A view of water quality from the Plynlimon watershed C. Neal Institute of Hydrology, Maclean Building, Crowmarsh Gifford, Wallingford, UK.
Abstract. A summary of hydrochemical research in the Plynlimon
catchments from 1983 to the present is related to identifying water flow pathways within catchments and the
modelling of soil and stream water acidification. The study reveals a highly heterogeneous
system that barely conforms with current understanding of hydrology and acidification
theory. The role of hydrochemical mixing processes and groundwater flow routing is emphasised
as is the need for maintaining long term monitoring studies and enhancing process based
studies of water and chemical fluxes through catchments. The applicability of current environmental
impact models for predictive and environmental management purposes is questioned
and it is proposed that new hydrochemical modelling structures are needed to examine the highly
heterogeneous systems being modelled.
Citation: Neal, C.: A view of water quality from the Plynlimon watershed, Hydrol. Earth Syst. Sci., 1, 743-753, doi:10.5194/hess-1-743-1997, 1997.