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.
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Location of Wetwang. BGS © UKRI.
Hydrograph
The groundwater level for Wetwang starts in 1971.
Wetwang hydrograph, 1971 to 2007. BGS © UKRI.
Information about the well
Hydrogeological setting
This borehole measures water level in the Yorkshire Chalk.
| Wetwang | |
|---|---|
| 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 |
| Record | |
| Monitored by | E A North East |
| Records commence | 1971 |
| Records end | Active |
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.
Geological map of the area around Wetwang. BGS © UKRI.
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.
Topography
Topographic map with hillshade of the area around the Wetwang borehole. BGS © UKRI.
Acknowledgements
At a national level, groundwater level monitoring data is collected and managed by the Environment Agency (England), the Scottish Environmental Protection Agency, Natural Resources Wales and the Department of the Environment (Northern Ireland). Access to the data they collect (which includes many monitoring sites beyond those highlighted on these pages) and curate is online in England (DEFRA) and Scotland (SEPA).
Contact
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