The National Hydrological and Hydro-Meteorological Services are the prime providers of river discharge data. GRDC is in permanent contact with a large number of national services and other national bodies in the fields of operational hydrology. The responsibility for hydrometric and hydrologic data varies from country to country. Depending on geographic conditions and political priorities, operational hydrology is the responsibility of the energy, agriculture, transport or environment ministries. Most often real-time data and historic data are managed by different institutions.
Further information:
WMO Member States and Member Territories
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