British Geological Survey (BGS) Geo Sure has published three dimensional clay shrinkage and swelling maps for the London and the Thames Valley.
According to the BGS, the regional hazard susceptibility map identifies areas of potential shrink–swell hazard, in three dimensional space, at intervals down to 20m with the data classified on an A–E range of hazard susceptibility.
“The shrink-swell properties of the London Clay affect developers, construction companies, and local government due to increased costs of insurance, additional engineering works to stabilise land, or potential relocation of developments,” said BGS engineering geologist Lee Jones. “Information on the 3D distribution of shrink-swell properties permits identification of potential problems at the surface, in the shallow sub-surface, or deeper underground.”
The BGS has said that the data contained in the news maps has been produced by geologists, geotechnical specialists and information developers at the BGS, and are derived from the London geological model.