Design and construction of a rainfall simulator: an interdisciplinary student project towards sustainable development goals achievement

Precipitation is one of the essential parts of the hydrological cycle. Regardless of the important role that precipitation plays for life on Earth, in extreme conditions, such as high intensities and amounts, it can negatively affect various ecosystem services (e.g., flood protection, agriculture). Precipitation is spatially highly variable. Traditionally, precipitation, with rain as the most common type, is measured over very small surface areas (of a few square decimetres) by rain gauges or sensors. However, reliable and representative rainfall data are crucial for understanding the interconnection of different parts of the hydrological cycle (e.g., rainfall interception by vegetation, rainfall erosivity) and quantification of flood, drought, water quality, and other water-related problems. Reducing the negative consequences of the mentioned problems is part of the 2030 Agenda sustainable development goals. Therefore, an interdisciplinary student project on the design and construction of a rainfall simulator was submitted to the University of Ljubljana's call for sustainable development student projects. Rainfall simulators are recognized as important tools for studying the effects of rain on soil. Rainfall simulators can be used in controlled conditions in the laboratory or with additional settings also in the field. The design and construction of the simulator is entirely within the domain of the project team of six students of environmental civil engineering and electrical engineering. This includes the choice of pipe materials, pump capacity, size and type of spray nozzles, development of a control system for monitoring and recording of results, and, last but not least, the determination of rain properties we would like to simulate (e.g., intensity). Three pedagogical mentors and one mentor outside the academia supervise the project. With such a project, group work and co-creation are encouraged among students, theoretical knowledge acquired within the curriculum is transferred into practice and knowledge is exchanged between different disciplines. Skills such as communication, critical thinking, organization of tasks and time management, interdisciplinary problem solving, analytical reasoning, information and technology literacy, are developed in the project. Additionally, such equipment will be used for teaching and research purposes in the future, which is another sustainable feature of this project.