What type of sewer system allows storm water to discharge directly into a surface water body?

The correct choice, which indicates the type of sewer system that allows storm water to discharge directly into a surface water body, is the separate sewer system. This system is designed specifically to handle stormwater and sewage separately. In a separate sewer system, storm water is collected through its own network of pipes and is directed to nearby water bodies, such as rivers, lakes, or oceans, without passing through a wastewater treatment facility. This is beneficial in reducing the risk of sewage overflow during heavy rain events, as the stormwater is managed independently.

In contrast, combined sewer systems transport both sewage and stormwater together. During heavy rainfall, these systems can experience overflow, resulting in untreated sewage being released into water bodies, which is typically undesirable from an environmental and public health perspective. Traditional sewer systems may not accurately represent a specific type but could imply combined systems, leading to similar issues of overflow. Interconnected sewer systems are often designed to link different sewerage systems but do not inherently allow for direct stormwater discharge without treatment.

Understanding the distinctions between these systems is essential for effective stormwater management practices, particularly in urban environments where impervious surfaces can lead to increased runoff.