posted on 9th Feb 2023 14:22
HS2’s plans for the Balsall Common Viaduct in Warwickshire, recently submitted to Solihull Council, incorporate local feedback focussing on environmental sustainability, landscape integration, visual connectivity and public access. HS2’s main works contractor, Balfour Beatty VINCI (BBV), supported by a Design Joint Venture of Mott MacDonald and Systra together with architects Weston Williamson + Partners, have engaged with people in the local area over the last year to gather feedback on the viaduct - a 425-metre-long section of the UK’s new high speed rail line.
Understanding the landscape context was a key focus of the design, allowing the team to create a viaduct that ‘reflects and reveals’ itself within the landscape. Planting and species selection was another key focus, with the plans now including wet woodland planting using native species to the local area; mixed native woodland plants such as midland hawthorn and black poplar, two notable local species; woodland edge planting to provide screening; and hedgerow planting to improve wildlife connections.
Reflecting the historic local growing of flax for weaving into linen, an alternative grass species mix will incorporate blue flowered plants including blue flax, cornflower and forget-me-nots. Bird boxes will be added in the trees in various locations to serve common bird species such as robin, blue tit and great tit. A realignment of Bayleys Brook will increase habitat for fish, aquatic invertebrates and potentially water vole. Design changes have also reduced the size of the railway embankment running parallel to Bayleys Brook by 75 m, improving the resiliency of the area to flooding, and enhancing views through the viaduct to the wider landscape.
To improve connections, the Kenilworth Greenway will be extended to Station Road on the south-eastern side of the existing railway line and a further extension towards Lavender Hall is currently under consideration. Options for cycling and bridleway extensions are also being considered.
BBV will construct a total of 16 piers to carry the viaduct 10 m above ground, crossing over Station Road, Bayleys Brook, Heart of England Way Walk and the local floodplain. Construction refinements have reduced the size of each pier by as much as 17 % for single piers and 28 % for double piers, giving the structure a lighter appearance. Responding to feedback about the look of the viaduct, a section at Station Road will be finished with a bespoke pattern, referencing the local history of the area.