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Typology

The background documents accompanying the RBMPs should include a detailed description of the typology methodology, with information on whether system A or B has been used, typology factors (descriptors) and related ranges, methods for testing typology versus biological data, and setting the type-specific reference conditions.
Member States with a coastline where no transitional waters have been delineated should include a clear justification for this in these documents.
For international RBDs, it should be indicated whether typology was co-ordinated with the Member States and third countries sharing the international RBD and, if so, how this co-ordination was achieved and the results. If the typology was not co-ordinated, provide reasons why, steps that have been taken to address this shortcoming and by when co-ordination will be achieved.
Small water bodies

Describe the approach that has been taken to deal with small water bodies including information on the size threshold used for the delineation of water bodies for rivers, lakes and transitional waters.
Reference conditions

Describe the reference conditions for all types and quality elements (biological, physico-chemical and hydromorphological). If there are gaps, identify them explicitly. Identify any quality elements which are not considered reliable for some types (under WFD Annex II section 1.3.vi) and explain the basis of information.
Designation of HMWBs

Describe in detail the methodology for the designation of HMWBs, including:
Criteria used for the identification of substantial change in character. Thresholds should be included if they have been used (such as percentage, length or area of the water body affected by modification, the size of dams or impoundment).
Type of physical alterations considered for the designation of HMWB.
Criteria used for the assessment of significant adverse effect on the use. Indicate if thresholds have been used for the different water uses to define significant adverse effect (such as percentage of losses in energy production, agricultural production, and increase in risk of flooding).
List the water uses behind the designated HMWB and the number or percentage of water bodies for each use.
Explain how WFD Article 4(3)b has been applied (better environmental option). Which ‘other means’ have been considered for each water use. Describe all cases in which this assessment has concluded that there is a need to restore a water body and achieve the beneficial objectives through other means which are significantly better environmental options.
For further information, refer to the following CIS Guidance Documents:

CIS Guidance Document No. 2: Identification of Water Bodies[1]
CIS Guidance Document No. 4: Identification and Designation of Heavily Modified and Artificial Water Bodies[2]
CIS Guidance Document No. 5: Transitional and Coastal Waters – Typology, Reference Conditions and Classification Systems[3]
CIS Guidance Document No. 10: Rivers and Lakes - Typology, Reference Conditions and Classification Systems[4].
In addition, refer to the Intercalibration Official Decision[5] and Technical Reports[6].