What is the primary objective of retrofitting existing stormwater systems?

The primary objective of retrofitting existing stormwater systems is to modify these systems to improve water quality. This practice addresses the need for enhancing the effectiveness of older or inadequate systems that may not meet current environmental standards or are unable to handle modern stormwater management challenges.

Retrofitting often involves adding features such as bioretention areas, green roofs, or permeable pavements, which can help filter pollutants, reduce runoff volume, and increase infiltration. By improving the functioning of existing systems, retrofitting plays a crucial role in protecting water resources and ensuring compliance with regulatory requirements.

In contrast, replacing systems entirely would entail significant costs, may not be feasible in all situations, and is not the primary focus of retrofitting efforts. The goal is to utilize and enhance what is already in place. Eliminating all stormwater runoff is impractical and not aligned with typical stormwater management practices, as some runoff is inevitable and necessary for maintaining the hydrological balance. Lastly, increasing impervious surfaces goes against the aim of improving water quality, as it typically leads to more runoff and associated pollutants entering water bodies. Thus, the emphasis is on enhancement rather than replacement, removal, or increasing imperviousness.