How does effective rainwater management benefit wastewater systems?

Effective rainwater management plays a crucial role in enhancing the performance of wastewater systems by reducing the overall volume of stormwater runoff. When stormwater is managed properly, it minimizes the chances of flooding, which can overwhelm wastewater treatment facilities. This is particularly important in areas with combined sewer systems, where stormwater and sewage share the same pipes. During heavy rainfall, these systems can become overloaded, leading to combined sewer overflows (CSOs) that can discharge untreated sewage and pollutants directly into local water bodies.

By effectively managing rainwater—through practices such as green roofs, permeable pavements, and retention ponds—stormwater can be diverted or absorbed before it flows into the sewer system. This not only helps prevent CSOs but also minimizes flooding in urban areas, contributing to more stable and effective wastewater management overall.