Tag Archives: chalk

Why are Chalk Valleys Most Prone to Groundwater Flooding?

As I write this, communities in Dorset, Hampshire, Berkshire, Wiltshire, Surrey and West Sussex are suffering from groundwater flooding. Exceptional winter rainfall has caused the water table to rise above the ground surface, so that groundwater is emerging in springs, stream beds and sewers across the South of England. All of the villages in the news that I’ve seen, with groundwater flooding are on, or just downstream of, the Chalk aquifer (Chalk outcrop is pale green in the image below). Why the Chalk in particular?

Chalk groundwater flooding

Some locations with groundwater flooding, January 2014

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