You are exactly right, Sarah. NOAA Atlas 15, with updated precipitation-frequency predictions for the contiguous USA, is scheduled for preliminary release in 2025 and final publication on 2026. Meanwhile, my clients are asking what numbers they should use right now, knowing that Atlas 14 is seriously out of date. They want to be responsible, but they don't want to overdesign by a huge margin.
Original Message:
Sent: 12-26-2024 04:58 PM
From: Sarah Simon
Subject: Civil Engineering: The Art of Managing Risk
Thanks for the references.
We need to be careful these days about relying on 100 year flood categories. New weather prediction methods, which don't only rely on the past 50 years of weather and precip, show that what used to be called 1,000 year floods may now occur every 70 years. So no longer do "1,000" year floods occur once in many generations
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Sarah Simon P.E., M.ASCE
RETIRED
Ipswich MA
Original Message:
Sent: 12-26-2024 02:33 PM
From: Dilip Barua
Subject: Civil Engineering: The Art of Managing Risk
It is good that we're thinking about it. Here is what I like to add.
As I see it, uncertainty, probability or likelihood, and risk assessment and management – all belong to the Risk Envelope – Uncertainty and Risk.
There are at least two NAP publications I came across: The 2013 U.S EPA Env Decisions in the Face of Uncertainty # 12568; and The 2024 Advancing Risk Communication . . . Atypical Climate Events # 27933, that provide some great directions to Risk Assessment and Management.
The method of risk assessment, obtained as the product of the probability of occurrence of an event and the damage consequences of that event, is rather well-established. Estimating the probable but realistic damages and assigning financial values to them – have not been something easy to do (during the planning and design phases of a project) in the past. It is only the recent advances of GIS, mapping and remote sensing technologies – that have made the efforts easier, for example to estimate flood and storm surge damages.
There is also an easy assessment approach, called the method of Encounter Probability. It relates the return period (in years) of an event to the design life of a project. For example, the likelihood or probability that a 100-year event will be encountered during the 30-year design life is 26%.
Despite its simplicity, encounter probability reinforces the common notion of the design philosophy that – the longer the lifetime of a project – the stronger its components must be to withstand the long return-period events. It's a risk minimization step.
Dilip
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Dr. Dilip K Barua, Ph.D
Website Links and Profile
Original Message:
Sent: 12-23-2024 09:14 AM
From: William McAnally
Subject: Civil Engineering: The Art of Managing Risk
My encounters with project and regulatory engineers suggests widespread ignorance about risk management. They know the words, but not the principles and practices.
For example, I attended a public agency workshop on risk in which the organizers defined risk incorrectly as the "probability of adverse event occurrence," instead of the correct engineering definition that includes two distinct components in risk – the probability of an event and the magnitude of consequences from that event. Even ASCE Policy Statement 437 on Risk Management is fuzzy on the definition.
The U.S. National Research Council and International Standards Organization provide engineering practice guidance on risk and risk management consistent with the correct definition.
What more can be done? We can review ASCE's Continuing Education offerings and either create or promote those that teach true risk management. We can add a concise definition to Policy 437. We can encourage an article in ASCE magazine aimed at educating a general engineering audience.
Thanks for raising the issue, Mitch. It's important.
Bill Mc
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William McAnally Ph.D., P.E., BC.CE, BC.NE, F.ASCE
ENGINEER
Columbus MS
Original Message:
Sent: 12-16-2024 10:03 PM
From: Mitchell Winkler
Subject: Civil Engineering: The Art of Managing Risk
Risks are present in almost everything we touch as civil engineers. Civil Engineers implicitly manage risk through design and building codes and standards and explicitly through design choices and trade-offs. Are we doing enough to make the profession understand its role as a risk manager and what more needs to be done?
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Mitch Winkler P.E.(inactive), M.ASCE
Houston, TX
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