World Hydrological Cycle Observing System (WHYCOS)

Système mondial d'observation du cycle de l'eau

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Established when launched; becoming operational in stages. Implemented by B-XB3556 - World Meteorological Organization (WMO), modelled on F-XF9998 - World Weather Watch (WWW).


Work towards better understanding of the global hydrological cycle and its variability, and an improved knowledge of the status and trends of the world's freshwater resources; establish a global network of national hydrological observatories that provide information of consistent quality, transmitted in real or near real time to national, regional and global databases; strengthen the technical and institutional capacities of hydrological services to collect and disseminate hydro-meteorological data and information through the development of appropriate national water resources information systems, thereby facilitating their use for sustainable socio-economic development; facilitate regional and international cooperation and promote data sharing at the regional and global levels for scientific research in climate change and its impact on water-related issues; promote the use of information technology and space-based observations as a complementary mode of providing information on water-related issues by improving national and regional capacities; enhance cooperation among countries and hydrological services sharing regional water bodies by supporting and improving the availability, accuracy and dissemination of hydrological data and information.


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WHYCOS International Advisory Group (WIAG) ensures worldwide operational linkage among HYCOS components.


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Relations with Inter-Governmental Organizations

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Type I Classification

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Type II Classification

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Subjects *

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UN Sustainable Development Goals **

GOAL 6: Clean Water and Sanitation



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* Subject classification is derived from the organization names and aims.
** UN SDGs are linked to the subject classification.

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