GR-VIS is a web-based platform (gr-vis.ethz.ch/zh) for spatially explicit visualization of standardized alternatives of riverine zones according to the specifications of the water protection act. Additionally, it offers criteria and basic data for different topics that planners need to take into account in a structured and clear form. Furthermore, users can upload own alternatives of riverine zones and assess them in the context of the other criteria. This visualization platform shall support the inclusion of the relevant information for defining riverine zones and weighing different interests against each other.