From January 2018 to December 2022, the Federal Ministry of Education and Research (BMBF) is funding the junior research group SEE-URBAN-WATER under the leadership of Prof. Dr.-Ing. Jochen Hack at the TU Darmstadt. The junior research group, consisting of the leadership, four doctoral students and an assistant, will deal with problems of urban water pollution in developing countries inter- and transdisciplinarily for five years. The city of León in Nicaragua serves as a case study. Together with cooperation partners from science and practice, local authorities and civil society, nature-based solutions are to be developed for the local context.