Factsheet: Groundwater flooding
What is groundwater flooding?
Groundwater flooding is caused by unusually high groundwater levels. It occurs as excess water emerges at the ground surface or within underground structures such as basements. Groundwater flooding tends to be more persistent than surface water flooding, in some cases lasting for weeks or months, and it can result in significant damage to property.
The risk of damage caused by groundwater flooding can be considered less if the property does not have a basement. However, it can not be discarded completely as it could still negatively impact the property.
It is important to note that groundwater is often excluded from the flood element of house insurance, and we recommend reviewing any policies you may have.
What is the data based on?
Groundwater flood data is provided by Ambiental Risk Analytics. The Groundwater flood risk of the report is a result of a combination of the local geology and topography features present for which groundwater flooding could potentially occur.
This data is based on a 5m Digital Terrain Model (DTM) and 1 in 100 year return period.
Further guidance on groundwater flooding is available from the Environment Agency.