Bussels No 7A

The borehole monitors groundwater level in the Permo–Triassic sandstones of South West England.

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Hydrograph


Hydrograph

Show data from :-
1971 to 2013 1970s 1980s 1990s 2000s 2010s


Information about the well

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

Map of Bussells No. 7A showing geology

Hydrogeological setting

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

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.

Contact

Contact Andrew McKenzie for further information