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Flood Risk

Flood Risk

Zoran Vojinovic

(2015)

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Book Details

Abstract

According to the International Disaster Database (EM-DAT), over the last seventy years, floods have shown the fastest rate of increase relative to any other type of disasters. Devastation due to these events occurs almost daily. Even though our technological capabilities for dealing with floods have advanced rapidly over the same period, and while global economic growth per capita has doubled, flood events have become ever more disastrous. Does this mean that our technological developments have advanced independently from the social and wider ecological needs? 
Flood Risk: The Holistic Perspective is a direct response to this question and it argues that this paradoxical situation is a result from our narrow and fragmented perception of reality which has been characteristic of our academic disciplines and government agencies. It suggests that the way forward can be found only if we broaden our view and learn how the natural or social phenomena can provoke a response in a society, or a social group, which in turn can trigger the technical developments, and so on, again and again, in what has the potential to become a network of interactions and relationships through positive feedback (or coevolving) cycles. The holistic perspective however may raise the following question: If everything is connected to everything else, how can we ever hope to understand anything? Our response draws from the understandings brought by complexity theory where individual elements coevolve together both in development and application. This recognition opens a new analysis which goes beyond the direct objects or actors of concern (risk forecasting, early warning, land-use planning technology and systems for example), and into the relationships between them. The book suggests that our initial response to this and many other challenges is to change our perception from a disciplinary and defensive one to a progressive (or transcendental) and transdiciplinary, i.e., the one that turns challenges into the possibilities that can re-shape our future. 
The book is structured in eight chapters. Chapter 1 provides exposure to the complexity of flood-related issues and illustrates diversity of multiple points of view. Chapter 2 elaborates on the history of holistic thinking with connection to the flood resilience process. Chapter 3 discusses the holistic risk governance approach which progresses beyond the integrated urban flood management. Chapter 4 describes the Green Cities Initiative, an initiative which is essentially holistic in its nature as it aims to improve transport, energy efficiency, industrial metabolism including water supply and distribution as well as drainage and sewerage services through the holistic lens of interactions between different sectors. Chapter 5 discusses various risk assessment practices and it concludes that any practice that omits social, ethical and wider ecological points of view will be severely restricted in its scope and its reach. Chapter 6 describes the root causes of floods in the Pasig-Marikina River Basin in Metro Manila, Philippines. Chapter 7 reflects upon the key issues and challenges from 2011 Thailand floods. Finally, Chapter 8 presents some of the key aspects concerning urban stormwater management practice in Beijing, China.  

