Development of a low-cost methodology for data acquisition and flood risk assessment in the floodplain of the river Moustiques in Haiti

Over the past two decades, Haiti was struck by 30 storm events and 40 floods, affecting over 3.5 million people. Being the poorest country in the Northern hemisphere, it is unable to allocate funds to risk assessment and management. Therefore, this research developed a low-cost methodology to analyse flood risk in data-sparse regions. The floodplain of the river Moustiques was chosen as study area. First, a methodology was developed and input data were gathered from existing data, literature, field data, and open source data. Then, a flood risk assessment was performed for the area. The resulting economic risk map and social risk map indicate that the region is at risk for nearly 2 million USD and has potentially 60 casualties per year. Although the assessment was performed as a quantitative analysis, the resulting maps should be interpreted qualitatively, as the values could not be validated. Nonetheless, the results clearly indicate the high-risk areas where measures should be taken. Furthermore, this research shows the potential of citizen science, in the form of a questionnaire survey conducted in the floodplain. This low-cost and fast acquisition method provided many different input data for flood risk assessment, from population data to damage factors and validation information on historic flooding

Flood risk mapping worldwide : a flexible methodology and toolbox

Flood risk assessments predict the potential consequences of flooding, leading to more effective risk management and strengthening resilience. However, adequate assessments rely on large quantities of high-quality input data. Developing regions lack reliable data or funds to acquire them. Therefore, this research has developed a flexible, low-cost methodology for mapping flood hazard, vulnerability and risk. A generic methodology was developed and customized for freely available data with global coverage, enabling risk assessment worldwide. The default workflow can be enriched with region-specific information when available. The practical application is assured by a modular toolbox developed on GDAL and PCRASTER. This toolbox was tested for the catchment of the river Moustiques, Haiti, for which several flood hazard maps were developed. Then, the toolbox was used to create social, economic and physical vulnerability maps. These were combined with the hazard maps to create the three corresponding flood risk maps. After creating these with the default data, more detailed information, gathered during field work, was added to verify the results of the basic workflow. These first tests of the developed toolbox show promising results. The toolbox allows policy makers in developing countries to perform reliable flood risk assessments and generate the necessary maps

Renewing Local Planning to Face Climate Change in the Tropics

climate vulnerability; urban resilience; climate change; adaptation; planning; environmental risk analysis; decision making; disaster risk reduction; tropical climate managemen

Renewing Local Planning to Face Climate Change in the Tropics

This book aims to inspire decision makers and practitioners to change their approach to climate planning in the tropics through the application of modern technologies for characterizing local climate and tracking vulnerability and risk, and using decision-making tools. Drawing on 16 case studies conducted mainly in the Caribbean, Central America, Western and Eastern Africa, and South East Asia it is shown how successful integration of traditional and modern knowledge can enhance disaster risk reduction and adaptation to climate change in the tropics. The case studies encompass both rural and urban settings and cover different scales: rural communities, cities, and regions. In addition, the book looks to the future of planning by addressing topics of major importance, including residual risk integration in local development plans, damage insurance and the potential role of climate vulnerability reduction credits. In many regions of the tropics, climate planning is growing but has still very low quality. This book identifies the weaknesses and proposes effective solutions

Minimising flood risk accumulation through effective private and public sector engagement

Flooding is a global problem affecting both developing and developed countries. Academics and practitioners in climate science frequently argue that changing climatic conditions are likely to worsen the length and severity of these flood events, which will have catastrophic consequences to economies and social lives of communities world over. Whilst the overall consequences affecting many regions have been established, effective and efficient strategies to cope with the effects of flooding and building up resilience strategies have not properly evolved. This paper examines this issue by exploring effective strategies undertaken in partnerships between private and public stakeholders. The paper details two case studies conducted in a developed and a developing country to investigate what global strategies for coping and resilience to flooding have worked in practice. The two case studies: Cockermouth in Cumbria, UK and Patuakhali in Bangladesh provide interesting insights on how some of the strategies work within the chosen developed and developing country contexts. The case study findings are mapped against UNISDR’s ten-point checklist under the “Making Cities Resilient Campaign”. In conclusion the paper examines how these findings can be incorporated within city development plans to develop stakeholder capacity and capability and eventually build up resilient cities

