The borehole monitors groundwater level in the Permo–Triassic sandstones of South West England.
Our enquiries service can help you to access groundwater level data for this well.
Hydrograph
Bussels No 7A hydrograph, 1971 to 2012. BGS © UKRI.
Information about the well
Hydrogeological setting
| Bussels No 7A | |
|---|---|
| Wellmaster ID | SX99/37B |
| NGR | 2952 0987 |
| Datum | 26.97 m AOD |
| Monitoring details | |
| Type | Groundwater Level |
| Aquifer | Permo–Triassic Sandstone |
| Confinement | Unconfined |
| Depth | 91.44 m |
| Record | |
| Monitored by | EA South West |
| Records commence | 1971 |
| Records end | Active |
The borehole monitors groundwater level in the Permo–Triassic sandstones of South West England.
It is drilled into the Exeter Group, Dawlish Sandstone Formation, overlain by a thin layer of River Terrace Deposits.
Water levels in the borehole stand within the cased section and just below the terrace deposits, but the aquifer appears to be unconfined.
Well or borehole construction
The borehole was drilled as an observation well.
It was drilled at a diameter of 311 mm from surface to 18.44 metres with 203 mm diameter casing inserted. The remainder of the borehole was drilled at 146 mm diameter then opened up to 194 mm diameter.
Hydrograph response
Map of Bussells No 7A showing geology. BGS © UKRI.
The hydrograph has an annual sinusoidal appearance, with a subdued reaction to individual rainfall events in both summer and winter, suggesting some rapid recharge occurs. This is borne out by reports of rapid recovery in response to heavy rainfall observed during the bore’s post-construction pump test.
Annual fluctuations are normally between 1 and 2 metres.
There is some evidence of a superimposed long period response, with gentle rises and falls over several years that may be influenced by rainfall variation over similar periods.
Data issues
Datum changed from 26.97 m AOD in 20/01/2000.
References
Bloomfield, J P, Gaus, I, and Wade, S D. 2003. A method for investigating the potential impacts of climate-change scenarios on annual minimum groundwater levels. Water and Environment Journal, 17 (2), 86-91.
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
Contact enquiries for further information.