200 - Unveiling the Symphony of Sewer Geysers: A Call for Increasing Research to Address the Replacement and Retrofitting of our Aging Stormwater and Combined Sewer Infrastructure

Sewer geysers in stormwater or combined sewer systems manifest as sequential eruptions of gas and liquid mixtures within dropshafts (i.e., manholes). These geysers are triggered by heavy rainfall, resulting in the entrapment and subsequent release of air. The severity of sewer geysers can vary, but their aftermath poses significant threats to public health, safety, and the environment. Contamination of drinking water sources and potential harm to both public health and the environment are primary concerns. Additionally, the associated infrastructure and property damage can be substantial. Sewer geysers epitomize the symptom of obsolescence, urging cities to embrace resilience strategies fit for the climate change era. Proactive measures encompass infrastructure upgrades and improved stormwater management. Cities worldwide face mounting challenges in safeguarding their stormwater systems against the destructive forces of nature, exacerbated by climate change. Understanding the dynamics of sewer geysers is crucial for devising effective mitigation strategies and promoting resilient urban environments. By employing advanced laboratory techniques, this research sheds light on the causes, magnitude, and impacts of sewer geysers. The aim of this study is to comprehend the underlying mechanisms responsible for the occurrence of violent geysers in storm sewer systems using numerical simulations and field-scaled laboratory observations. Based on the findings, this work underscores the need for innovative and resilient stormwater management strategies. It advocates for a comprehensive approach that encompasses infrastructure upgrades and enhanced monitoring systems. The outcomes of this research provide valuable insights and practical recommendations for urban planners, engineers, and policymakers grappling with the challenges of stormwater management.