The provided text originates from Australian Rainfall and Runoff (ARR), specifically focusing on Book 9: Runoff in Urban Areas, which serves as a definitive guide for flood estimation and stormwater management. It details a shift from traditional calculation methods toward evidence-based computer modelling and integrated water cycle systems to better manage urbanisation's impact on hydrology. The sources outline essential strategies for stormwater conveyance, volume management, and flood risk mitigation, including the use of detention basins and on-site storage. Technical guidance is provided on calculating energy losses in drainage networks, def ...