1. 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”

2. 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

3. 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

4. Typology requirements for intercalibration….

5. Typology requirements for reference conditions are different!

6. 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

7. How many types for intercalibration?
Sufficient types should be included to cover:
all ecoregions
all Member States

8. 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

9. 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

10. 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

11. 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