Abstract
The Coventry Groundwater Investigation has researched the sources and movement of chlorinated hydrocarbon solvents in the groundwater system underlying the Coventry region. The hydrogeological scene is set in this paper as a basis for the other aspects of the investigation which are reported in the other papers in this volume. The deep, intercalcated sandstones and mudstones of the Permo-Carboniferous which underly the study area, behave as a multilayer aquifer, although individual aquifer units are not regionally extensive. The sandstone units are fractured and behave as dual porosity aquifers, with rapid tracer movement in fractures and diffusion into the low-permeability but porous matrix. The water balance of the groundwater system has changed from natural conditions because of man's influence. Although direct recharge has been reduced by the impermeable surfaces of roads and towns, substantial extra recharge arises in the urban areas from leaking water mains.
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