PODIUMSim provides a framework to develop scenarios of water and food supply at river basin, sub-national and national level. It is an interactive tool that runs on a personal computer, and has a Microsoft Excel interface which has been configured using Visual Basic programming language. It can generate scenarios at sub-national level, for example, at river-basin or administrative boundary level. The aggregated results provide the national situation. The model can be used by policy planners, researchers, students and others who are interested in developing water and food supply and demand scenarios under different policy options or hypotheses.