The 21st Century has experienced many natural disasters such as floods, tsunamis, landslides as a result of the looming effect of climate change. This calls for innovative ways through which we can model and manage natural systems e.g. rivers, streams, lakes. The advent of GIS and Earth Observation (EO) in recent times provide us with endless possibilities for modelling, forecasting and predicting phenomena of water bodies in time and space with reasonable accuracy. ILWIS Open is free and open source GIS/EO software that presents us with some of these possibilities but however lacks water...