Policy paper: Thames: groundwater situation

Environment Agency

January 21
14:51 2021


This document provides information on the groundwater situation for:

  • West Berkshire
  • Wiltshire
  • Surrey
  • Windsor
  • Maidenhead
  • north east Hampshire
  • Buckinghamshire
  • Vale of White Horse

Flooding from groundwater can happen when the level of water within the rock or soil that makes up the land surface (known as the water table) rises. The level of the water table changes with the seasons due to variations in long term rainfall and water abstraction. When the water table rises and reaches ground level, water starts to emerge on the surface and flooding can happen.

Lead local flood authorities (the unitary or County Council) are responsible for managing the risk of flooding from groundwater. They set out how they plan to do this in their local flood risk management strategies.

The Environment Agency has a strategic overview for all sources of flooding including groundwater. This means they will provide support to other risk management authorities. They supply information in the form of monitored groundwater levels. In some areas that have historically experienced groundwater flooding, the Environment Agency provide a groundwater alert or warning service.

Published 28 March 2014
Last updated 21 January 2021 +show all updates
  1. Updated with briefing note 18 January 2021.

  2. Weekly update for 11 Januray 2021

  3. Update 6 January 2021 with latest briefing.

  4. Briefing note updated on 30 December 2020.

  5. New groundwater briefing note added.

  6. Update 01 June added - all alerts removed.

  7. Added 26 May 2020 update.

  8. 18 May update added.

  9. Updated 11 May 2020.

  10. Page updated with the latest briefing. In the Wycombe area including Radnage and the lower Hughenden Valley, the groundwater flood alert will be removed on Monday 4 May 2020.

  11. Updated with latest briefing 6 April 2020.

  12. Updated with briefing 30 March 2020

  13. Updated with latest briefing 23 March 2020.

  14. Briefing note added for 16 March 2020

  15. Briefing added for 10 March 2020

  16. Updated with briefing dated 2 March 2020.

  17. Updated with briefing dated 24 February 2020.

  18. Updated with latest briefing, 17 February 2020

  19. Updated with latest briefing 10 February 2020

  20. 03 February 2020 update

  21. Updated with latest situation and forecast 28 January 2020.

  22. Updated 21 January 2020 with current situation and forecast.

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