Assessing global freshwater resources and human water use is of value for a number of needs but challenging. The global water use and water availability model WaterGAP has been in development since 1996 and has served a range of applications such as assessments of global water resources and water stress, also under the impact of climate change, drought hazard quantification, Life Cycle Assessments, water (over)use and consequently depletion of water resources and a better understanding of terrestrial water storage variations (jointly with satellite observations). Here, the reader can download daily model output for water storage variables for the time period 1901-2019 (2023) that was computed by driving WaterGAP v2.2e by two alternative climate datasets (climate forcings) that were generated in the ISIMIP context (https://www.isimip.org) and are described in https://data.isimip.org/10.48364/ISIMIP.982724. In the paper connected to this dataset (in review with Geoscientific Model Development), the newest model version, WaterGAP v2.2e is described by providing the modifications to the previous version v2.2d (Müller Schmied et al. 2021) and the corresponding changes in model output. Here, the single water storage compartments and terrestrial (total) water storage are provided.

The data is available in compressed netcdf data format. The spatial resolution is 0.5 deg x 0.5 deg, the temporal resolution is daily. The name pattern is the following: [modelversion]_[climateforcing]_[variable]_[socioeconomic-setting]_[temporal-resolution]_[startyear]_[endyear].nc This dataset contains WaterGAP 2.2e model output with the climate forcing gswp3-era5. The socioeconomic-setting is "histsoc" (time-varying direct human influences such as reservoir and water use). The start year is 1901 and end year is 2023. Please note that this is not an official ISIMIP forcing but was generated using similar methods as the other climate forcings but prolonged by actual ERA5 reanalysis data. For further information please see the associated paper.