Graham’s £220M Oxford flood defence: design and earthworks notes for engineers
Reviewed by Tom Sullivan
First reported on New Civil Engineer
30 Second Briefing
Graham has secured a £220M contract from the Environment Agency to deliver the Oxford Flood Alleviation Scheme (OFAS), described as one of England’s most significant flood defence projects. The scheme will create a new flood relief channel around Oxford, integrating earth embankments, lowered floodplains and new river crossings to divert peak flows from the Thames and its tributaries. For civil and geotechnical teams, the project signals substantial packages in large-scale earthworks, river training structures and foundation works in a constrained urban floodplain.
Technical Brief
- Contract value of £220M sets a major capex benchmark for UK fluvial defence schemes.
Our Take
Graham’s win on the Oxford Flood Alleviation Scheme follows its recent award for the Didcot–Culham river crossing in Oxfordshire, signalling that local authorities in the county are consolidating major water-related and transport works with a single Tier 1 contractor, which can simplify interfaces but concentrates delivery risk.
Across our infrastructure coverage, Graham is increasingly present on complex, multi‑stakeholder schemes (from the University of Manchester’s £530m Passivhaus campus to Sky’s Livingston campus), suggesting the Environment Agency is buying into a contractor with a current track record on large, coordination‑heavy UK projects.
The Environment Agency’s choice of Graham for OFAS comes soon after Graham adopted MukAway as its primary materials management platform, which is likely to be relevant on a linear flood scheme in Oxford where spoil logistics, haul routes and environmental compliance are politically and technically sensitive.
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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