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Shallow thinking

Letters

Water companies report that 80% of the source is from groundwater - we were shown on TV six weeks ago that the water levels are now tens of meters down the extraction shafts.

Yet we also see that the Docklands Light Railway's DLR Lovat tunnel boring machine, now positioned in its shallow start pit, is about to experience water pressures of between 1 and 3.5 bar (NCE 11 May).

Should the extraction boreholes be in London where the population is?

John Franklin (F ret), 11 The Ridings, East Horlsey, Leatherhead, Surrey KT24 5BN

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