Didmarton 1

This well is used to monitor water levels in the confined Inferior Oolite aquifer to the west of Malmesbury, Gloucestershire.

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Hydrograph

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Information about the well

Didmarton 1
Wellmaster ID	ST88/62A
NGR	3827 1874
Datum	113.8 m AOD
Monitoring details
Type	Groundwater Level
Aquifer	Inferior Oolite Group
Confinement	Confined
Depth	112.1 m
Record
Monitored by	EA South East
Records commence	1977
Records end	Active

Hydrogeological setting

The borehole is located near the outcrop of the junction of the Forest Marble and Chalfield Oolite formations, both part of the overlying 'Great Oolite' aquifer. Beneath this the borehole penetrates the Fuller's Earth Formation, the Inferior Oolite Group and about 5.5 m of the Bridport Sand Formation.

The Inferior Oolite aquifer is confined by clays within the Fuller's Earth Formation. The underlying Bridport Sand Formation has a high storage coefficient and is generally in hydraulic continuity with the Inferior Oolite Group limestones.

Well or borehole construction

The borehole has a diameter of 101 mm to 85 m depth, below which it narrows to 86 mm. It has 51 mm casing to 80 m depth.

Hydrograph response

The hydrograph shows a smooth sinusoidal pattern. The water level exhibits large seasonal fluctuations but always remains above the base of the confining beds. The maximum water level appears to be constrained.

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).