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Floods are consistently ranked as the most financially devastating natural disasters worldwide. Recent flood events in the Netherlands, Caribbean, and US have drawn attention to flood risks resulting from pluvial and fluvial sources. Despite shared experiences with flooding, these regions employ distinct approaches and flood management strategies due to differences in governance and scale—offering a three-site case study comparison. A key, yet often lacking, factor for flood risk and damage assessments at the parcel level is building elevation compared to flood elevation. First-floor elevations (FFEs) are a critical element in the vulnerability of a building flooding. US-based flood insurance policies require FFEs; however, data availability limitations exist. Drone-based FFEs were measured in all locations to assess the flood vulnerabilities of structures. Flood vulnerability profiles revealed 64% of buildings were vulnerable to a form of inundation, with 40% belonging to "moderate" or "major" inundation, and inundation elevation means (IEMs) of −0.55 m, 0.19 m, and 0.71 m within the US, Netherlands, and Puerto Rico sites, respectively. Spatial statistics revealed FFEs were more responsible for flood vulnerabilities in the US site while topography was more responsible in the Netherlands and Puerto Rico sites. Additional findings in the Puerto Rico site reveal FFEs and next highest floor elevations (NHFEs) vulnerable to future sea level rise (SLR) flood elevations. The findings within the Netherlands provide support for developing novel multi-layered flood risk reduction strategies that include building elevation. We discuss future work recommendations and how the different sites could benefit significantly from strengthening FFE requirements. [ABSTRACT FROM AUTHOR]

Climatic changes can cause unpredictability in flood regimes that traditional flood risk management (FRM) approaches may struggle with. Therefore, flood resilience is seen as a supplementation to these approaches, putting a larger emphasis on flood acceptance and minimising consequences. An (emergent) group contributing towards flood resilience is civil society. This paper examines how civil society contributions can be furthered and guided in the Netherlands as well as exploring potential limitations in doing so. To achieve this, England is used as a good practice example due to a more developed and defined role for civil society being present here. Data were collected on both actual (England and the Netherlands) and potential (The Netherlands) civil society contributions. These were compared to identify potential avenues for Dutch civil society contributions to flood resilience that can be further investigated. The research shows that the most promising avenues are improving advocacy from citizens, improving local flood awareness and developing relationships between FRM authorities and existing citizen groups that can be harnessed and mobilised to support flood resilience. Additionally, the research also provides insights into potential limitations for transferring resilience approaches from one context to another beyond the cases discussed in this publication. [ABSTRACT FROM AUTHOR]

Flood risk quantification is a complex process involving a chain of models. The approach contains many uncertainties which accumulate in the calculated flood risk. Risk-based flood safety standards are therefore prone to large uncertainty. This study aims to quantify the uncertainty of risk-based flood safety standards for a Dutch riverine case study. Through a systematic approach using expert elicitation, the key uncertainty sources in the Dutch safety standard derivation are identified. Uncertainty magnitudes are quantified for five main sources of uncertainty, after which these uncertainties are propagated through the model chain in a scenario analysis to derive flood safety standards. The results show that the Dutch risk-based flood safety standards are highly uncertain given the relative uncertainty bandwidth of 70%. The flood safety standards are found to be most sensitive to damage function and evacuation uncertainty. Also, we show that the impact of uncertainty strongly depends on local characteristics. [ABSTRACT FROM AUTHOR]

Flood defences are in practice often multi‐used, multi‐managed and multi‐financed. Flood defence asset management contains technical, organizational and spatial complex issues involving multiple organizations. In the literature, little attention has been given to the conditions for successful cooperation between organizations in flood defence asset management. This paper elaborates on this aspect of mature asset management from a practical point of view. Although the importance of a fit‐for‐purpose cooperation seems trivial, practice shows that the shape of cooperation is often the coincidental result of implicit or ad‐hoc choices and is not deliberately designed. This paper reports on empirical data gathered in a case consisting of five different situations related to collaboration in flood defence management. The management context consists of three main tasks: performance assessment, reinforcement and daily management, and three decision levels: strategic, tactical and operational, resulting in nine different management environments and related interfaces. For effectively achieving desired outcomes, the shape of cooperation has to be explicitly chosen dependent on the complexity of content and organizational context, and relevant external circumstances: situational cooperation. [ABSTRACT FROM AUTHOR]

Dikes are an effective flood risk reduction measure in deltaic areas. Present risk analyses consist often of decoupled calculations of probabilities of dike failure and calculation of consequences of flooding given dike failure. However, the flood defense design determines not only the probability of failure, but influences the consequences of flooding as well. Especially when the dike has a ductile failure and breach growth behavior, due to a structural robust design, the consequences of flooding reduce. In this article, we present a novel assessment of risks and investments, valuing structural robustness of a construction type, represented by its ductile behavior during high loads. Therefore, the consecutive occurrence of initial dike failure mechanisms, failure path development, breach growth, and consequences is modeled integral and time‐dependent. The investments consist of the costs to reinforce or reconstruct the flood defense to behave relatively ductile. This integral assessment enables to compare flood impacts of different construction types and different dimensions of designs. We applied it on a case in a riverine area in the Netherlands. The results show that the total societal costs and the individual risks on victims are very dependent on the construction type. The risk profile of a polder protected by a brittle or a ductile dike differs significantly. The brittle sand dike in the case requires larger dimensions than the more ductile dike with a clay core. [ABSTRACT FROM AUTHOR]

