BGS Groundwater Flooding

Groundwater flooding is the emergence of groundwater at the ground surface. It can occur in a variety of geological settings including valleys in areas underlain by Chalk, and in river valleys with thick deposits of alluvium and river gravels. Groundwater flooding happens in response to a combination of already high groundwater levels (usually during mid- or late-winter) and intense or unusually lengthy storm events. Groundwater flooding often lasts much longer than flooding caused by a river over-flowing its banks. It may last many months and can cause significant social and economic disruption to the affected areas.

Data is available in Shapefile or Tab file format. Groundwater flood risk types are shown as polygons and attributed as either "superficial deposits flooding" or "clearwater flooding", and are graded into 5 categories from Very Low to Very High.

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