On Tuesday 3rd March at 1pm, Construction Matters turns its attention to something most people never see - yet it can shape the success or failure of an entire development.

Groundwater.

It sits quietly beneath our feet. Out of sight. Often out of mind. Yet when it behaves in unexpected ways, or carries historic contamination, it can bring progress to a halt.

This week we will be joined by Frank O'Donnell, Principal Consultant at Groundwater Dynamics Ltd. Frank works at the sharp end of hydrogeology assessment, dealing with the real-world consequences of what lies below the surface.

For developers, engineers and contractors, ground conditions are rarely straightforward. A desktop report might suggest low risk, yet intrusive investigation can reveal something very different. Former industrial land, infilled ground, buried structures - all can interact with groundwater in ways that affect design, foundations, remediation strategy and long-term liability.

From a construction perspective, groundwater is not simply a technical detail. It influences piling design, basement waterproofing, drainage strategy and programme certainty. If water levels fluctuate, if contaminants migrate, or if unexpected pathways are discovered, costs can rise quickly.

In the current climate, where regeneration and brownfield development remain central to housing delivery, understanding subsurface conditions has never been more important. Planning authorities are increasingly cautious. Environmental regulators expect robust risk assessments. Funders and insurers look for clarity.

Hydrogeological input often sits behind the scenes of planning conditions and environmental sign-off. Yet without it, many schemes would never move forward.

During the discussion, it will be interesting to explore how groundwater risk is assessed in practice, how subjective professional judgement plays its part, and where projects most commonly run into difficulty. The balance between proportionate investigation and over-cautious delay is a real one for the industry.

We will also reflect on how early-stage assessment can influence overall build confidence. When ground risk is properly understood, design decisions tend to be firmer. When it is not, uncertainty lingers.

Construction is visible. Concrete, steel, cladding, cranes. Groundwater is invisible, yet its influence is constant.

On Tuesday 3rd March at 1pm, join us as we bring this hidden layer into the open.

Construction Matters airs live at 1pm on Tuesdays.

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