Argiles RGA (zonage exposition)
Clay shrinkage-swelling hazard zoning (RGA)
Géorisques · Environnement — French national public dataset.
This national dataset, published via the Géorisques platform run by French public authorities, maps the exposure of French territory to clay shrinkage-swelling risk (retrait-gonflement des argiles, RGA), a geological phenomenon linked to soil moisture variation that can damage building foundations. It provides zoning information indicating the level of hazard across municipalities, based on geotechnical mapping. The data is intended to support risk assessment for construction, land-use planning, and property transactions, and forms part of the broader Géorisques environmental and natural-hazard data offering covering France.
environnement
French Government