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The issues

Groundwater is a major constraint in underground construction projects.

The impacts of poor adaptation of your project to the hydrogeological system and its environment can be multiple:

  • Impossibility of dewatering a trench
  • Significant impact of pumping or injection operations on third parties, with a risk of causing damage
  • Failure to comply with regulations, with a risk of a fine or the construction being stopped
  • Consequences on the lifespan of the structure or its end use
  • Impacts on costs or the duration of the construction work
  • Environmental impact, etc.
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Our services

  • Estimation of characteristic groundwater levels according DTU-14-1 and the Eurocodes, the only standardised groundwater levels
  • Hydrodynamic characterisation of aquifers
  • Hydrogeological impact assessments for all kinds of projects
  • groundwater lowering in the works or final phase (dewatering and impact)
  • Injection structures
  • Diagnosis of water inflow and expert assessment of damage done by underground waters
  • Related regulatory dossiers: declaration or authorisation dossier under the Water Law, the Environment Code, the Mining Code, etc.
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Alternative rainwater management

The issues

Covering the period 2022-2024, the French national sustainable rainwater management plan aims to:

  • better integrate rainwater management into territorial planning policies,
  • reduce its impact on the quality of water,
  • make this water no longer a constraint that has to be managed, but a resource that can be mobilised, in particular with a  view to adapting cities to climate change.

De-sealing cities is in fact one of the main levers in the fight against runoff and urban flooding and the improvement of the status of aquatic environments

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Our services

In line with this plan, we take care to include optimum management of runoff waters in our recommendations so as to limit extra surface water and encourage the replenishment of the groundwater table.

Among the possible optimisations of runoff water management, it is possible to intervene on provisional storage solutions before re-use of the water (sanitary water, firefighting water, plant watering water, washing water) or infiltration in the case of new developments of de-sealing.

  • Dimensioning (unit or project) of a rainwater management system (retention basin, swale, soakaway, ditch or infiltration trench, etc.)
  • Administrative formalities required under the Environment Code
  • Modelling 

Focus > BIM serving rainwater management

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Industrial sites

The issues

Facilities classified as constituting a risk to the environment – ICPEs, and in particular non-hazardous waste storage facilities  (known as "ISDND" in France), hazardous waste storage facilities ("ISDD") or inert waste facilities ("ISDI"), quarries, mining sites: for all these facilities, it is essential to have a very detailed knowledge of the subsurface conditions to be able to use appropriate protective, management and control devices that guarantee the integrity of the natural environment.

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Our services

  • Feasibility study
  • Design assignment
  • Monitoring works
  • Diagnosis of storage facilities
  • Post-exploitation/stability follow-up
  • Characterisation of passive barriers
  • Landfill remediation, by traditional processes or after material sorting and resource recovery
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We also carry out the following missions:

  • Diagnosis of water inflow and expert assessment of damage done by underground waters
  • Dyke leak diagnoses
  • Water search Drinking water, industrial water
  • On-site sewage facilities
  • Expert assessments for cemetery extensions
  • Diagnosis of wetland areas
  • Inspections of geosynthetics
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Data interpretation & modelling

Our hydrogeologist experts use different calculation and modelling software programmes developed for hydrogeotechnical engineering, to analyse and model the impact of your projects on aquifers and complex projects.

  • On-site permeability testing on the surface and deep underground in line with all the relevant standards
  • Permeability measurements in the lab
  • Piezometric maps
  • Excavation dewatering calculations
  • Drainage calculations
  • Injection calculations
  • Stability calculations linked to uplift
  • Hydrogeological impact and incidence studies by finite difference modelling

The 2D or 3D tools used for geometrically displaying aquifers and finite difference modelling include Visual Modflow, Surfer, Feflow.

Key figures

Fondasol Group in 2023

100 M€





of the capital held by employees


sites worldwide