Minimising flood risk accumulation through effective private and public sector engagement

Flooding is a global problem affecting both developing and developed countries. Academics and practitioners in climate science frequently argue that changing climatic conditions are likely to worsen the length and severity of these flood events, which will have catastrophic consequences to economies and social lives of communities world over. Whilst the overall consequences affecting many regions have been established, effective and efficient strategies to cope with the effects of flooding and building up resilience strategies have not properly evolved. This paper examines this issue by exploring effective strategies undertaken in partnerships between private and public stakeholders. The paper details two case studies conducted in a developed and a developing country to investigate what global strategies for coping and resilience to flooding have worked in practice. The two case studies: Cockermouth in Cumbria, UK and Patuakhali in Bangladesh provide interesting insights on how some of the strategies work within the chosen developed and developing country contexts. The case study findings are mapped against UNISDR’s ten-point checklist under the “Making Cities Resilient Campaign”. In conclusion the paper examines how these findings can be incorporated within city development plans to develop stakeholder capacity and capability and eventually build up resilient cities

Investigation of superstorm Sandy 2012 in a multi-disciplinary approach

At the end of October 2012, Hurricane Sandy moved from the Caribbean Sea into the Atlantic Ocean and entered the United States not far from New York. Along its track, Sandy caused more than 200 fatalities and severe losses in Jamaica, The Bahamas, Haiti, Cuba, and the US. This paper demonstrates the capability and potential for near-real-time analysis of catastrophes. It is shown that the impact of Sandy was driven by the superposition of different extremes (high wind speeds, storm surge, heavy precipitation) and by cascading effects. In particular the interaction between Sandy and an extra-tropical weather system created a huge storm that affected large areas in the US. It is examined how Sandy compares to historic hurricane events, both from a hydro-meteorological and impact perspective. The distribution of losses to different sectors of the economy is calculated with simple input-output models as well as government estimates. Direct economic losses are estimated about USD 4.2 billion in the Caribbean and between USD 78 and 97 billion in the US. Indirect economic losses from power outages is estimated in the order of USD 16.3 billion. Modelling sector-specific dependencies quantifies total business interruption losses between USD 10.8 and 15.5 billion. Thus, seven years after the record impact of Hurricane Katrina in 2005, Hurricane Sandy is the second costliest hurricane in the history of the United States

Examining North Carolina’s recent tropical cyclone history: twenty years on the Neuse River

Tropical cyclones (TCs) pose a persistent threat to North Carolina. The state’s coastal plain and outer banks lie between 78 and 75 degrees W, farther east than any other southeastern state. In the last 150 years there have been more than 400 tropical and subtropical cyclones that have affected the state. This project seeks to examine what has become a recurring problem. The storms come, they flood, and the most vulnerable members of society lose everything. Major research questions include: 1) How do the geographic extent of the individual floods compare to the 100-year floodplain and its margins? 2) How many buildings fell within the flooded area? 3) How do the individual floods compare to one another, and what factors explain their differences? The methodology for this study used NASA Landsat 5 and NOAA aerial imagery to examine the extent of the flooded area. Supervised and unsupervised land cover classifications were created to compare the floods on a pixel-by-pixel level. Key results from this study included the number of total buildings in the study area that had been flooded in any one or all of the TCs, the observation that TC Matthew was by far the most disastrous of the three TCs studied, and that both TCs Matthew and Florence met or exceeded the defined 100-year floodplain in the area of study. Although this study is limited in scope, it may provide a stepping stone to further examination of how best to deal with the new reality of 100-year floods every decade in a socially vulnerable urban landscape