DROPSTONE consultancy proposed to the Services Industriels de Genève an exploratory application of the 3D ERT-IP geophysical method (Electrical Resistivity Tomography and Induced Polarization) to improve the identification and characterization of Quaternary aquifers. Originally developed and widely used in the mining industry to assess the geometry and quality of exploitable ore bodies, this technology enables detailed imaging of the subsurface in a fully non-invasive manner, without the need for additional drilling or excavation. The Loëx peninsula, located in the canton of Geneva, was selected as the study site. This area, predominantly agricultural and only lightly urbanized, offers particularly favorable conditions,

Since 2016, Dropstone has been a committed partner of the Industrial Services of Geneva (SIG) within the framework of the cantonal GEothermies.ch programme. Through sustained projects of hydrogeological investigations, we have contributed to the strategic assessment of geothermal potential and to a refined conceptual understanding of the principal aquifer systems across the canton. Our work has encompassed the major Rhône aquifers — Montbrillant, Charmilles, Saint-Jean, Lancy and Onex — as well as the transboundary aquifer systems of the Genevois and Puplinge sectors (Thônex, Eaux-Vives). We have also undertaken detailed investigations of the Montfleury aquifer (Bellevue, Petit-Saconnex), advancing the structural and