Transforming water management in Llanelli, UK

In Llanelli, South Wales, high volumes of surface water have led to excess discharges from combined sewer overflows into designated shellfish waters and the risk of widespread property flooding. A comprehensive catchment-wide modelling assessment was undertaken to develop a pioneering, community-focused strategy based on retrofitting sustainable drainage systems. This paper outlines the approach taken to develop and compare catchment strategy options; describes the journey through delivery and performance evaluation; and explores the social, environmental and economic constraints and opportunities. The project is a blueprint for integrated catchment management and water-sensitive urban design, promoting best practice in flooding mitigation and climate-change resilience across the UK.