The incredible fourth year of the Science Fair is behind us! Almost 25,000 visitors came to see unique exhibitions in three days. The stand of the Institute for Hydrodynamics was very popular and appreciated by the visitors. People could see on posters what processes water had to pass to get from the source to human households and where it went further, before it could be returned back to the environment. A pilot plant of water treatment was installed. Floods could be modeled using a special flood model. Interesting water experiments were prepared for children.