Geotechnical study in Tomiño

In Tomiño, the subsurface is dominated by sandstones, conglomerates and flysch, followed at a distance by slates and schists. This type of substrate, characterised by its compactness and low deformability, usually provides good bearing capacities for construction, favouring the use of shallow foundations when local conditions allow. The formations present generally show low permeability, although there may be shallow groundwater levels, which advises a detailed study of the water table level to avoid dampness problems in basements or foundations.

Seismic activity in the municipality is very low, with a maximum of five events over thirty years and a maximum magnitude that is of little significance (Mmax 2.4), so seismic risk does not represent a relevant constraint in structural design. Since the substrate is not clayey, the risk of expansivity can be ruled out, which simplifies the choice of foundation type. With no karst features and no problems associated with collapsible soils or dissolution, the main factors to consider in the geotechnical study will be the spot assessment of the quality of the substrate and the control of the local water table level.