In the years 2017 to 2019, Soroptimists around the world were called upon to advocate for the topic of "water". The first SI DANUBE conference in Ruse, Bulgaria, concluded the "Danubius" education project.

Children are taught in a practical way and in cooperation with schools about the necessary protection of the natural environment of the Danube and about water quality. Further projects under construction are mutual visiting programs for women.