Intercalibration: problems of selecting types WFD Annex V, 1.4.1: “The (intercalibration) network shall consist of sites selected from a range of surface water body types present within each ecoregion”
Intercalibration: problems of selecting types Important issues: which typology system to use for intercalibration? how many and which types to include heavily modified water bodies
Which typology system to use for intercalibration? Typologies are not yet defined Different Member States will use different typologies What typology should be used as a basis for intercalibration
Typology requirements for intercalibration….
Typology requirements for reference conditions are different!
How many types for intercalibration? Impossible to include all types in intercalibration network Focus on a few types: keeps intercalibration exercise manageable allows to select more intercalibration sites for each type, allowing better comparison
How many types for intercalibration? Sufficient types should be included to cover: all ecoregions all Member States
Selection criteria for intercalibration types Representative for many ecoregions Existence of potential intercalibration sites quantifiable reference conditions availability of sites at high/good and good/moderate boundary data availability
Artificial and Heavily modified water bodies Still unclear if and how to include HMWB in intercalibration Need for agreement between WG’s HMWB and Intercalibration Proposal: preparation of common paper
Artificial and Heavily modified water bodies WFD seems to require that HMWB are also intercalibrated Maximum ecological potential instead of reference conditions Some countries plan do designate most of their water bodies as HMWB - should be included in intercalibration
Artificial and Heavily modified water bodies Problem: provisional HMWB designation only in 2004 ‘failure to achieve good ecological status’ is one of the criteria this requires intercalibrated assessment methodologies “Maximum ecological potential” needs to be further defined