What is the primary function of a storm sewer?

The primary function of a storm sewer is to remove rain or standing surface water. Storm sewers are specifically designed to manage excess rainwater and surface runoff, directing it away from populated areas to prevent flooding and to ensure safe drainage during heavy precipitation events. This is essential for maintaining the integrity of roads, buildings, and other infrastructure, as well as protecting public health by minimizing water accumulation that could lead to mosquito breeding or other health risks.

While the removal of sewage and storm water, household wastewater, and hazardous waste are important aspects of overall water management in urban environments, these functions are typically managed by separate systems—sanitary sewers for sewage, and specific hazardous waste management protocols for toxic materials. The storm sewer specifically addresses stormwater drainage and helps to minimize the impact of flooding on the environment and urban infrastructure.