A student thought of this model. It is based on the water flow data and projections on pages 68 and 69 of LTG30.
It models all the available freshwater in rivers and dams in one year, which is represented as a stock.
The water flowing in is all the world's runoff, and the water flowing out is in two categories: Water used by people, and water not used by people.
This model uses a converter which allowed us to enter the UN projection of water use in 2050. Click on the converter to see how it works.