This paper describes the development and trial of a method (Quick Flood Risk Scan method) to determine the vulnerable value of monuments for flood risk assessment. It was developed in the context of the European Flood Directive for the Dutch Flood Risk Management Plan. The assessment method enables differentiation of cultural heritage by cultural value and vulnerability to water from rainfall or flooding. With this method, hazard or exposure maps can be turned into risk maps showing the potential loss of cultural value in case of flooding with a particular probability. The Quick Flood Risk Scan method has been tested and validated in the City of Dordrecht, the Netherlands. This application was facilitated by an Open Lab of the SHELTER project. The trial in Dordrecht showed the potential of a simple method to prioritize monuments without calculations. The Quick Flood Risk Scan method enables even the non-expert assessor to make a preliminary qualitative assessment that can be followed by further analysis of a relevant selection of assets. It is useful as a low tier that feeds into higher tiers of a multi-level framework. The non-expert assessor may be a policy maker, an owner of a heritage asset, or an inhabitant. Nonetheless, the trial also raised several questions, ranging from where in a building valuable heritage is located and what the role of the building owner is to how policy makers implement the method and its outcomes. These questions provide relevant input for fine-tuning the method. [ABSTRACT FROM AUTHOR]

Flood events are expected to increase in their frequency and severity, which results in higher flood risk without additional adaptation measures. The information gained from flood risk models is essential in effective disaster risk management. However, vulnerability estimations are often a large driver of uncertainty, and flood damage is rarely estimated due to a lack of empirical damage data from flood events. This study uses a unique data set with experienced damages and the implementation of flood damage mitigation (FDM) measures on the household level, collected after the flood event in the Netherlands in 2021. Flood damage models that control for several hazard, exposure, and vulnerability indicators are estimated and allow for additional input in flood risk models. Previous estimates of the effectiveness of FDM measures are prone to a selection bias, as households that do, and do not implement FDM measures systematically differ in their risk profiles. By using an instrumental variable‐estimation, this study overcomes this selection bias and finds significant reductions in flood damage due to FDM measures. These reductions can be incorporated in multivariate flood vulnerability estimations, which indicate that FDM measures significantly reduce flood damage. Providing information on flood hazard, as well as implementing early warning systems, is crucial for ensuring effective flood risk management. Plain Language Summary: Due to climate change, we can expect more frequent and severe floods in the future. This study investigates how households are affected by flooding and explores ways to reduce potential flood damage. By understanding the impact of floods on households and identifying effective measures, we can better manage flood risks and reduce damages caused by these events. We collected survey data after the 2021 Summer Floods in the Netherlands to understand the factors that contribute to flood damage. Timely warnings before flooding play a crucial role in preparing for such events. They allow households to take emergency actions like placing sandbags or moving belongings to higher floors. These actions can reduce flood damage to buildings by almost 30% of their total value and protect nearly 40% of the value of household contents. In addition to emergency measures, households can take proactive steps to prepare for future floods. This includes using waterproof materials and elevating electrical appliances, such as power sockets or kitchen appliances when constructing new homes or making renovations. Key Points: Detailed survey data allows for the update and calibration of rarely estimated empirical vulnerability curves for buildingsFlood damage mitigation (FDM) measures have the potential to reduce flood damage to both residential buildings and household contents by halfUpdated input for flood risk models in the form of multivariate damage functions that can be adjusted for FDM measures [ABSTRACT FROM AUTHOR]

A bifurcation in an engineered river system (i.e., fixed planform and width) has fewer degrees of freedom in its response to interventions and natural changes than a natural bifurcation system. Our objective is to provide insight into how a bifurcation in an engineered river responds to peak flows and human interventions. To this end, we analyze the change in hydraulics, bed level, and bed surface grain size in the region of two bifurcations in the upper Rhine delta in the Netherlands over the last century. We show that, over the last two decades, the water discharge in one bifurcate (the Waal branch) has steadily increased at the expense of the other. This gradual increase in the water discharge of the first branch is associated with its erosion rate being larger than the other branch. The quick succession of two or three peak flow events (1993, 1995, and 1998) caused rapid sediment deposition over the upstream part of the bifurcate that has gradually lost discharge, which seems to have triggered the slow change in flow partitioning. Plain Language Summary: A river bifurcation is where a river splits into two branches. Water and sediment from the upstream channel are divided between the bifurcation's downstream branches. This division is important for flood risk, freshwater supply, and navigation. Here we investigate the flow division and related changes in bed level and bed surface grain size in the bifurcation region in the upper Rhine delta in the Netherlands over the last century. We find that, over the last two decades, one branch (the Waal branch) has gradually received a larger share of the water discharge at the expense of the other branch. This gradual increase in the water discharge of the first branch seems to be associated with its erosion rate being larger than the other branch. This slow change in the division appears to be triggered by two or three successive peak flows (1993, 1995, and 1998), which caused sediment to deposit at the upstream end of the branch that subsequently started losing discharge gradually. Our analysis shows that peak flows can play a large role in bifurcation development in engineered river systems. Key Points: Water discharge in one branch at a Dutch Rhine bifurcation has slowly increased at the expense of the other bifurcateThis slow change in flow partitioning is associated with one bifurcate eroding faster than the other bifurcateSudden deposition in one bifurcate (due to rapid succession of peak flows and sediment flux coarsening) likely triggered these changes [ABSTRACT FROM AUTHOR]

The multi-layer safety approach was introduced in 2009 in the Netherlands as a result of the shift from flood prevention to flood risk management. It aims at reducing flood risks by integrating defensive measures against floods (layer 1), resilient spatial planning measures (layer 2), and effective disaster management measures (layer 3). But how are these measures integrated? This contribution explores that question with a qualitative case study in Zwolle. In particular, policy and territorial integration among the multiple stakeholders are analysed. The analysis shows that the defensive approach (layer 1) still prevails, but that flood risk management is integrated into spatial planning (layer 2) in terms of policy integration and territorial integration. That is not the case for disaster management (layer 3), which remains detached from the other two layers. This contributes to the debate on integration in water management with other sectors through an in-depth analysis. [ABSTRACT FROM AUTHOR]

Copyright of Fire Ecology is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Germany, Belgium and the Netherlands were hit by extreme precipitation and flooding in July 2021. This brief communication provides an overview of the impacts to large-scale critical infrastructure systems and how recovery has progressed. The results show that Germany and Belgium were particularly affected, with many infrastructure assets severely damaged or completely destroyed. Impacts range from completely destroyed bridges and sewage systems, to severely damaged schools and hospitals. We find that (large-scale) risk assessments, often focused on larger (river) flood events, do not find these local, but severe, impacts due to critical infrastructure failures. This may be the result of limited availability of validation material. As such, this brief communication not only will help to better understand how critical infrastructure can be affected by flooding, but also can be used as validation material for future flood risk assessments. [ABSTRACT FROM AUTHOR]

