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Updated: Jun 2, 2026

Watershed Planning within a Quantitative Scenario Analysis Framework
Published on: July 24, 2016
A model-based prioritisation exercise for the European water framework directive.
Klaus Daginnus1, Stefania Gottardo, Ana Payá-Pérez
1Institute for Health and Consumer Protection, Joint Research Centre, European Commission, Via E. Fermi 2749, 21027 Ispra, VA, Italy. Klaus.Daginnus@bsu.hamburg.de
A new model prioritizes chemicals under the Water Framework Directive (WFD), assessing hazards and exposure for aquatic life and human health. This risk assessment identifies 78 high-concern substances for improved environmental protection.
Area of Science:
- Environmental Chemistry
- Ecotoxicology
- Water Quality Management
Background:
- The Water Framework Directive (WFD) requires prioritization of chemical substances to protect aquatic ecosystems.
- Existing assessments need robust methods to evaluate a wide range of chemicals based on hazard and exposure.
Purpose of the Study:
- To develop and apply a model-based approach for prioritizing chemicals relevant to WFD implementation.
- To identify substances of high concern for aquatic and human health, considering bioaccumulation and secondary poisoning.
Main Methods:
- Evaluated 2,034 substances using hazard and exposure criteria.
- Ranked 78 "high concern" substances by risk ratio (PEC/PNEC).
- Complemented model-based prioritization with monitoring data.
Main Results:
- Identified 78 substances as "of high concern" based on integrated hazard and exposure assessment.
- Established a risk-based ranking for these substances.
- Demonstrated the feasibility of a combined model and monitoring approach.
Conclusions:
- The model-based prioritization is a crucial first step for WFD implementation.
- The approach provides a foundation for a flexible screening tool for future WFD exercises.
- Integrated assessment of ecotoxicological and human health risks is essential for effective chemical management.
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