This report uses the OECD Principles on Water Governance as a tool for multi-stakeholder policy dialogue and practical assessment of the performance of flood governance systems. It applies the Principles to flood-prone contexts to help strengthen governance frameworks for managing the risks of “too much” water. By 2050, 1.6 billion people will be at risk of flooding, affecting nearly 20% of the world’s population at an increasing rate and many times over with dire social, economic and environmental consequences. In this report, a checklist is proposed as a self-assessment tool for stakeholders in flood management, based on lessons learned from 27 case studies that feature practical experiences and highlight common features and key challenges in flood governance.