The Yew Tree Farm borehole is used to monitor groundwater levels in the Permo–Triassic sandstones of Lancashire.
BGS Enquiries can help you to access groundwater level data for this well.
Hydrograph
Yew tree farm hydrograph, 1969 to 2020. © UKCEH.
Information about the well
Hydrogeological setting
| Yew Tree Farm | |
|---|---|
| Wellmaster ID | SD41/32 |
| NGR | 3440 4116 |
| Datum | 23.69 m AOD |
| Monitoring details | |
| Type | Groundwater level |
| Aquifer | Permo–Triassic sandstone |
| Confinement | Confined |
| Depth | 58 m |
| Record | |
| Monitored by | EA North West |
| Records commence | 1973 |
| Records end | Active |
The borehole measures groundwater levels in the Permo–Triassic sandstones of Lancashire. The borehole penetrates the Helsby Sandstone Formation, overlain by 18 m of till deposits. The till acts as a confining layer and observed levels tend to stand within the till.
Well or borehole construction
203 mm diameter borehole reducing to 150 mm diameter at depth.
Hydrograph response
The hydrograph has an annual sinusoidal pattern, with short-term responses to annual recharge events. These have been superimposed since the early 1990s on a rising trend. Prior to the 1990s, levels were stable.
Annual fluctuations are generally less than 0.5 m, although occasional variations of 1 m have been observed.
Reference
Finch, J, Marsh, T, and McKenzie, A A. 2007. A preliminary risk assessment of the potential for groundwater flooding during the winter of 2007/8 — an update. (Wallingford, UK: NERC/Centre for Ecology and Hydrology-British Geological Survey.)
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 the data they collect and curate, which includes many monitoring sites beyond those highlighted on these pages:
Contact
Please contact BGS Enquiries for further information.