Old Basing Tertiaries Operational Catchment
Water bodies
There are 1 water bodies in this operational catchment.
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About
The ‘Old Basing Tertiaries’ groundwater body (GWB) refers to groundwater residing in the sands and sandstones of the Lambeth Group between Farnham in the east and Ramsdell, north-west of Basingstoke, in the north-west. The Lambeth Group, formerly known as the Woolwich and Reading Beds, comprises about 30m of mainly clay strata but also includes sandstones classified as Secondary aquifers. Its stratigraphic position in NE Hampshire is between the Upper Cretaceous Chalk and the London Clay. The NW - SE strike of the strata, as they dip into the western end of the London Basin, forms a ribbon-like outcrop of about 400m width. The GWB is soon confined beneath the London Clay to the north, along with the ‘Basingstoke Chalk’ GWB, with which it could easily be joined. To the east of the arbitrary boundary to the north of Runfold, near Farnham, the GWB becomes the ‘Effingham Tertiaries’ GWB.