Sea level rise (SLR) will affect water levels and increase flood risk in river deltas. To adapt river deltas to SLR, various strategies can be followed. Many urbanised river deltas already have flood protection in place. Continuing a protection strategy under an increasing SLR, would mean higher embankments along the coast and rivers and possibly closing off the river mouths from the sea. However, closing of rivers will hamper the river flow. How to adapt river deltas and enabling rivers to discharge into the sea is a challenging question. This paper assesses impacts of SLR on flood risks in the Rhine‐Meuse Delta in the Netherlands in case the current protection strategy is continued and explores two alternative protection strategies: (1) a closed system with pumps and discharge sluices and (2) an open system in which rivers are diverted to less densely populated areas. The second alternative results in a more flexible river delta, which can accommodate larger SLR. The paper shows that a systems approach and using quantitative assessments of the implications of strategies is possible. This is needed to further assess the adaptation options, so we can anticipate and adapt when needed and avoid regret of decisions. [ABSTRACT FROM AUTHOR]

Sustainable flood risk management (SFRM) has become popular since the 1980s. Many governmental and non-governmental organisations have been keen on implementing the SFRM strategies by integrating social, ecological, and economic themes into their flood risk management (FRM) practices. However, the justifications for SFRM are still somewhat embryonic, and it is not yet clear whether this concept is influencing current policies in different countries. This paper reviews the past and current flood management experiences from flood defence to SFRM in four developed countries to highlight lessons for coastal megacities in development. The paper explores recent strategies such as "Making Space for Water", Planning Policy Statement 25 (PPS25), and the National Planning Policy Framework (NPPF) in the UK and "Room for the River" in the Netherlands, which were implemented to mitigate flooding, integrate FRM with sustainability concepts, and deliver sound FRM practice for future generations. In this context, the United States has also established a National Flood Insurance Program (NFIP), and in a different approach, Japan has developed an advanced flood warning and evacuation contingency system to prepare for climatic extremes. These case studies give good lessons in achieving long-term SFRM to deliver sound flood management practices considering socio-economic and environmental concerns. Most developing coastal megacities especially in Asia are still heavily reliant on a traditional hard-engineering approach, which may not be enough to mitigate substantial risks due to human factors (e.g. large population, rapid socio-economic growth, subsidence from excessive groundwater extraction) and natural factors (e.g. climate change including sea-level rise and land subsidence). It is clear that different countries and cities have their interpretation of SFRM, but this paper explores how policymakers can adopt "mixed options" to move towards long-term thinking about sustainability with social, economic, and environmental considerations. [ABSTRACT FROM AUTHOR]

The Netherlands is internationally renowned for its flood risk management, but three consecutive dry years between 2018–2020 fuelled the debate on how to deal with future drought risk. Drought governance in the Netherlands is still in its infancy. The increased sense of urgency has led many scholars and policy makers to call for transitions towards a more anticipatory drought governance which enables transformative actions in an adequate and timely manner. Whilst transitions have been studied before, few have looked at governance systems, and even fewer on the processes that can steer the direction and speed of governance transitions in the future. This paper adopts a novel perspective by combining theories on mechanisms and transitions to analyse future governance transitions. The aim of this study is to identify the key mechanisms that have potential to steer and/or accelerate transitions in Dutch drought governance. This study focusses on the upper part of the Dutch Meuse River basin. Using a document analysis, expert interviews, and focus group discussions, the findings show that five underlying micro-level mechanisms are critical to steer and accelerate transitions. These include social learning, shared problem perception, administrative courage and leadership, persistency, and institutionalisation. The novel transition-mechanistic conceptual approach adopted in this study offers a starting point for other studies that wish to obtain a better understanding of underlying processes in a transition. [ABSTRACT FROM AUTHOR]

The study of flood management has experienced a paradigmatic shift over the past two decades. Particularly notable are the embracement of flood risk management (FRM) and comparative analysis of flood risk governance (FRG), meaning the complex institutional arrangements that shape the behavior of state and societal actors concerning FRM. Thousands of publications have addressed these themes, and this field of study is ripe for a systematic analysis that consolidates and structures this rapidly evolving literature. This study employed a bibliometric methodology to analyze the metadata (including authorship, keywords, abstracts, and citations) of 3059 such publications. The results reveal that both FRM and FRG scholarship have expanded over the past two decades; the United Kingdom and the Netherlands are the most prominent countries of origin, a small number of prolific authors stands out as major contributors, and a relatively small number of journals dominate as publication venues. The text mining results reveal that the bodies of FRM and FRG scholarship are highly correlated but yet differ in core subject matter, as demonstrated by the unique keywords found in the analysis. The findings are useful for researchers seeking relevant clusters for study and therefore offers reference value for future research and practice. [ABSTRACT FROM AUTHOR]

Environmental disasters, and especially floods, are among today's biggest sustainability challenges. The number and intensity of floods are increasing, challenging current governance approaches. Governments worldwide are looking to diversify their flood risk management and adaptation strategies, among others, by increasing resident involvement in flood risk governance. Such involvement of individuals shifts responsibilities from public to private actors. A clear understanding of the extent and implications of this shift is difficult to reach as theoretical perspectives on the concept of responsibility vary. Similarly, grounds for attributing responsibility for flood preparedness and response differ across countries. This lack of analytical and empirical clarity complicates academic and policy discourses on what it actually means to 'be responsible'. The current article systematises these different approaches to responsibility in flood risk governance. To improve current knowledge on residents' responsibilities in flood risk governance, we present a conceptual framework that distinguishes among four theoretical notions of responsibility: legal responsibility, accountability, perceived responsibility, and moral responsibility. These notions are elucidated with the help of examples of flood risk governance practices in the United States, Germany and the Netherlands. We find that the four notions are closely intertwined. In addition, this article documents divergences between what individuals perceive as their own responsibility in flood risk management and the responsibilities that governments assume. We conclude with a discussion on the tensions between perceived responsibilities and the other three notions. Explicit, transparent and open discussion on these tensions is needed to allow attribution of responsibility in flood risk governance and to reconsider residents' roles in particular. [ABSTRACT FROM AUTHOR]