Table of Contents

Section Title Page Action Price
Cover Cover
Contents vii
Foreword by Michael B. Abbott xi
Foreword by Kuniyoshi Takeuchi xiii
Preface xv
Acknowledgements xix
Chapter 1: Floods in urban areas 1
1.1 SETTING THE SCENE 1
1.2 ON VALUES AND QUALITIES 5
1.3 PAVING THE WAY FORWARD: SHIFTING THE FOCUS 6
1.4 DIFFERENTIATING BETWEEN DIFFERENT TYPES OF FLOODS AND THEIR IMPACTS 10
1.5 THE NEED FOR ADAPTATION CALLS FOR HOLISTIC APPROACHES 14
1.6 TOWARDS A NEW ECONOMIC PARADIGM: ECONOMICS, ETHICS AND WELLBEING 19
Chapter 2: Holistic thinking 23
2.1 THE RISE OF HOLISTIC THINKING 23
2.2 FROM THE PARTS TO THE WHOLE 27
2.3 TRACING THE ROOTS OF URBAN FLOOD RISK FROM FOUR LEVELS OF THE WHOLE 29
2.4 MATHEMATICS OF COMPLEXITY AND INTERACTIONS 33
Chapter 3: Moving beyond traditional practices 39
3.1 TOWARDS HOLISTIC PLANNING FOR FLOOD RESILIENCE 39
3.2 SYNERGY WITH ECOSYSTEM SERVICES 45
3.3 GOOD GOVERNANCE FOR HOLISTIC PLANNING 48
3.4 THE ABC FRAMEWORK FOR IMPLEMENTATION OF HOLISTIC APPROACHES 55
Chapter 4: A. Holistic risk assessment 57
4.1 THE PURPOSE OF THE HOLISTIC FLOOD RISK ASSESSMENT 57
4.2 DATA GATHERING 58
4.3 ROOT CAUSES 60
4.4 DIAGNOSTICS 63
4.4.1 Assessment of hazards 64
4.4.2 Assessment of vulnerabilities 65
4.4.3 Assessment of impacts 67
4.4.4 Quantitative assessment of risk 70
4.4.5 Qualitative assessment of risk 71
4.4.6 Combining quantitative and qualitative data and methods into holistic frameworks 74
4.5 UNCERTAINTY IN FLOOD RISK ASSESSMENT 74
4.6 RECOGNITION – RAISING RISK AWARENESS 75
4.6.1 Methods for raising hazard/risk awareness 77
4.6.1.1 Flood maps 77
4.6.1.2 Flood symbols and tools 79
4.6.1.3 Public events 79
Chapter 5: B. Holistic scenario analysis 81
5.1 THE PURPOSE OF THE HOLISTIC SCENARIO ANALYSIS 81
5.2 IDENTIFICATION OF DRIVERS AND ACTORS 82
5.2.1 Climate change impacts on rainfall characteristics 83
5.2.2 Population growth 83
5.2.3 Land use change and economic growth 83
5.2.4 Urban actors 84
5.3 ASSESSMENT AND EVALUATION OF SCENARIOS 85
5.3.1 Climate change scenarios 86
5.3.2 Socio-economic scenarios 87
5.3.3 Evaluation of scenarios 88
5.4 SUPPORTING TOOLS FOR HOLISTIC SCENARIO ANALYSIS 88
5.4.1 Climate modelling 88
5.4.2 Modelling land-use change 88
5.4.3 Modelling behaviour of actors 92
5.5 DEVELOPMENT OF A KNOWLEDGEBASE OF MEASURES 92
5.5.1 Pluvial flood protection 97
5.5.1.1 Urban drainage systems 97
General description 97
Implementation aspects relevant for the holistic planning 97
Best practices/examples 98
5.5.1.2 Sustainable drainage systems (SUDS) with the controlled surface conveyance 98
General description 98
Green roofs 101
Pervious pavement 101
Swales 101
Constructed wetlands 102
Detention and retention ponds 102
Rainwater reuse 102
Multipurpose areas for the exceedance flow including surface conveyance systems 102
Best practices/examples 108
Krönsberg – Hanover, Germany (city of Hanover, 2004) 108
5.5.2 Fluvial flood protection 109
General description 109
Implementation aspects relevant for the holistic planning 109
Best practices/examples 111
5.5.3 Groundwater flood protection 111
General description 111
Implementation aspects relevant for the holistic planning 112
Best practices/examples 112
5.5.4 Coastal flood protection 112
General description 112
Implementation aspects relevant for holistic planning 113
Best practices/examples 114
Combining flood protection and landscape planning: Howan coastal protection in Pingtung, Taiwan 114
Combining coastal protection and recreational space: Nanbing in Hualien, Taiwan 115
5.5.5 Flash flood protection 116
