Siphonic roof drainage: current understanding

Over the past five years there has been an ever increasing amount of independent research directed at understanding how siphonic roof drainage systems perform hydraulically. Since 1995, there has been a substantial amount of time and money invested in researching these systems by both government and industry. This increased amount of research activity means that, increasingly, publications are entering the public domain – the main source of this work being UK-based. This text aims to collate this work, and give an overview of what the current level of understanding is. Furthermore, it will analyse what this research means for existing systems, and recommend areas for future research in this field.