Recent observations and publications have presented the possibility of a high and accelerated sea-level rise (SLR) later this century due to ice sheet instability and retreat in Antarctica. Under a high warming scenario, this may result in a sea level in 2100 that is up to 2 m higher than present and 5 m in 2150. The large uncertainties in these projections significantly increase the challenge for investment planning in coastal strategies in densely populated coastal zones such as the Netherlands. In this paper, we present the results of two studies that were carried out within the framework of the Dutch Delta Programme. The first study showed that it is not only the absolute SLR that presents a challenge but also the annual rate of rise. The latter impacts the lifetime of constructions such as barriers and pumping stations. When the rate of sea-level rise increases up to several centimeters per year, the intended lifetime of a flood defense structure may be reduced from a century to several decades. This new challenge requires new technologies, experiments, strategies, and governance. The second study explored different strategies for the long term to adapt to high SLR (>1 m) and assessed the consequences thereof on adaptation and developments in the coming 2–3 decades. We believe that strategic choices have to be made regarding the permanent closure of estuaries, the pumping or periodic storage of high river discharges, agriculture in an increasingly saline coastal area, and the maintenance of the coastline by beach nourishments. These strategic choices have to be complemented by no-regret measures such as spatial reservations for future sand extraction (for beach nourishments) and future expansion of flood defenses, water discharge, and water storage. In addition, it is advised to include flexibility in the design of new infrastructure. [ABSTRACT FROM AUTHOR]

Around the world, deltaic and coastal regions like the Netherlands are facing challenges from climate, change such as sea-level rise as well as more frequent and extreme natural events. Since 2009, the Dutch government has tried to mitigate flood vulnerability by deploying a balanced mix of flood protection measures, resilient spatial planning and crisis management (Multi-Layer Safety). However, recent evaluations have concluded that resilient spatial planning is (too) limitedly applied in practice. This article aims to understand the barriers and opportunities for resilient spatial planning in flood risk management by comparing two cases where resilient spatial planning was opted for: Dordrecht and the IJssel-Vecht Delta. The study suggests a large gap between the wide array of possible measures, and those that are actually realized in practice. Three physical-spatial barriers were identified: maximum flood depths, lack of space, and rigidity of the existing built environment. Additionally, institutional-organizational barriers were found, including: a false, low or non-existent safety perception or risk awareness, and therefore a lack of urgency to act; a lack of political and societal support; a suboptimal collaboration between stakeholders; ambiguity regarding responsibilities; finances and a cost-benefit imbalance; and a lack of human capital. Subsequently, the article explores possibilities to overcome these barriers. Overcoming these barriers can pave pathways for flood resilient spatial planning. The institutional-organizational barriers appear surmountable, whereas the physical-spatial barriers prove to be more problematic and form the most important restrictive factor for resilient spatial planning in flood risk management. [ABSTRACT FROM AUTHOR]

Climate adaptation and water management, in particular flood risk management (FRM), in the Netherlands are strongly integrated policy domains. The observed and expected effects of climate change in the Netherlands will create a variety of pressures, particularly in relation to sea-level rise, increasing river discharges and changing precipitation patterns. Whereas the focus in the Netherlands until recently was mainly and successfully on minimizing the probability of flooding ('the fight against water') and preparedness in case of a flood threat, in the course of time other strategies aimed at mitigating the effects of potential floods have gained a more prominent position ('living with water'). As a result, FRM measures increasingly demand more space and more diverse actors became involved in Dutch FRM. This has increased complexity and fragmentation in the responsibilities for Dutch FRM, which resulted in an increasing need for communication, coordination and collaboration between different public and private actors in order to secure the effectiveness of FRM. [ABSTRACT FROM AUTHOR]

Backward erosion piping poses a severe threat for embankments founded on sandy deposits. The physical mechanism by which a pipe progresses upstream beneath the embankment is conceptually understood, and assessments indicate high failure probabilities in the Netherlands. Rising sea levels and economic growth increase the risk of flooding, and the need for remediation measures. Conventional measures have undesired side effects, in terms of costs, maintenance, space requirements and sustainability. The coarse sand barrier (CSB) is a novel nature-based solution lacking these side effects. The CSB is a trench filled with coarse sand that is placed below the downstream toe of the embankment, which prevents the pipe from progressing upstream. The effectiveness of the CSB is based on its higher resistance against erosion and its effect on groundwater flow. This paper presents experimental work that was conducted to test the feasibility of a CSB for application at a pilot site in the Netherlands. This involved experiments with seepage lengths of 0·34, 1·34 and 15 m, using different barrier materials and background sands. A conceptual model is presented for the physical mechanism of pipe formation in the presence of a barrier. As the resistance of the barrier can be characterised by a local scale-independent strength criterion, laboratory results are applicable for design practice. [ABSTRACT FROM AUTHOR]

Germany, Belgium and The Netherlands were hit by extreme precipitation and flooding in July 2021. This Brief Communication provides an overview of the impacts to large-scale critical infrastructure systems and how recovery has progressed during the first six months after the event. The results show that Germany and Belgium were particularly affected, with many infrastructure assets severely damaged or completely destroyed. Impacts range from completely destroyed bridges and sewage systems, to severely damaged schools and hospitals. We find that large-scale risk assessments, often focused on larger (river) flood events, do not find these local, but severe, impacts. This may be the result of limited availability of validation material. As such, this study will not only help to better understand how critical infrastructure can be affected by flooding, but can also be used as validation material for future flood risk assessments. [ABSTRACT FROM AUTHOR]

