Federal Department of the Environment, Transport, Energy and Communications DETEC Federal Office for the Environment FOEN Hazard Prevention Division
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Federal Department of the Environment, Transport, Energy and Communications DETEC Federal Office for the Environment FOEN Hazard Prevention Division
Flood Risk Management in Switzerland Dr. Olivier Overney, Head of Flood Protection Section PLANALP Conference Graz
25th March 2014
Contents 1. Principles of integrated risk management 2. Implementation in a federal state 3. Example of the Rhone correction for integrated flood risk management 4. Conclusion
Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
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Contents 1. Principles of integrated risk management 2. Implementation in a federal state 3. Example of the Rhone correction for integrated flood risk management 4. Conclusion
Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
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Approaches to reduce risks
risk management: continuous assessment of risk situation as well as planning and realising protection measures Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
Retention of water Increase discharge capacity Maintenance of rivers
Use all chances to influence hazards and risks Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
Damages
Vulnerability
Crisis Management
Limit risks and damage
Adaptation of land use Emergency planning Forecasts Intervention
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Contents 1. Principles of integrated risk management 2. Implementation in a federal state 3. Example of the Rhone correction for integrated flood risk management 4. Conclusion
Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
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Task sharing in flood risk management • Federal authorities:
Legislation; policy; guidelines; financial support; support of research, education; warning and alerting
• Municipalities (2408): communal land use planning; building permissions, local emergency management
• Insurance:
mandatory insurance (all buildings), covering the remaining risk
• Property owner:
local protection; precautionary measures
Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
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Contents 1. Principles of integrated risk management 2. Implementation in a federal state 3. Example of the Rhone correction for integrated flood risk management 4. Conclusion
Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
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6 Priorities for Action 1. Comprehensive knowledge of hazards and risks 2. Increased awareness of natural hazards 3. Holistic planning of measures 4. Protective structures designed to accommodate excess loads 5. Emergency preparedness 6. Timely identification of hazard events Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
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Rehabilitation program of fluvial works Fluvial works from 19th and 20th Planned rehabilitation Completed rehabilitation
Rhône
Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
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1st Priority for Action Knowledge of hazards and risks • Hazard-appropriate behaviour in spatial planning • National level defines the legal framework and provides financial support • Provinces and communes are responsible for the compilation of hazards
Dambreak Inundation
High Medium Low
Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
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1st Priority for Action Knowledge of hazards and risks
3rd Priority for Action Holistic planning of measures Integrated management has to settle priorities for actions Measures must be adaptable to changing hazard situations There is a need for good cost-benefit relation Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
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Principles of hydraulic design • heightening levees
Ecological measures to integrate
• lowering river bed
Ecological measures to integrate
• widening river channel
Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
Ecological measures to integrate
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Favoured solution
Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
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Master Plan (PA-R3)
Supplementary river space = 870 ha (+60%) / 110 km Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
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4th Priority for Action Structures designed to accomodate excess load Old protective structures often fail in the „overload case“ Measures are needed to prevent an uncontrolled collapse in case of „overload situation“
Flood risk management in Switzerland| O.Overney PLANALP Conference Graz 25.3.2014
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Flood discharge management
Management of the overload case in Visp
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Flood discharge management Management of the residual risks Combination of : • Flood routing in river channel • Flood diversion • Flood corridor
