017 - 10
Canadian Dam Association Bulletin - Fall 2017 - 11
Canadian Dam Association Bulletin - Fall 2017 - 12
Canadian Dam Association Bulletin - Fall 2017 - 13
Canadian Dam Association Bulletin - Fall 2017 - 2018 Board of Directors Update
Canadian Dam Association Bulletin - Fall 2017 - 2017 CDA Awards
Canadian Dam Association Bulletin - Fall 2017 - Screening Level Risk Assessment for a Portfolio of Tailings Dams
Canadian Dam Association Bulletin - Fall 2017 - 17
Canadian Dam Association Bulletin - Fall 2017 - 18
Canadian Dam Association Bulletin - Fall 2017 - 19
Canadian Dam Association Bulletin - Fall 2017 - 20
Canadian Dam Association Bulletin - Fall 2017 - 21
Canadian Dam Association Bulletin - Fall 2017 - 22
Canadian Dam Association Bulletin - Fall 2017 - 23
Canadian Dam Association Bulletin - Fall 2017 - 24
Canadian Dam Association Bulletin - Fall 2017 - 25
Canadian Dam Association Bulletin - Fall 2017 - 26
Canadian Dam Association Bulletin - Fall 2017 - 27
Canadian Dam Association Bulletin - Fall 2017 - 28
Canadian Dam Association Bulletin - Fall 2017 - 29
Canadian Dam Association Bulletin - Fall 2017 - Dam Safety Review, Public Safety Workshops Hit the Road
Canadian Dam Association Bulletin - Fall 2017 - 31
Canadian Dam Association Bulletin - Fall 2017 - 32
Canadian Dam Association Bulletin - Fall 2017 - 33
Canadian Dam Association Bulletin - Fall 2017 - CDA Events Photospread
Canadian Dam Association Bulletin - Fall 2017 - Gardiner Dam 50th Anniversary
Canadian Dam Association Bulletin - Fall 2017 - 36
Canadian Dam Association Bulletin - Fall 2017 - 37
Canadian Dam Association Bulletin - Fall 2017 - Jim’s Journey – Memoirs by Jim Gordon
Canadian Dam Association Bulletin - Fall 2017 - CDA Launches Digital Editions of Guidelines
Canadian Dam Association Bulletin - Fall 2017 - Invitation From Icold 2018 in Vienna
Canadian Dam Association Bulletin - Fall 2017 - Icold Corner
Canadian Dam Association Bulletin - Fall 2017 - 42
Canadian Dam Association Bulletin - Fall 2017 - Notice of the Annual General Meeting
Canadian Dam Association Bulletin - Fall 2017 - Ouranos Press Release – 2017 Spring Floods in Quebec
Canadian Dam Association Bulletin - Fall 2017 - 45
Canadian Dam Association Bulletin - Fall 2017 - CDA Young Professionals
Canadian Dam Association Bulletin - Fall 2017 - 47
Canadian Dam Association Bulletin - Fall 2017 - CDA 2018 Conference
Canadian Dam Association Bulletin - Fall 2017 - 49
Canadian Dam Association Bulletin - Fall 2017 - Time to Renew Your Membership
Canadian Dam Association Bulletin - Fall 2017 - CDA News Brief
Canadian Dam Association Bulletin - Fall 2017 - 52
Canadian Dam Association Bulletin - Fall 2017 - 53
Canadian Dam Association Bulletin - Fall 2017 - Buyers’ Guide and Trade List
Canadian Dam Association Bulletin - Fall 2017 - cover3
Canadian Dam Association Bulletin - Fall 2017 - cover4
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