Location of Wetwang borehole

The Wetwang borehole was drilled into the Chalk of Yorkshire. The water levels in this well usually fluctuate by about 10 metres over the course of a year, but these fluctuations have exceeded 15 metres at times.

Our enquiries service can help you to access groundwater level data for this well.


Our groundwater level records for Wetwang start in 1971.


Show data from :-
1971 to 2015 1970s 1980s 1990s 2000s 2010s

Information about the well

Wellmaster ID SE95/6
NGR 4957 4593
Datum 42.28 m AOD
Monitoring details
Type Groundwater Level
Aquifer Chalk
Confinement Unconfined
Depth 45.72 m
Monitored by EA North East
Records commence 1971
Records end Active

Hydrogeological setting

This borehole measures water level in the Yorkshire Chalk.

Geological map of the area around the Wetwang borehole (click for key)

It is drilled into the Flamborough Chalk Formation, which is overlain by 4.1 metres of head deposits. The borehole log identifies Upper and Middle Chalk, without putting a depth on the boundary between them.

The aquifer is unconfined.

Well or borehole construction

The well consists of a 152 mm diameter borehole, reducing to 101 mm and 37.49 m deep. The borehole was originally drilled to 45.72 m but caved in. It is lined to 7.6 metres.

Hydrograph response

The hydrograph has an annual sinusoidal pattern, with some response to winter rainfall episodes.

Annual fluctuations are typically 10 metres, with peak fluctuations > 15 metres. The borehole recesses to a base level of just below 20 m AOD in most years. This is well above the borehole bottom, suggesting the presence of a geological control on level.


Topographic map with hillshade of the area around the Wetwang borehole


Contact Andrew McKenzie for further information