Chapter 6: C. Holistic decision-making 143
6.1 THE PURPOSE OF THE HOLISTIC DECISION-MAKING 143
6.2 DEVELOPMENT OF INDICATORS 144
6.3 COMBINING DIFFERENT MEASURES FOR FLOOD RESILIENCE 147
6.4 EVALUATION AND SELECTION OF MEASURES 150
6.5 DEVELOPMENT OF PLANS AND IMPLEMENTATION OF PROJECTS 154
6.5.1 Data and information 155
6.5.2 Some common steps in the production of flood management plans 156
6.5.3 Integrated water resources management plans 156
6.5.4 River basin management plans 157
6.5.5 Catchment flood risk management plans 158
6.5.6 Coastal management plans 158
6.5.7 Disaster management plans 159
6.5.8 Asset management plans 159
6.6 MONITORING AND REVIEW 165
6.7 DECISION SUPPORT TOOLKIT FOR HOLISTIC DECISION-MAKING 166
Chapter 7: Tracing the root causes of floods in the Pasig-Marikina River Basin in Metro Manila, Philippines 173
7.1 INTRODUCTION 173
7.2 IDENTIFYING SOME OF THE DOMINANT ROOT CAUSES 177
7.3 FLOODING ATTRIBUTED TO HUMAN ACTIVITIES AND URBANISATION 177
7.4 FLOOD CONTROL DESIGN LEVEL OF PROTECTION 182
7.5 METRO MANILA FLOOD CONTROL MASTER PLAN 182
7.5.1 Marikina river stormwater tunnel 183
7.5.2 Maximizing flood control function of Laguna de Bay 184
7.6 HOLISTIC FLOOD RISK MANAGEMENT FOR URBAN AREAS 185
7.7 HOLISTIC FLOOD RISK MITIGATION THROUGH SUSTAINABILITY SCIENCE 186
7.8 CONCLUSIONS AND RECOMMENDATIONS 188
Chapter 8: Some notable reflections from the 2011 Thailand floods 191
8.1 INTRODUCTION 191
8.2 TRACING SOME OF THE DOMINANT ROOT CAUSES 192
8.3 ANALYSIS OF IMPACTS 199
8.4 RESPONSES 199
8.5 TOWARDS HOLISTIC RISK ASSESSMENT IN AYUTTHAYA 202
8.5.1 Hazard assessment 203
8.5.2 Vulnerability assessment 204
8.5.3 Risk assessment 207
8.6 CONCLUSIONS 207
Chapter 9: Combination of different types of measures enhances Beijing’s best practices 209
9.1 PROBLEMS AND CHALLENGES 209
9.1.1 General 209
9.1.2 Current stormwater management issues 210
9.1.3 Urban waterlogging 210
9.1.4 Stormwater runoff pollution 210
9.1.5 Conflicts between water shortage and stormwater loss 211
9.1.6 Challenges facing Beijing 211
9.2 CURRENT STORMWATER MANAGEMENT 212
9.2.1 Evolution of stormwater management 212
9.2.2 Engineering measures 213
9.2.2.1 Stormwater discharge system 213
9.2.3 Urban flood control system 214
9.2.4 Urban waterlogging control facility 214
9.2.5 Urban stormwater utilization facility 215
9.2.6 Low Impact Development (LID) practice 215
9.3 NON-STRUCTURAL MEASURES FOR STORMWATER MANAGEMENT 218
9.3.1 Institutional arrangements 218
9.3.2 Emergency response 218
9.3.3 Stormwater management policies and laws/regulations 219
9.4 LESSONS LEARNED 220
9.4.1 Valuable experiences 220
9.4.1.1 Attentions to new concepts and technologies 220
9.4.1.2 Application of stormwater utilization technologies 220
9.4.2 Lessons 221
9.4.2.1 Need for improved design standard 221
9.4.2.2 Investigation of existing stormwater system 221
9.4.2.3 Establishment of monitoring system 221
9.4.2.4 Establishment of particular waterlogging control facility 221
9.4.2.5 Intelligent stormwater management 221
9.4.2.6 Establishment of waterlogging risk assessment system 221
9.4.2.7 Establishment of complete regulation and policy system 222
Chapter 10: Holistic risk governance – where do we stand? 223
10.1 SYNTHESIS 223
10.2 PLACING ABCS OF HOLISTIC PLANNING INTO PRACTICE 227
10.3 CONCLUDING REMARKS 227
10.3.1 Holistic governance and active stakeholder participation 227
10.3.2 Methods, tools and planning of resources 227
10.3.3 Possible funding schemes 233
Afterword 235
References 237
Appendix 249
Glossary 257
Index 267