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Hydrogeological Section, Department of Geological Sciences, University of Birmingham, , P.O. Box 363, Birmingham, B15 2TT;
* Essex River Division, Anglian Water Authority, , 129 Springfield Road, Chelmsford, Essex CM2 6JN;
Lincolnshire River Division, Anglian Water Authority, (formerly Essex River Division), , 50 Wide Bargate, Boston, Lincolnshire PE21 6SA.
The hydrochemistry of groundwaters in the Chalk and glacial drift deposits are detailed to show the distribution of different hydrochemical types in relation to recharge. Corrected radiocarbon ages of 25 groundwater samples indicate that old groundwaters ranging in age up to 30 000 years exist beneath the boulder clay in the interfluve areas. Recharge and flow into the Chalk aquifer are shown to occur predominantly in the valley areas and to be controlled by the distribution of drift deposits. The role of sands and gravels below the boulder clay in promoting horizontal groundwater flow is demonstrated.
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