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Fast flowing trunk sewer beneath Wembley’s PINK Coach & Car Park

The award-winning PINK Coach & Car Park at Wembley Stadium

As part of the Wembley PINK Coach & Car Park Project, Europe’s first multi-storey steel coach and car park, we were appointed to accurately plot the alignment and internal extent of a large diameter, fast flowing trunk sewer running beneath the proposed development site.

This particular sewer has historically been very difficult to survey due to its high flow volumes, which cannot be effectively diverted or throttled to facilitate more conventional survey solutions. 

Old Street roundabout
Wembley pink car park Wembley pink car park

What we did

We were pleased to take on the challenge and conducted a detailed initial inspection of the sewer and its access points  in late 2017, before devising an autonomous floatation solution to map the alignment and internal structure without personnel putting themselves at risk by working near the flow. The survey itself was controlled autonomously from surface level while working closely with the Thames Water Regional Trunk Sewerage Team and IAB (Independent Authorising Body) to ensure that the process ran smoothly and safely. This enabled subsequent surveys to be conducted at key project milestones throughout 2019 as part of an overall piling protection and movement monitoring package to assist the client in managing and mitigating the risk of asset damage. 

With the support of the client in realising the future value of enhanced baseline data, we successfully collated a series of point cloud data files which could be used to accurately record condition and provide movement monitoring validation at key stages to assess the impact of intrusive piling and ground disturbance works nearby. This removed a key risk item for the client and enabled them to proceed in confidence to design and deliver an award-winning project (Double award in the Special Projects Award Category of the British Parking Awards 2020 – Winner for the Special Engineering and the Public Art & Wayfinding Graphics) which provided valuable improvement to the infrastructure and capacity of the Wembley Stadium and the SSE Arena.

Have a look at the time-lapse video showing the impressive construction of the PINK Coach & Car Park at Wembley Stadium

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