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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