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Running from Acton to the Abbey Mills Pumping Station in Stratford, it intercepts tens of millions of tons of sewage that have historically discharged into the tidal Thames each year.

��Ӱֱ�� has been the program manager, working collaboratively as part of an embedded team, alongside our client Tideway and wider supply chain. We have coordinated the implementation of market-leading program management functions through all phases, including planning consents, preliminary and final design, construction oversight, change and risk management, project control, contract management, commissioning and start-up of new facilities.

Our water and tunneling experts helped deliver one of the most challenging wastewater programs in Europe. New sewer relief tunnels intercept the most polluting combined sewer overflows (CSOs), where untreated sewage is being discharged into the tidal Thames. The super sewer will reduce sewer pollution by 95%, alongside other sewage network and treatment upgrades.

With over 25km of new sewer, up to 70m below street-level, the tunnel runs beneath London’s complex network of utilities and London Underground lines. As part of the program, we interfaced with major stakeholders in London, including Transport for London, the Environment Agency, the Port of London Authority, Historic England and the Marine Management Organisation, as well as the numerous London boroughs through which the scheme passes.

Innovative thinking by Tideway at the outset led to a unique business delivery model. Privately financed and delivered by an independent infrastructure provider, regulated by Ofwat, this was the first time that this financing model had been used in the U.K. water sector for strategic, regulated assets. These arrangements are key to make Tideway’s risk profile similar to that of an established U.K. regulated water company. ��Ӱֱ��’ advisory team played an important role in developing the right financial model for success.

Construction of the tunnel started in 2016, following the successful Development Consent Order (DCO) application. This was commonly recognized as the largest and most complex DCO delivered at that time. We program managed the process, which comprised the planning and writing of the 125,000-page DCO submittal, and stakeholder engagement and communications activities (including 48 public hearings), to achieve DCO approval in September 2014.

Given the complexity of this program, some of the greatest challenges faced were controlling costs and delivering to the regulatory schedule. At the outset, we gave the highest priority to developing robust and appropriate contracts. We used value engineering techniques throughout the planning and outline design phases — our continued drive for efficiencies and cost savings resulted in significant savings by adjusting the tunnel alignment and designing the hydraulic system to control overflows to the River Thames without needing to construct at every overflow point. This has minimized disturbance to local residents, while increasing confidence and reducing cost. Throughout the construction phase, we continued to use lean construction, collaborative planning and continuous improvement techniques to deliver to schedule and reduce costs.