Sustainable flood risk management (SFRM) has become popular since the 1980s. Many governmental and non-governmental organisations have been keen on implementing the SFRM strategies by integrating social, ecological and economic themes into their flood risk management (FRM) practices. However, justifications for SFRM are still embryonic and it is not yet clear whether this concept is influencing the current policies in different countries. This paper reviews the past and present flood management approaches and experiences from flood defence to FRM in four developed countries with the aim of highlighting lessons for developing mega deltas. The paper explored recent strategies such as "Making Space for Water, PPS 25, and NPPF" in the UK; "Room for Rivers" in the Netherlands which was promoted to cope with flooding, integrate FRM with ideas on sustainability, and deliver good FRM practice for next generations. The United States has also established a sound National Flood Insurance Program (NFIP), and Japan has developed an advanced flood warning and evacuation contingency system to prepare for climatic extremes. These case studies showed some good lessons to achieve long term SFRM direction to deliver flood management practices with social-economic and environmental concerns. Most of developing coastal megacities especially in Asia are still heavily reliant on traditional hard-engineering approach, that may not be enough to mitigate substantial risks due to human (exist huge populations, rapid socio-economic growth, subsidence) and natural (climate change) factors. We understand different countries and cities have their own interpretation on SFRM, but recommend policy makers to adopt "mixed options" towards thinking about long term and sustainability that with social, economic and environmental considerations. [ABSTRACT FROM AUTHOR]

Flood simulations are important for flood (fatality) risk assessment. This article provides insight into the sensitivity of flood fatality risks to the model resolution of flood simulations and to several uncertain parameters in the loss of life model used. A case study is conducted for river flooding in a polder in the Netherlands (the Bommelerwaard) where the Dutch approach for loss of life estimation is applied. Flood models with resolutions of 100, 25, and 5 m are considered. Results show locally increased mortality rates in higher resolution simulations nearby structures including road embankments, dikes, and culverts. This causes a larger maximum individual risk value (annual probability of death for a person due to flooding) which has consequences for safety standards based on the individual risk criterion. Mortality rate in the breach zone is also affected by representations of buildings as solid objects versus as roughness elements. Furthermore, changes in the loss of life estimation approach via alternative ways of including people's behaviour, building characteristics, and age of the population, have a significant impact on flood fatality risk. Results from this study can be used to support future risk assessments and decision making with respect to safety standards. [ABSTRACT FROM AUTHOR]

Copyright of Electronic Turkish Studies is the property of Electronic Turkish Studies and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This article synthesizes the literature on Dutch flood risk governance to analyze how external conditions shaped past and present dynamics of cross-sector collaboration for integrated flood risk management in the Netherlands. It traces the extent to which policy and legal frameworks, socio-economic circumstances, political realities, power relations and conflict situations have influenced attempts at collaboration between flood safety, spatial planning, environmental protection and other sectors. Despite the growing interdependences, existing power relations between the sectors are characterized by the dominance of the water sector. Hence, cross-sector collaboration can develop as long as it does not compromise flood safety. [ABSTRACT FROM AUTHOR]

Copyright of ZARCH: Journal of Interdisciplinary Studies in Architecture & Urbanism is the property of Universidad de Zaragoza and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

• We compared multilevel coastal flood risk reduction governance and public finance in the UK, Germany, the Netherlands and Australia. • We evaluated alignment of multilevel governance arrangements to spillovers from coastal risk reduction based on fiscal federalism. • We find diverse coastal flood risk governance arrangements ranging from highly centralised to full decentralisation. • We find that multilevel coastal flood risk governance arrangements are reflective of the distribution of the benefits across different levels of government. • We find that major fiscal redistributions may be put under pressure by rising costs under SLR and coastal development. Coastal flood risk reduction (CFRR) presents a significant public funding challenge, due to its high upfront costs and long-term benefits, and this challenge will increase with future sea-level rise. The funding challenge necessarily involves multiple levels of government, due to the regional nature of CFRR public goods involved. Yet there has been little research comparing such multilevel arrangements across countries, and in particular exploring the performance of public funding arrangements for providing coastal flood risk reduction. We address this gap, applying fiscal federalism to develop a multilevel governance analysis of public decision-making and fiscal authorities for CFRR in the Netherlands, Germany, the UK and Australia. For each country, we locate key decision-making and fiscal authorities in multilevel governance arrangements, and analyse their alignment with the benefits of CFRR measures (spillovers). We find diverse coastal flood risk governance arrangements ranging from highly centralised (NL), mixed arrangements, involving regional centralisation (Germany) or partial devolvement (UK), to full decentralisation (AUS). Further, we find that in accordance with fiscal federalism, multilevel coastal flood risk governance arrangements are generally reflective of the distribution of the benefits across different levels of government, with some exceptions (Germany and UK). Finally, exploring the outlook of current arrangements under sea-level rise, we find that major fiscal redistributions may be put under pressure by rising costs likely under SLR and future coastal development. This is particularly the case for those systems which operate under hazard-based, as opposed to risk-based, coastal protection policies. Further, we find that both fully and moderately decentralised arrangements may require greater central support for alternative measures, such as retreat, in light of growing financial burdens on local governments. [ABSTRACT FROM AUTHOR]

Investment decisions about capital-intensive, long-lived infrastructure are challenging due to uncertainty about their future performance, particularly if the performance is sensitive to climate change. Such investments, like those made for water infrastructure, are rarely evaluated over their total operational lifetime, during which socio-economic and environmental changes can cause potential lock-ins and reduced options for future choices that lead to high costs to transfer to other options. We propose an economic evaluation framework to explore adaptation pathways, or sequences of strategic investments options, that can be implemented if needed due to changing conditions. A novel feature is the inclusion of "transfer costs" associated with a switch to alternative pathways to allow adaptive decision-making and to minimize the cost of adjustment over time. Implementing a pathway-driven approach represents a break with most institutional decision-making processes and can significantly improve decision-making under uncertainty compared to the conventional single-investment perspective. We present a case study on flood risk management in the Netherlands to show the long-term socio-economic consequences of short-term decisions by going beyond the project cycle horizon. [ABSTRACT FROM AUTHOR]

