Groundworks in Egham
From the Thames floodplain to Englefield Green. We deliver expert flood defense and structural engineering for Egham and the Runnymede area.
Engineered for the Thames Valley
Egham presents two distinct challenges: the high water table of the Thames basin and the shifting clays of Cooper's Hill. We own the dewatering equipment and piling rigs to manage both environments effectively.
River Gravels & Clay Hills
The town center (TW20) sits predominantly on River Terrace Gravels, which are highly permeable but come with a high water table due to the proximity of the Thames. Excavations here often require sheet piling and dewatering.
In contrast, rising up towards Englefield Green and the University, the ground shifts to London Clay. Here, the risk changes from flooding to subsidence/heave, necessitating deep bored piles for stability.
We utilize well-point dewatering and waterproof concrete (Type B systems) for basements and foundations near the river, ensuring a dry build phase.
For projects in Englefield Green, we install compressible heave board (Clayboard) under reinforced slabs to absorb soil expansion.
Flood Defense Strategy
With large parts of Egham falling into Flood Zone 2 and 3, securing Environment Agency approval is key. We specialize in Property Level Flood Resilience (PLFR) for new builds and extensions.
Attenuation Tanks
Large capacity storm crates installed under driveways to hold surge water and release it at a controlled rate, compliant with Runnymede SuDS.
Non-Return Valves
Crucial for Egham High Street and surrounding roads to prevent public sewer back-surge entering private property during floods.
Permeable Paving
We install porous surfacing for parking areas, allowing water to infiltrate naturally into the gravel substrate rather than overloading drains.
Planning Resources
Runnymede Planning
Check applications and conservation constraints for Egham and Thorpe.
Visit Portal →Flood Map (EA)
Check the long term flood risk for your postcode in the Thames basin.
Check Postcode →Thames Water
Developer services for build-over agreements and sewer connections.
Developer Services →