Impacts of Extreme Rainfalls on Sewer Overflows and WSUD-Based Mitigation Strategies: A Review

Extreme rainfall events cause an increase in the flow into aging sewer networks, which can lead to Sanitary Sewer Overflows (SSOs). This literature review presents a complete assessment of application Water Sensitive Urban Design (WSUD) approaches as mitigation strategies for reducing rainfall-induced SSOs. The highlights various WSUD techniques identified past studies overflows. In these studies, it was that permeable pavements, green roofs, raingardens/bio-retention cells and rainwater tanks were most popular have been extensively used or “green” also enormous environmental, social economic benefits when compared conventional “gray” overflow mitigation. However, there limited conducted highlight quantify mitigation, particularly such are applied at large scale (e.g., city scale). has modelling software, SWMM, be widely tool modelling. It with climate change-induced extreme on increase, WSUD-based alone may not enough A suitable strategy could hybrid green-gray strategy, would need based detailed context specific analysis.