Water Framework Directive intercalibration manual : procedure to fit new or updated classification methods to the results of a completed intercalibration

The European Water Framework Directive (WFD) requires the national classifications of good ecological status to be harmonised through an intercalibration exercise. Most of the Geographical Intercalibration groups have finalized Intercalibration results but many Member States have not joined the group or have not intercalibrated the methods due to some reasons. Those Member States will have to show that their methods are compliant with the WFD normative definitions and that their class boundaries are in line with the results of the intercalibration exercise. This document provides a workflow to fit new or revised national classification methods to the harmonised definition of good ecological status established in the completed intercalibration exercise.