our company

OGI Groundwater Specialists Ltd is an independent, privately owned specialist engineering design, groundwater control and consultancy company predominately servicing the UK construction industry.


Founded in Oxford in 1989 by Dr Stephen Thomas, OGI s expertise is focussed on the design and supervision of groundwater control systems required to lower the water table and reduce artesian pore pressures for large complex underground structures when constructed below the water table.


With more than 25 years of experience of solving groundwater problems, combined with our groundwater modelling skills, OGI provides geotechnical and groundwater engineering designs to overcome challenging and difficult ground conditions encountered during the construction of deep structures, such as basements, bridge footings, tunnels, shafts, swimming pools, underground car parks, and road and rail cuttings.

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OGI’s solutions are practical, innovative, safe to construct and, where possible, simple to install.  We work in close liaison with our client to provide bespoke solutions to their problems, often working within tight logistical, budget and programme constraints. We know from client feedback that our service at tender stage can make the difference between them winning or losing a contract.


In addition to designing systems to lower the water table and piezometric head, OGI has the skills and experience to undertake risk based analysis to assess and then mitigate the wider impact of groundwater control, such as potential settlement of adjacent buildings, ground stresses on surrounding infrastructure, and the environmental impact on water resources.


Despite the relatively small size of our company, we have one of the largest technical teams in the UK that is primarily focussed on solving groundwater engineering problems.  This means that OGI is regularly invited to be a critical part of a wider design team for the development of major projects for the Water, Transport, Energy and Construction industries.