N_ZONE_ALEA_PPRN_20140309_S_032

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Dataset information

Country of origin
Updated
2020.09.29 00:00
Created
2020.10.12
Available languages
French
Keywords
aléa, cartographie, retrait-gonflement, nom de la commune, argile, données ouvertes
Quality scoring
90

Dataset description

The mapping of the hay removal of clays in the commune of Saint-Justin in the Gers department is extracted from the departmental mapping from the BRGM. This mapping is a zoning of the probability of occurrence of the phenomenon of shrink-inflating of clay soils. A susceptibility map was first drawn up on the basis of purely physical criteria by the BRGM from the geological maps of the department, which were interpreted taking into account the following factors for each geological formation: — the proportion of clay material within the formation (lithic analysis); — the proportion of blowing minerals in the clay phase (mineralogical composition); — the geotechnical behavior of the material. For each of the clay formations identified, the hazard level is ultimately the result of the level of susceptibility thus obtained with the density of sinister swelling, reported to 100 km² of actual urbanised outcropping surface.
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