Marshalls on Severn Trent £6m AMP8 framework: precast tank design notes for engineers
Reviewed by Tom Sullivan
First reported on New Civil Engineer
30 Second Briefing
Marshalls Civils & Drainage has secured a place on Severn Trent Water’s new £6M AMP8 framework to supply precast concrete storm tanks across the utility’s network. The agreement will cover factory-produced units for stormwater storage and attenuation, supporting Severn Trent’s AMP8 capital programme and standardising tank solutions across multiple wastewater and drainage schemes. For civil and drainage designers, this signals wider use of offsite-manufactured precast tanks in UK water projects, with implications for hydraulic design, installation sequencing and site footprint.
Technical Brief
- Centralised framework procurement should reduce per-unit design iterations and approvals across multiple wastewater schemes.
- Standardised tank geometries will influence excavation footprints, crane selection and temporary works strategies on constrained sites.
- Offsite manufacture enables parallel working with on-site pipeline, base slab and access chamber construction.
- For designers, a fixed supplier list narrows acceptable concrete specifications, joint details and access cover interfaces.
Our Take
Severn Trent Water’s £6m framework with Marshalls Civils & Drainage sits against a much larger capital delivery pipeline, with our coverage flagging a separate Severn Trent programme of up to £25bn over the next 8–15 years, suggesting this award could be an entry point to more substantial AMP8 work packages.
The AMP8 timing aligns Marshalls Civils & Drainage with other Severn Trent initiatives such as the £45m tank-cover tender targeting greenhouse gas capture, indicating that suppliers on these frameworks may increasingly be expected to support carbon and odour-control objectives in their product specifications.
Recent Severn Trent contracts, including Barhale’s £9.5m resilience and stormwater schemes, show a pattern of deep-shaft and storage-heavy works; being on an AMP8 framework positions Marshalls Civils & Drainage to supply precast and drainage components into similarly complex, below-ground infrastructure across the Midlands network.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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