- 3.2.2.3. Reference conditions of rivers in the Tisza River Basin

The Danube River Basin countries agreed on general criteria as a common base for the definition of reference conditions. These criteria are presented and have then been further developed by the countries of the Tisza River Basin on the national level into type-specific reference conditions. The definition of reference conditions was based on the following approaches.

• spatially based approach using data from monitoring sites,
• approach based on predictive modelling,
• definition of temporally based reference conditions using either historical data or palaeoreconstruction, or
• use of expert judgement (where none of the above methods were possible). (4.2.2.4. Reference conditions - p.42)