HOM introduces a hydrologic approach to mediations between arts, sciences and humanities. Its main objective is to explore the water properties and effects in our aesthetic, cultural, scientific and educational practices. We study the materiality and the imaging of water representations by making direct interventions in artifacts and methods for scientific analysis. We adopt a multidisciplinary and multicultural procedure to ask the following questions: How to represent water at scales that are invisible to the human eye yet crucial to take into consideration? How to provoke new aesthetic reactions capable of generating a hydrologic conscience? The project was funded by EUR ArTeC from January 2020 to December 2022. Currently, starting January 2023, HOM presents itself as in international initiative - open to collaborations interested in weaving a network of people, resources, materials, methods, places, histories, documentation, datasets, experiences, and water-related species.