Catchment-Scale Management and Ecological Restoration of the River Thames

Originating in the era of the "Great Stink" (1858), the River Thames has been revived through a multi-stage, integrated catchment strategy: enacting stringent pollution-control legislation, constructing wastewater treatment plants and associated sewer networks, implementing unified basin-wide governance, upgrading to advanced technologies such as the Activated Sludge Process, and introducing market-based mechanisms. Today, the river's water quality has reverted to pre-industrial levels, supporting over 100 fish species and 350 species of aquatic invertebrates—including iconic salmon and trout. The commissioning of the Thames Tideway Tunnel (the "Super Sewer") in 2025 further fortifies this legacy by intercepting sewage overflows.