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Groundwater conceptual models: implications for evaluating diffuse pollution mitigation measures

Allen, D.J.; Darling, W.G.; Davies, J.; Newell, A.J.; Gooddy, D.C.; Collins, A.L.. 2014 Groundwater conceptual models: implications for evaluating diffuse pollution mitigation measures. Quarterly Journal of Engineering Geology and Hydrogeology, 47 (1). 65-80. 10.1144/qjegh2013-043

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Abstract/Summary

The Water Framework Directive (WFD) identifies diffuse pollution as a long-term threat to water quality. Farming contributes significantly to this pollution. There is a clear need for mitigation measures and assessment of their efficacy. Accordingly, Demonstration Test Catchments (DTCs) have been established in England to test the effectiveness of changes in agricultural practice on river water quality and ecology. However, the presence of groundwater in these hydrological systems implies a wide range of travel times for pollutants from source to receptor. Unless flow routes are better characterised, it will be difficult to gauge the success of control measures in the short-term. Using 3D modelling and supplementary hydrochemical information, this study considers the hydrogeology of several sub-catchments in the Avon DTC, southern England. Data suggest that groundwater ages >25 years exist in parts of the catchments; clearly observations like these must be used to judge the likely effectiveness of targeted control measures. The revealed hydrogeological complexity of the Avon catchment is unlikely to be unique, so the techniques described here should be applicable to other lowland river systems with moderate-to-high baseflow indices (>0.5). To support the WFD, groundwater conceptual models should inform the design of effective measures for diffuse pollution mitigation.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1144/qjegh2013-043
ISSN: 0481-2085
Additional Keywords: GroundwaterBGS, Groundwater,Diffuse pollution, conceptual, models, mitigation
NORA Subject Terms: Hydrology
Date made live: 06 Mar 2014 16:25 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/505040

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