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Halcrow.com Risk-Based Coastal Asset Management Adam Hosking Louise Trim Ben Hamer Richard Harpin Gulf Coast Hurricane Preparedness, Response, Recovery.

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Presentation on theme: "Halcrow.com Risk-Based Coastal Asset Management Adam Hosking Louise Trim Ben Hamer Richard Harpin Gulf Coast Hurricane Preparedness, Response, Recovery."— Presentation transcript:

1 halcrow.com Risk-Based Coastal Asset Management Adam Hosking Louise Trim Ben Hamer Richard Harpin Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. November 11-14, 2008

2 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Outline UK Strategic Risk Analysis Applications of approach Asset Management System Conclusions

3 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Strategic Risk Analysis in the UK

4 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Risk Management - Background In UK 5 million people in 2 million homes live in flood risk areas Over 120,000 residential and commercial properties at erosion risk Significant geographic variation Widespread flooding experienced in 1998 and 2000 Lessons Learned led to an enhanced emphasis on flood risk management UK Government Flood & Erosion Risk Management Objective: In order to ensure the best use of public money, target spending in those areas of greatest flood risk, whilst seeking to maximise the return on investment in terms of reduction of flood risk.

5 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Risk Assessment for Strategic Planning (RASP) (HR Wallingford, 2001) Structured approach to the analysis and management of the flooding system Focus on risk, explicitly recognising that defences and flood plains perform as systems

6 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Analysis Philosophy Performance of flood risk structures represented as fragility curves Relates loading on an asset to the conditional probability of failure of that asset given that loading.

7 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Predicting to flooding pathway True Fragility Curve RASP Based on: field inspections, empirical models, limit state equations, expert judgement Developed for approx. 60 generic asset types

8 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Asset Condition Grades Five condition grades Based on asset performance, not just traditional condition.

9 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Load Probability Source Probability of failure Load Pathway Damage Receptor Depth The Analytical Approach

10 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Performance-based Asset Management System (PAMS) PAMS project: Developing performance-based approach to identifying and prioritizing management of flood defences Ongoing studies, including: –Improved failure mode analysis to determine key performance features, and hence condition grade –Local applications to determine site specific fragility curves

11 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Applications of approach

12 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Tiered Approach (HR Wallingford, 2002)

13 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Application of RASP Set-up within GIS National Assessments: –2002, 05, 06 & 08 –2004 Foresight Future Flooding Used to inform policy and decision making Provide consistent national flood risk mapping (public access) Local scale assessments: –Project development –Assist in the planning maintenance and replacement of assets

14 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Asset Management System

15 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Based on existing GIS data platform (SANDS) Import, visualize and manipulate asset data Basis for consistent data capture Record asset types and condition, hence fragility Identify asset systems Link assets to risk areas and receptors Use cost models to optimise investment strategies Asset Management System (AMS)

16 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , Base mapping 2.Asset inventory 3.Relationship between loading and asset condition (fragility curve) 4.Cost models for upgrading from different condition grades (hence improving performance) for a given asset type 5.Flood extent and receptor data Key Components of System

17 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 System Components

18 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 System Components

19 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 System Components

20 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 System Components

21 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 System Components

22 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 System Components

23 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Use of optimization engine to automate decision- making Tool to provide user with top ten outcomes (against multi-criteria objectives), to enable considered selection of preferred option Possible development for use at higher, regional & national level to inform policy makers and budget setters Ongoing Development

24 Gulf Coast Hurricane Preparedness, Response, Recovery & Rebuilding Conference. Mobile, AL. Nov , 2008 Benefits of Risk-based Asset Management: –provides for systematic and co-ordinated approach to asset management –requires comprehensive asset information (facilitates collection) –focus on asset function and reduction of risk –avoid surprises (physical or financial) –evidence-based decision-making Conclusions AMS benefits: –built on established database platform –consistent data storage and analysis –facilitates improved decision-making –maximize risk management benefits from finite budgets

25 halcrow.com THANK YOU! Adam Hosking Halcrow Inc, Tampa, FL Tel: (813)


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