The Netherlands has a long history of water management. To operate and design our water system in a changing environment, we need computer simulations. Deltares is currently developing the next generation water resources software Ribasim, which will be used in the Dutch National Hydrological Model. The core is written in Julia on top of the SciML stack.

In this talk we will show the design of the application and discuss strengths and difficulties of Julia and its ecosystem for such a use case.