What causes groundwater flooding in southern England?

Groundwater flooding occurs when the underground water table rises to ground level, causing water to seep to the surface and potentially into buildings through floors and basements.

How long does groundwater flooding typically last?

Unlike river flooding, groundwater flooding can persist for many months after the initial rise in water levels, posing a prolonged challenge.

Which areas in England are most affected by groundwater flooding?

Areas with chalk or sand and gravel bedrock, such as Dorset, river valleys, and urban areas like Oxford, are particularly prone to groundwater flooding.

Home / Environment / England's South Drowning in Groundwater Flood Danger

England's South Drowning in Groundwater Flood Danger

5 Feb

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Summary

Groundwater flooding is causing historic highs in parts of Dorset.
Rising groundwater levels can seep through floors and basements.
Groundwater floods can take many months to disperse after occurring.

England's South Drowning in Groundwater Flood Danger

Heavy rainfall is exacerbating groundwater flooding concerns across the south of England, with Dorset Council reporting "historical highs" in affected areas. Flood-prone regions in Oxfordshire, Berkshire, and Hampshire are also experiencing significant impacts. The Met Office has issued a yellow rain warning for parts of the South East and South West.

Groundwater flooding occurs when the underground water table rises and breaches the surface, potentially seeping into homes through floors, cellars, and basements. This phenomenon is particularly common in areas with chalk or sand and gravel bedrock, such as river valleys and specific regions like Dorset.

Unlike river flooding, groundwater inundation can persist for many months, posing a prolonged challenge. In 2024, tankers were deployed in Berkshire to pump out groundwater. The Environment Agency advises that communities should prepare, as these high water levels can lead to overflowing sewers and damage properties.