State of Global Water Resources 2021

As a first edition of the annual State of Global Water Resources, this report shows how maps and a graphical summary of streamflow and TWS in river basins worldwide could look in regular reports on global water resources. These maps are based on modelled data (and validated with observed data to the extent possible) and remotely sensed information from the NASA GRACE mission for TWS. Modelled data was used to achieve maximum geographical coverage. The 2021 report also includes chapters on major hydrological events in 2021 and a brief overview of cryosphere changes as they related to water resources.