Turning Floods into Assets: Policy and Development Implications of Rainwater Harvesting in Dar es Salaam

Dar es Salaam is highly vulnerable to recurrent flood disasters, yet current mitigation efforts have had limited success. This study explores the role of rainwater harvesting (RWH) as a sustainable and cost-effective strategy to reduce flood risks in the city, addressing a critical gap in both research and policy in Tanzania. Through a comprehensive literature review, the study finds that excessive surface runoff significantly contributes to urban flooding, and RWH offers a practical solution by capturing and managing rainwater before it causes damage. Despite global recognition of RWH’s benefits, Tanzania has yet to integrate it effectively into flood management policies and urban planning. The study concludes that adopting RWH can transform flood challenges into opportunities for water conservation and disaster resilience. It recommends capacity building for communities in flood-prone areas to implement affordable RWH technologies and calls for strengthened urban planning regulations that mandate RWH integration in building approvals and infrastructure projects. These steps are essential for developing sustainable cities that are better prepared for climate-related water challenges.