Geotechnical study in Vilanova de Arousa

In Vilanova de Arousa, sandstones, conglomerates and flysch predominate, which constitute the most usual geological substratum, followed by the occasional presence of fine sands and silts. These materials generally display good to moderate bearing capacity, which favours the viability of conventional shallow foundations, although the presence of silts may require additional checking of compactness and possible differential settlements. The low permeability characteristic of these formations limits natural drainage, an aspect to take into account when planning foundations in order to prevent accumulations and pressures from groundwater.

Seismic activity in this municipality is practically nil, with only a single recorded event over 30 years and a maximum magnitude of 1.5, which classifies seismicity as very low. No presence of karst is identified, nor risks associated with expansive clayey ground, as the substratum does not contain clays. In summary, the main factor conditioning geotechnical studies in Vilanova de Arousa lies in verifying the compactness of the silts and in managing drainage in foundations on low-permeability materials.