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What is The Water table?

Put simply, it is the point beneath the surface of the ground at which natural ground water is found. It is one of the factors considered by mortgage lenders and a important factor in land drainage calculations and Building regulations / Planning permission. The level of the Water table rises and falls slightly during the seasons, normally being at its highest in Spring time.
 

How to find information about the depth of local water tables.

Finding and getting  information about  local water tables.

Getting information about the local water-table isn't easy. Water boards are useless, councils worse than useless, but the 
Environment Agency are helpful, they have boreholes throughout the U.K.  they monitor and if your garden or proposed building plot is near one of them they can supply data and because the water table does not vary widely over a small area, the data could be useful.
  
There isn't any water table depth data available on the Environment Agency website. If you require data for a specific area, send any request, including exactly what data you require and for where (full address) to enquiries@environment-agency.gov.uk 

Local Knowledge is probably your best bet, ask neighbours on all four sides, local building inspectors, local excavators and off course if you are purchasing a plot of soggy land ask your surveyor.
If it's only your garden seriously waterlogged while neighboring gardens are dry, the problem is not with the water table, but due to runoff from surface water and if a cluster of neighbouring gardens that have always been well drained suddenly become waterlogged, the problem again is unlikely to be with the water table. 
 
There are more and more reports of neighbourhoods in which the gardens had been dry for years suddenly developing surface water drainage problems, nothing to do with rising water tables, but most probably major excavation work nearby, diverting surface water.

This link to the Open university gives a lot more information about the Water Table.
http://openlearn.open.ac.uk/mod/oucontent/view.php?id=398860§ion=1.3 (copy and paste it into your search bar)

 

Your postcode   xxxx 2xx

Freely draining slightly acid but base-rich soils

  • Texture: Loamy
  • Coverage: England: 3.1%    Wales: 3.1%
  • Drainage: Freely draining
  • Fertility: High
  • Habitats: Base-rich pastures and deciduous woodlands
  • Landcover: Arable and grassland
  • Carbon: Low
  • Drains to: Groundwater