Abstract
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.
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