This is a project with a School from Brühl, (Germany), Luzern (Swiss), and Binissalem (Spain) In a context of climate change, water is a key point. Flows, droughts, water pollution, are disturbing our way of life. Students will know how the water supply works, its handling, conservation and cleaning. Work will also be carried out to find out what circumstances must occur so that extreme rainfall causes flooding with great damage to infrastructure and especially to human beings.