Flooding is one of the most significant natural disasters worldwide. Nevertheless, voluntary take‐up of individual damage reduction measures is low. A potential explanation is that flood risk perceptions of individual homeowners are below objective estimates of flood risk, which may imply that they underestimate the flood risk and the damage that can be avoided by damage reduction measures. The aim of this article is to assess possible flood risk misperceptions of floodplain residents in the Netherlands, and to offer insights into factors that are related with under‐ or overestimation of perceived flood risk. We analyzed survey data of 1,848 homeowners in the Dutch river delta and examine how perceptions of flood probability and damage relate to objective risk assessments, such as safety standards of dikes, as well as heuristics, including the availability heuristic and the affect heuristic. Results show that many Dutch floodplain inhabitants significantly overestimate the probability, but underestimate the maximum expected water level of a flood. We further observe that many respondents apply the availability heuristic. [ABSTRACT FROM AUTHOR]

Flood risk in urban areas around the world is increasing due to socio-economic development and climate change. Urban climate adaptation measures are beneficial over the longer term, particularly in coastal areas, yet the upfront costs of such measures are significant. Moreover, public actors responsible for adaptation to flood risk face constrained budgets. A promising strategy for overcoming these constraints and enabling greater adaptation investment is land reclamation that includes adaptation, i.e. flood risk reduction. Land reclamation in high-value urban areas can generate substantial revenues through the sale or lease of new land, or taxes on increased economic activities, thus offsetting public adaptation investments. This paper explores the potential of land reclamation for leveraging public adaptation investments and associated distributional issues, by analysing 3 urban land reclamation and adaptation projects in Germany, the Netherlands and the Maldives. We find that all projects have leveraging potential, and leveraging in projects primarily aimed at land creation is particularly high. Further, due to low adaptation costs needed to protect revenue streams in such projects, these investments appear to be 'low-regret'. Regarding distributional aspects, high project costs and limited public budgets for adaptation constrain public actors' ability to ensure equitable outcomes through planning instruments, for example, social housing. Further, in implementation, competition for project benefits can lead to further inequalities. We conclude that urban land reclamation presents a significant opportunity to leverage public adaptation investments under certain conditions. We further outline future research needs including to extend land-based financing theory from related urban infrastructure sectors to inform the design of equitable governance arrangements and to better understand the role of such urban land reclamation projects in regional or national development pathways. [ABSTRACT FROM AUTHOR]

As dunes and larger‐scale bed forms such as bars coexist in rivers, the question arises whether dune dynamics are influenced by interaction with the underlying bed topography. The present study aims to establish the degree to which dune characteristics in two and three dimensions are influenced by an underlying topography dominated by non‐migrating bars. As a case study, a 20 km stretch in the Waal River in the Netherlands is selected, which represents a sand‐bed lowland river. At this location, longitudinal training dams (LTDs) have recently been constructed to ensure sufficient navigation depth during periods with low water levels, and to reduce flood risk. By using data covering 2‐year‐long periods before and after LTD construction, the robustness of the results is investigated. Before LTD construction, dune characteristics show large variability both spatially and temporally, with dunes being longer, lower, less steep and having a lower lee side angle when they are located on bar tops. The correlation between dune characteristics and the underlying bed topography is disrupted by unsteady conditions for which the dunes are in a state of transition. The bar pattern causes tilting of dune crest lines, which may result from a transverse gradient in bedload sediment transport. As a result of LTD construction, the hydraulic and morphological conditions have changed significantly. Despite this, the main conclusions still hold, which strengthens the validity of the results. ©2020 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd. [ABSTRACT FROM AUTHOR]

• We develop a framework for analysing the role of Science Policy Interfaces in Flood Risk Governance. • We apply this framework to England, France and the Netherlands using policy analysis and stakeholder interviews. • SPIs help diversify FRM; increase their connectivity, facilitate decentralisation of FRM and foster inter-country learning. • SPIs can steer FRG, either along existing pathways, or towards new and potentially transformative change. • SPIs are an underexposed factor explaining dynamics in flood risk governance which merits more systematic empirical study. In the face of increasing threats from flooding, there are growing calls to strengthen and improve arrangements of flood risk governance (FRG). This endeavour requires an appreciation of the multitude of factors stabilising and driving governance dynamics. So-called catalyst flood events, policy champions and advocacy coalitions have tended to dominate this study to date, whilst the potential role played by Science Policy Interfaces (SPIs) has been somewhat neglected and often approached in a reductionist and fragmented way. This paper addresses this gap by drawing from in-depth policy analysis and stakeholder interviews conducted within England, France and the Netherlands under the auspices of the EU-FP7 STAR-FLOOD project. The analysis reveals four prominent ways in which SPIs shape FRG, by i) facilitating the diversification of Flood Risk Management (FRM) strategies; ii) increasing their connectivity, iii) facilitating a decentralisation of FRM and iv) fostering inter-country learning. It identifies different roles of specific interfaces (structures) and interfacing mechanisms (processes) in shaping governance dynamics. This way, the analysis reveals various 'entry points' through which SPIs can steer FRG, either along existing pathways, or towards new and potentially transformative change. The study shows that SPIs are a hitherto underexposed factor explaining dynamics in flood risk governance which merits additional systematic empirical study. [ABSTRACT FROM AUTHOR]

An accurate prediction of the breach widening rate after the onset of a levee failure is essential for flood risk assessments. Current state-of-the-art analytical breach growth relations are empirical in nature. The large variety in loading conditions, levee design, and levee construction material, combined with the limited amount of accurate measurements of breach growth, make the development of accurate empirical breach growth relations challenging. In this paper, a process-based breach widening relation is presented for levees constructed of dilatant soils. The process-based relation is derived from the weir flow equation and a process-based erosion equation. The breach widening relation can account for the effects of variations in soil parameters. For those cases for which soil parameters are unknown, a calibrated catch-all-coefficient is provided. The relation is benchmarked against the state-of-the-art empirical breach growth relation used in the Netherlands and validated against data on historical levee failures and experimental data. [ABSTRACT FROM AUTHOR]

