Quantifying diffuse pollution sources and loads for environmental quality standards in urban catchments.

Ellis, John Bryan and Revitt, D. Mike (2008) Quantifying diffuse pollution sources and loads for environmental quality standards in urban catchments. Water Air and Soil Pollution:Focus, 8 . pp. 577-585. ISSN 1567-7230 [Article] (doi:10.1007/s11267-008-9175-9)

Abstract

The paper explores the application of a unit area loading (UAL) approach to address the requirements of the US Clean Water Act (CWA) and the EU Water Framework Directive (WFD) for the identification and quantification of diffuse urban pollution sources. The UAL approach defines the spatial
distribution of pollutant loadings within an urban catchment as a basis for the assessment of in-stream hazards and the implementation of source control BMP measures. Calculated annual outflow concentrations for a specific catchment for two pollutants, zinc and hydrocarbons, illustrate the different levels of dilution/control, which can be required to achieve receiving water quality standards and objectives. Methodological issues relating to traditional volume-concentration probabilistic modelling on which the
UAL approach is based are discussed, and the application of the UAL approach to non-point diffuse pollution load management is reviewed.

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