Storm water systems' performance: assessment framework application to Portuguese water utilities

Performance assessment is recognized as an important management tool for urban water systems. This article describes the application of a performance assessment framework for storm water systems, in collaboration with two Portuguese urban water utilities. A performance assessment system was built for each water utility, including objectives, assessment criteria and performance metrics. The results showed the existence of areas vulnerable to flooding occurrences and the need for investment in rehabilitation. The application of the performance assessment framework supports the identification of systems' vulnerabilities and priorities for intervention. Opportunities and suggestions for improving data collection procedures are identified.