In recent years, the concept of Digital Twins has gained remarkable traction across various sectors, revolutionizing how we understand and manage natural and human (complex) systems. A Digital Twin is a virtual representation of a physical entity, with a typical “twinning” connection where real-world data inform the virtual model, and vice versa outputs from the virtual model inform decisions in the real world. One of the areas where this technology holds immense potential is Civil engineering, and in particular catchment management. By developing a Digital Twin for catchments, we can gain valuable insights into the hydrological and ecological dynamics, leading to more informed decisions and practices around flood management, water resources, water quality and beyond.