ABSTRACT
One of the major tasks in urban development is to provide adequate stormwater drainage systems to preserve the water environment and to promote the public health and economic well-being of the region. Regional Master Drainage Planning (RMDP) is an approach that integrates both local and regional efforts to identify drainage conveyance and storage facilities based on hydrological optimization and cost minimization individually and collectively. The risk-based approach applies to the selection of design storm events, based on public perception, federal regulations, watershed physical characteristics, economics, and safety. Urban drainage design takes a risk-based approach. It is important to maintain consistency in selecting design events. The urbanization process generally increases runoff rates (Q-problem) and runoff volumes (V-problem) to downstream properties owing to the increases in impervious area, including more buildings, streets, and parking lots. A stormwater detention basin is designed to have a large storage volume for controlling the extreme flood events.
