HS2 Main Works Civils Contract – River Cole
Scope and Delivery
HS2 is the UK’s state-of-the-art high-speed line, critical for tackling carbon reduction. It will provide much-needed rail capacity across the country, and is integral to rail projects in the North and Midlands. HS2 is Britain’s biggest environment project, delivering miles of ecological and landscape investments alongside construction. SYSTRA is working in a Design Joint Venture with Mott MacDonald, supporting contractor Balfour Beatty VINCI (BBV) on Lots N1 and N2, which are between the Long Itchington Wood Green tunnel and the Delta Junction/Birmingham Spur and from the Delta Junction to the West Coast Main Line tie-in respectively.
SYSTRA is providing technical direction and advice regarding the hydraulic modelling, optioneering, replacement flood storage design and analysis, and reporting and presentating to HS2 and the regulator, the Environment Agency.
As part of our work we were instructed to undertake a high-level optimisation of the design, which included:
- Moving viaduct embankments out of the floodplain
- Adding additional flood relief culverts
- Changing Manor Drive overbridge to a viaduct
- Remodelling river realignment
- Remodelling replacement floodplain storage
During the high-level optimisation, over 60 hydraulic model scenarios were configured and run to identify, at a high level, a cost-effective solution to mitigate the increased flood risk. Through consultation with HS2 and the Environment Agency, the preferred option of widening was selected.