The Global Freshwater Model
To support the sustainable development of the world's water resources, the global freshwater model WaterGAP computes water flows and storages as well as water withdrawals and consumptive uses on all continents. It is applied to assess the human – freshwater system under the impact of global change.
WaterGAP is being developed mainly at the Universities of Kassel and Frankfurt (comp. Wikipedia article). Its development and applications are documented in a large number of publications.