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There is nothing so practical as a good theory" Bertrand Russell The paper recapitulates the theory of catchment water delicits and the use of density analysis previously published in this journiil. Thereafter theory and method are applied to the Thames River Basin in England where it is shown that the catchment is marginally in deficit but that future developments in population growth, output growth and climate change requite Ihe application of specific redemptive options if a serious deficit situation is to be avoided. In particular, strict house-building controls are called for as well as the universal metering of domestic water use.

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