• Statistical uncertainty was hard to interpret by water board professionals. • Uncertainty information is underutilized in flood risk decision problems. • During decisions, uncertainty information shifts from quantitative to qualitative. • Well-structured decision problems are essential. • We recommend designing of decision models prior to a project. Uncertainty analysis is not typically performed in hydrological and hydraulic modelling. This is problematic because this may lead to inefficient decision making in water management. We therefore explored the role of statistical knowledge on uncertainty in decision-making processes in long term flood risk management within the context of regional water boards in the Netherlands. Research questions were: (1) in which parts of flood risk management statistical information about uncertainty is presented to professionals of district water boards, and in which forms?; (2) how is this information interpreted and used by these professionals, and how does this influence decision-making processes in district water boards?; and (3) how can communication about statistically quantified uncertainty be improved? To answer these questions we conducted interviews and surveys among professionals and board members of Dutch district water boards. Results suggest that statistical information on uncertainty is hard to interpret by professionals. The amount of statistical information on uncertainty strongly reduces during the decision making process, during which the information transforms from quantitative to qualitative. As a result the statistical information on uncertainty is not utilized to solve flood risk management decision problems. These decision problems are not formulated within statistical frameworks for decision making, and statistical information on uncertainty is not collected and presented with the purpose to be input of such frameworks. Practical recommendations for long term flood risk management are discussed. [ABSTRACT FROM AUTHOR]

This paper situates climate resilience as a solution to urban flooding under racial capitalism by examining its implementation across Amsterdam, the Netherlands, and Dhaka, Bangladesh. The necessity for cities to enhance their climate resilience in the face of urban flooding has become a dominant refrain in the global governance of climate change. This is the case in both the Netherlands and Bangladesh, locations that are respectively and divergently framed as global "masters" of water management and needy "apprentices" requiring international guidance on flood control and economic development. I place these two sites in conversation with one another to break down constructed ontological and epistemological divides across the global North and global South, drawing attention to the relationship between contemporary urban climate resilience policies and broader histories of socio-ecological injustice under racial capitalism. I argue that urban climate resilience policies across Amsterdam and Dhaka renegotiate and reconfigure techniques, practices and ideologies of racial and class-based inequality in response to threats and insecurity posed by climate change within and across urban scales. Looking across Amsterdam and Dhaka, I demonstrate that climate resilience policies primarily aim to protect status quo forms of capital accumulation at the urban scale rather than enact comprehensive climate adaptation measures. As a result, the ineffective and inequitable nature of resilience continues to support highly racially uneven urban socio-natures across the global North and global South, enabled by racist imaginaries where communities in the global South – particularly the urban poor – are framed as being undeserving of environmental justice. [ABSTRACT FROM AUTHOR]

• Participatory capacity building has potential for bilateral knowledge sharing. • Citizens and authorities share knowledge more easily in informal and equal context. • Using existing capacity for building (other) capacity may form a double-edged sword. • The role researchers play in participation requires careful consideration. Social capacity building is increasingly suggested as strategy for supporting vulnerable communities in dealing with natural hazards such as floods. However, research on the empirical implementation of social capacity building is still limited. This paper presents a conceptualisation and an empirical case study of participatory social capacity building for flood risk mitigation in the Netherlands. We designed and implemented two distinct participatory pilots, studied the processes and outcomes to assess what factors influence social capacity building, and assessed how existing capacity may be leveraged. Social capacity is herein conceptualised as consisting of five dimensions: Knowledge, Motivation, Networks, Finance, and Participation. The first pilot included a walk in flood-prone areas and a discussion session with citizens and flood risk authority representatives. The second pilot involved elementary school pupils interviewing senior citizens with flood experience. Based on qualitative observation and analysis of the processes, findings suggest there is good potential for mutual sharing of knowledge if all participating actors are equal in the participatory process, and that informal settings open up debates, but also that leveraging existing social capacities might inadvertently impede the dissemination of knowledge that is vital in coping with (future) disaster risks. [ABSTRACT FROM AUTHOR]

Many urban residences are insufficiently prepared for fluvial, pluvial or coastal floods, owing to a lack of accurate information on flood risk. This article analyzes how risk communication can improve disaster risk reduction by overcoming the expert–layperson gap. Building on interviews in three cities in the Netherlands, it applies Q methodology to identify four perspectives on flood risk communication. To promote greater private residential involvement in flood risk adaptation, communication should address all four rationalities. [ABSTRACT FROM AUTHOR]

Post-flood policies and compensation regimes tend to focus on the resilience of public spaces and improving the adaptive capacity of future private property developments. This article focuses on the instruments associated with the resilience of existing privately owned residential buildings from the perspective of post-flood policies and compensation regimes. By reviewing the relevant legal and policy landscapes it aims to provide mutual lessons learned between the EU, its member states and the US and to set forth generally applicable recommendations for improving post-flood policies for existing buildings. [ABSTRACT FROM AUTHOR]

It is not uncommon for a flood defence to be combined with other societal uses as a multifunctional flood defence, from housing in urban areas to nature conservation in rural areas. The assessment of the safety of multifunctional flood defences is often done using conservative estimates. This study synthesizes new probabilistic approaches to evaluate the safety of multifunctional flood defences employed in the Netherlands and explores the results of these approaches. In this paper a case representing a typical Dutch river dike combining a flood safety function with a nature and housing function is assessed by its probability of failure for multiple reinforcement strategies considering multiple relevant failure mechanisms. Results show how the conservative estimates of multifunctional flood defences lead to a systematic underestimation of the reliability of these dikes. Furthermore, in a probabilistic assessment uncertainties introduced by multifunctional elements affect the level of safety of the dike proportional to the reliability of the dike itself. Hence, dikes with higher protection levels are more suitable to be combined with potentially harmful uses for safety, whereas dikes with low protection levels can benefit most from uses that contribute to safety. [ABSTRACT FROM AUTHOR]

