Flooding in urban areas is a growing problem, as the world’s cities expand and storms become more intense and variable. Piscinões (big pools) are São Paulo’s primary strategy for reducing flooding. While often effective for flood control, these single-purpose basins also divide neighborhoods, concentrate pollutants, and require costly maintenance. With officials and experts in São Paulo, this team will create landscape-based design guidelines for piscinões that can work at large and small scales to enhance human communities and urban ecosystems. These multifunctional pools offer a new model for urban living with water.