Management of point source discharges into rivers: Where do environmental quality standards in the new EC‐water framework directive apply?

Gerhard H. Jirka Professor, Institute for Hydromechanics, University of Karlsruhe, Kaiserstr. 12, Karlsruhe, 76128, Germany Phone: +49–721–608–2200 Fax: +49–721–608–2200 E-mail: [email protected] http://www.ifh.uni‐karlsruhe.de

Tobias Bleninger Scientific Assistant, Institute for Hydromechanics, University of Karlsruhe, Kaiserstr. 12, Karlsruhe, 76128, Germany Phone: +49–721–608–2200 Fax: +49–721–608–2200 E-mail: [email protected] http://www.ifh.uni‐karlsruhe.de

Richard Burrows Professor, Department of Civil Engineering, University of Liverpool, Brownlow Street, Liverpool, L69 3GQ, Great Britain Phone: +44–151–794–5233 Fax: +44–151–794–5233 E-mail: [email protected]

Torben Larsen Professor, Department of Civil Engineering, Aalborg University, Denmark, Sohngaardsholmsvej 57, Aalborg, 9000, Denmark Phone: +45–9635–8480 Fax: +45–9635–8480 E-mail: [email protected]

Abstract

The “combined approach” in the new EC‐Water Framework Directive (WFD) consisting of environmental quality standards in addition to emission limit values promises improvements in the quality characteristics of surface waters. However, the specification of where in the water body the environmental quality standards apply is missing in the WFD. This omission will limit its administrative implementation. A clear mixing zone regulation is needed so that the quality objectives of the WFD are not jeopardized. This need is demonstrated using the examples of point source discharges into rivers. Furthermore, water authorities will have to make increased use of predictive modeling techniques for the implementation of the “combined approach”.

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Management of point source discharges into rivers: Where do environmental quality standards in the new EC‐water framework directive apply?

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Management of point source discharges into rivers: Where do environmental quality standards in the new EC‐water framework directive apply?

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