The project was devised primarily to meet the new Effluent Quality Standards but to also make significant environmental improvements to the River Lea and surrounding areas. An added benefit was to address a long term flooding issue that had prevailed on the site for many years when the River Lea level was high. As Principal Contractor, Murphy managed all aspects of the design from Hydraulic, Civil and Structural designs, through to MEICA and Temporary Works designs. Temporary works designs were completed by our in-house Temporary Works department, while the permanent works designs were completed in conjunction with our sub-contract partners: AECOM for civil design and Nomenca for MEICA.
The new pumping station required an internal diameter of 18.5m and an invert depth of 21m to provide operational freeboard to the invert of a low level sewer, which was 15m below ground level. The new pumping station included two dry wells to house the associated controls and pumps. To account for the permanent shaft design, which included a 600mm thick in-situ concrete internal lining and a 3.5m deep base plug to resist flotation forces, the temporary shaft required a 24m deep dig to formation.