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Data Access and Exchange

In May 1999, the Thirteenth WMO Congress adopted Resolution 25 (Cg-XIII) - Exchange of Hydrological Data and Products.

This committed WMO to broaden and enhance the free and unrestricted international exchange of hydrological data, in accordance with the needs of the global hydrological community and requirements of WMO's scientific and technical programmes.

Exchange of data at the regional level is being enhanced through the World Hydrological Cycle Observing System (WHYCOS) Programme, and at the global level WMO has established a series of data centres:

  • The Global Runoff Data Centre (GRDC), located in the Federal Institute of Hydrology in Koblenz, Germany
  • The Global Precipitation Climatology Centre (GPCC), located in the German Meteorological Service, Germany
  • The International Groundwater resources Assessment Centre (IGRAC), located in the UNESCO Groundwater Centre, The Netherlands
  • The International data centre on Hydrology of Lakes and Reservoirs, located in the State Hydrological Institute, Russia


To learn more about the various aspects of data access and exchange:




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