The Southfields Combined Sewer Overflow (CSO) scheme is being delivered to enhance local drainage performance, increase stormwater storage capacity and provide a modern, resilient CSO asset while keeping disruption to residents and nearby school operations to a minimum.
The project includes the replacement and upgrade of existing sewer infrastructure, the construction of a 10.5‑metre‑diameter, 11‑metre‑deep CSO shaft and full integration with the existing sewer network to ensure safe, reliable access for long‑term operation and maintenance. Delivery involves both enabling and main construction activities, ranging from site establishment, haul road construction, ground preparation, testing and temporary works to the installation of new drainage systems, manholes, mechanical and electrical components and full testing and commissioning.
To meet critical deadlines, the programme has been phased around school holiday periods, supported by early contractor and supply‑chain engagement and robust coordination across civil, drainage, M&E, testing and traffic‑management teams. The scheme also addresses challenging ground conditions, such as rock and coal, through detailed surveys and controlled excavation while maintaining strict environmental and traffic controls due to the site’s proximity to schools, residential areas and highway networks.
