Abstract
The formation of a model to represent surface and subsurface flows of water for a catchment in central England is described. A finite-difference model is used to represent groundwater flows in an aquifer with surface water flows being represented by flow balance techniques. Three hydrologically significant land types are identified and the model contains three components which correspond to these. The purpose of the model is to assess the long-term water resources of the catchment. River flows are calculated for over 120 locations within the catchment. The results show that it is possible to formulate a comprehensive model, of a complete catchment, based upon measurable, physical parameters with the inflow of water being calculated solely from rainfall and evapotranspiration estimates.
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