Institute for Water Resources 2010. Qualitative Risk Assessment. Charles Yoe, PhD firstname.lastname@example.org. The Need. Manage risk intentionally Do better than has been done Qualitative risk assessment can be a viable option Partial assessments sometimes helpful (not all steps).
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Source: Risk evaluation of the health effects of mobile phone communication (10/2005) by Peter Wiedermann, Holger Schütz, and Albena Spangenberg
You are working a on a beneficial uses of dredged materials study that is using good
quality navigation maintenance dredging material to create wetlands in a wildlife refuge.
Over the last several decades 7000 acres of coastal wetlands have been lost.
You have limited budgets and no money for engineering studies. The risk of greatest concern is
that the wetlands will not be established. Your task is to decide where you will place the material
to establish wetlands. You will use hay bales to establish a containment structure adjacent to the
shoreline, then you will pump materials behind the bales, the emergent land will then be planted.
You will be ranking 20 different sites and you want to identify those sites with the greatest risk of
failure or, alternatively, with the greatest chance of success.
Using the methodology of the enhanced criteria hazard ranking method develop three criteria that
will help you to identify the most hazardous locations for these wetlands. Then define a high,
medium and low scenario for each of these criteria
Source: Assessing Environmental Risk, A Lecture to the Irish
Environmental Law Association By: L. M. Ó Cléirigh 29
Source: What’s wrong with risk Matrices? By Louis Anthony Cox, Risk Analysis Vol. 28 No.2, 2008
Recently, Congress passed the National Levee Safety Act, which for the first time directed the Corps
to inventory all private levees. In this case we have a programmatic level risk assessment and
management problem and we will never have detailed data and analysis for a full blown risk
assessment at every location.
Given that the levee assessment program is in its infancy, and given the reality of limited data over
time, use the ORM approach to devise probability and consequence categories that could be used
for an initial qualitative risk assessment of these levees once they are identified.
Age x Condition x Usage x Event
Economic Environmental Perceived
Damage Damage Damage
Charles Yoe, Ph.D.