Climate change adaptation creates significant challenges for decision makers in the flood risk‐management policy domain. Given the complex characteristics of climate change, adaptive approaches (which can be adjusted as circumstances evolve) are deemed necessary to deal with a range of uncertainties around flood hazard and its impacts and associated risks. The question whether implementing adaptive approaches is successful highly depends upon how the administrative tradition of a country enable or hinder applying a more adaptive approach. In this article, we discern how the administrative tradition in the Netherlands, England, and New Zealand impact upon the introduction of adaptive flood risk management approaches. Using the concept of administrative traditions, we aim to explain the similarities and/or differences in how adaptive strategies are shaped and implemented in the three different state flood management regimes and furthermore, which aspects related to administrative traditions are enablers or barriers to innovation in these processes. [ABSTRACT FROM AUTHOR]

In the Netherlands, the central government, water authorities, provinces and municipalities are working together on a new Delta Program on Flood Risk Management and Fresh Water Supply (DP). Its primary goal is to protect the Netherlands against floods and ensure the availability of fresh water, now and for future generations. The DP has developed a new, adaptive management concept: the Adaptive Delta Management (ADM) approach. ADM is defined as ‘a smart and intelligent way of taking account of uncertainties and dependencies in decision-making on Delta Management with a view to reducing the risk of overspending or underinvestment’. Important features of DP are: (i) involving multiple stakeholders in a joint decision-making process to enhance ownership, legitimacy and feasibility; (ii) taking a risk-based perspective; (iii) adopting a flexible approach in possible strategies by valuing flexibility with regard to the timing of implementation and (iv) interlinking various investment agendas and looking for opportunities for mainstreaming with planned investments. Along similar lines, a Bangladesh Delta Plan 2100 (BDP 2100) is being devised to achieve long-term sustainable socio-economic development and provide safety in the face of disasters through adaptive water governance in Bangladesh. It embodies a holistic, integrated vision, adaptive strategies and a long-term investment agenda for the Bangladesh Delta. The Plan is scheduled to be finalized in 2017. ADM is not an approach that can be transferred easily from one country to another as it demands a fundamental change in institutional capacity at multiple levels including new knowledge and skills, relationships and policy frameworks, and, hence, depends on the local socio-economic characteristics, culture and governance. This paper explores the challenges and opportunities for successful formulation and implementation of BDP 2100. [ABSTRACT FROM AUTHOR]

Rivers are among the most heavily managed landscapes worldwide. The meanings people ascribe to river landscapes and their preferences for management have implications for public support for management decisions. This paper reports on a postal survey (N = 1102) on perceived landscape qualities (place attachment, scenic beauty and safety perception) and public perceptions of a planned river intervention in four residential areas along the river Waal (The Netherlands). The objectives of this study were to (1) examine the relationship between place attachment and socio-demographic and geographic variables, and (2) explore the role of perceived landscape qualities in public perceptions of a planned river intervention. Multiple regression analyses showed that socio-demographic and geographic variables explain 21–41% of variation in place attachment dimensions (including place identity, place dependence, social bonding, and narrative bonding). We found that local residents have intermediate to strong bonds with the area and that village residents were more attached than city residents. Narrative bonding was tested as a separate dimension, which resulted in a coherent set of statements with good reliability. Overall, the planned intervention was positively evaluated, especially in terms of improving flood safety. Social bonding, scenic beauty, and recreational value correlated positively with the evaluation scores. Our findings emphasize the importance of place as a social environment in residents’ responses to re-landscaping river interventions and we discuss opportunities to engage local communities and sustain social processes in river management. [ABSTRACT FROM AUTHOR]

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Copyright of Irrigation & Drainage is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Given the large investments in dike construction and reinforcements, optimisation of these interventions could contribute to significant cost savings. In this study, a probabilistic method is developed for obtaining the geometry of a river dike crosssection that fulfils a specified target reliability at a minimal cost. The method takes into account multiple relevant failure mechanisms and various geometric parameters of the dike. Large numbers of cross-sections are generated and the reliability for each section is computed using FORM, Monte Carlo sampling, and numerical integration. The method is applied to several cases representing typical river dike profiles that are found in the Netherlands. Results show that for the optimal geometry the largest fraction of the target failure probability is assigned to those mechanisms with a relatively high cost of reinforcement. Also, comparison with the current semi-probabilistic design guidelines shows that a decrease in costs of up to 15% could be reached with the new optimisation method. [ABSTRACT FROM AUTHOR]

The Netherlands faces a significant flood risk task. In order to remain a safe place to live the Netherlands has to upgrade its extensive flood risk protection system. This results in an elevation and reinforcement task for many of the Netherlands water barriers. When those barriers are positioned in an open landscape, the technical reinforcement is often easy to embed specially. However, many barriers have been built over the years making the reinforcement into a challenging spatial assignment. This article shows different case study examples of a research by design study (performed in the broader context of the Dutch Delta programme) that explores integral design solutions for flood risk and spatial (re)development. The Houston Galveston Bay case study demonstrates the international applicability of the research by design method. [ABSTRACT FROM AUTHOR]

Traditionally, governmental authorities in the Netherlands have a strong focus on the construction and maintenance of flood defences, such as dikes and dams. The last decades, however, there has been a growing awareness of the importance of spatial planning for flood risk management. With the arrival of the Floods Directive (2007), it is likely that even more attention will be paid to sustainable spatial planning to reduce flood risks. From an institutional perspective, this paper explores the way in which the Netherlands is now attempting to further integrate water management and spatial planning in the preparation of its first Flood Risk Management Plans. The current internal policy debate centres around five important issues concerning the required measures, instruments, rules, governance styles and time perspectives. Maintaining its strong, engineering-based water management tradition, and at the same time institutionalising a framework for a more holistic flood risk management that comprises not only rules and regulations for probability reduction but also for impact reduction through sustainable spatial planning turns out to be a challenging task. The recently established national Delta Commissioner (2012) could be an important stimulus for the further integration and innovation of water management and spatial planning. [ABSTRACT FROM AUTHOR]