Solutions of many hydrological issues are based on knowledge gained in small research basins (Braunschweig Declaration).

While some hydrological and ecologically related problems have become urgent only recently, others have been permanently under the observation of the hydrological community. Changes affecting the hydrological cycle, resulting from environmental changes caused by climatic fluctuations and human activities, represent issues of increasing importance. Hydrological modelling, forecasting and computation of hydrological characteristics in ungauged basins are of permanent relevance. Even if they are of highest interest, the interactions of surface and ground waters remain rather poorly known to date. All of these issues will be discussed during the conference. More specifically, the sessions will cover the following topics:

• Uncertainties in surface and ground water interactions. 
• Сhanges in hydrological regimes resulting from climate variations and human impacts. 
• Current state, problems and perspe­ctives of hydrological modelling. 
• Study of runoff formation in research basins and the transfer of results to ungauged basins. 
• New methods for water balance components measurements. 
• Open session on hydrological and ecologically related research in small basins.