Groundwater management

Bibliographic study : collection of information on the geology, potential receivers, supply basins, outlets (catchment, streams, ..)

Field investigations : realization of piezometers, CPT (Cone Penetrometer Test), electrical CPT, geophysical profiles

Groundwater tests, pumping tests, slug tests, tracing tests, monitoring: these tests carried out in situ provide information on the physical parameters of aquifers, such as their permeability, effective porosity, recharge or dispersion

Qualitative assessment of groundwater by sampling

Realization of hydrogeological models. The models are made for porous or fractured aquifers, confined or unconfined aquifers, connected to each other or not. They aim to identify the direction of flow, to simulate the effects of drawdown, pumping or hydraulic barrier on potential receptors such as existing wells, drains, surface water or buried structures. The rising and continuity of the water table during buildings projects can also be simulated

Realization of contaminant transport models. Hydrogeological models serve as a basis for contaminant plume modeling. The history of the development of the plume is reproduced and the transport phenomena are integrated into the 3D modeling. These phenomena are advection, dispersion, adsorption and degradation, but also recharge (combined with models of pollutant transport in unsaturated zone) or more complex phenomena such as for example the precipitation of metals

Assessment of the risks of leaching and migration as well as the effects of remediation techniques. More particularly, hydrogeological studies make it possible to answer the problems posed in the context of groundwater pollution and in particular they make it possible to evaluate the speeds and directions of migration, the possible impacts on receivers but also to simulate the effect of remediation on plume reduction