In times of increasing pressures on water resources, the integrated management of the resource is a central policy objective. While there exists encompassing research about the concept of integrated water resources management (IWRM), much remains to be studied regarding the integration of water-related policies. Water resources management profits when policy actors coordinate their demands and actions across policy sectors, territorial entities, and decision-making levels within a water basin. However, actors are bound by the policy framework, which organizes water resources management in defined sectors and, over time, develop into independent and specialized policy pillars. A growing number of policies increases the need to integrate those policies over time following the institutional resources regime (IRR) framework. However, an increasing number of policies also proves challenging in establishing an integrated, coherent regime compliant with IWRM. In this study, we analyze flood risk management policies and find an almost exponential increase in policies over time, while flood risks and damage have not decreased in parallel. We address this empirical puzzle with an in-depth analysis of the design of Swiss flood risk management policies over time. To this end, we survey the opinion of 146 flood experts on the importance of ten policy design indicators in three flood-prone regions in Switzerland. Flood risk management experts attribute particular importance to policy designs characterized by integration, a sufficient budget for policy implementation, and coercive instruments and sanctions. We then compare survey results to the ways in which Swiss policies have been designed in legislation across policy sectors related to flood risk management over the last 169 years. We find that policy designs follow a national policy style. Placing these results in local contexts, we explain why the design of policies represents both a challenge and opportunity for policy-makers involved in flood risk management.

Despite an increasing number of people exposed to flood risks in Europe, flood risk perception remains low and effective flood risk management policies are rarely implemented. It becomes increasingly important to understand how local governments can design effective flood risk management policies to address flood risks. In this article, we study whether high flood exposure and flood risk perception correlate with the demand for a specific design of flood risk management policies. We take the ideal case of Switzerland and analyze flood risk management portfolios in 18 flood-prone municipalities along the Aare River. We introduce a novel combination of risk analysis and public policy data: we analyze correlations between recorded flood exposure data and survey data on flood risk perception and policy preferences for selected flood risk management measures. Our results indicate that local governments with high flood risk perception tend to prefer non-structural measures, such as spatial planning and ecological river restoration, to infrastructure measures. In contrast, flood exposure is neither linked to flood risk perception nor to policy preferences. We conclude that flood risk perception is key: it can decisively affect local governments’ preferences to implement specific diversified policy portfolios including more preventive or integrated flood risk management measures. These findings imply that local governments in flood-prone areas should invest in raising their population’s awareness capacity of flood risks and keep it high during periods without flooding.

Complex environmental problems affect multiple policy sectors, decision-making levels and territories simultaneously and, as such, call for encompassing policy solutions. However, no consensus exists on how encompassing policy solutions are designed. A trade-off persists between single instruments, leading to sectoral "silo" thinking and complex instrument mixes, constituting the risk of not being implemented due to actors' objections. Policy designs, including balanced policy mixes, can fulfil various goals, interests and priorities; address numerous challenges; and involve multiple actors. Such balanced policy mixes, however, can only manage complex environmental problems successfully when supported by actors belonging to different sectors, levels and territories. This study therefore analyses the political feasibility of balanced instrument mixes via actors' policy preferences in the case of Swiss flood risk management. Public and private actors involved in flood risk management are surveyed on their preferred instrument mixes. Based on these preference