1. Experimental research basins in Italy -  an inventory (by Luca Brocca)
2. Hydrologic research in small basins in Belgium (by V. Pauwels)
3. Status and perspectives of hydrological research in small basins in Europe (2018; Hubert Holzman) DOI: https://doi.org/10.18172/cig.3406
   
4. The hydrological research catchments of Slovak Republic and Czech Republic (2006; Ladislav Holko)

• ERB-Germany: German FRIEND-Water/ERB Working Group  The “FRIEND-Water/ERB“ working group deals with small hydrological research areas in Germany.

    The website includes the Braunschwaig Declaration: The need for a global network of long-term small hydrological research basins (4 pages, Koblenz 2010).

• EURO FRIEND-Water

The FRIEND-Water program is a flagship initiative within the Hydrological Intergovernmental Program (IHP) from UNESCO. FRIEND stands for “Flow Regimes from International and Experimental Network Data”.

• LTER-Europe

The LTER-Europe (Long-Term Ecosystem Research in Europe) seeks to better integrate traditional natural sciences and holistic ecosystem research approaches that include studies of the human component. The LTER-Europe is the networking component of the European LTER and consists of 26 national LTER networks (as of April 2025).