State of Global Water Resources 2022

The WMO State of Global Water Resources Report 2022 builds on a pilot issued last year. It contains more expanded information on important hydrological variables like groundwater, evaporation, streamflow, terrestrial water storage, soil moisture, cryosphere (frozen water), inflows to reservoirs, and hydrological disasters. It integrates field observations, satellite-based remote sensing data and numerical modelling simulations to assess water resources at the global scale.

With the inclusion of new components, based on increased observational data and modelling results, the present report offers a comprehensive view of the status of global water resources. The goal remains to amplify observational data and further the involvement of countries for a better understanding of water cycle dynamics. It is hoped that future reports will work with even more in situ data, aided by initiatives like WMO’s Hydrological Status and Outlook System (HydroSOS).