HOBE was via University of Copenhagen a formal member of the Consortium of Universities for the Advancement of Hydrologic Science (CUAHSI). This organization represents more than one hundred United States universities and receives support from the National Science Foundation (NSF) to develop infrastructure and services for the advancement of hydrologic science and education. CUAHSI is promoting the establishment hydrological observatories and critical zone observatories and issue recommendations for accurate and precise measurements of hydrological fluxes using recent advances in environmental sensors. HOBE received via this membership invitations to workshops and cyber seminars and was asked to present its research activities at the first Biennial Colloquium.
HOBE collaborated closely with the German ‘Terrestrial Environmental Observatory’ (TERENO). This is a joint program of several Helmholtz Research Centers: Forschungszentrum Jülich, Helmholtz Centre for Environmental Research–UFZ, Forschungszentrum Karlsruhe, Helmholtz Zentrum München–German Center for Environmental Health, and the German Research Centre for Geosciences–GFZ. Scientists from HOBE and TERENO visited each other on numerous occasions. There was also a mutual representation on the advisory boards. HOBE adopted TERENO’s webbased database interface.