Which strategies can be implemented to enhance filtration in a SWPPP?

The strategy of incorporating permeable pavements and green roofs into a Storm Water Pollution Prevention Plan (SWPPP) is effective in enhancing filtration because both elements promote the natural infiltration of stormwater. Permeable pavements are designed with voids that allow water to pass through, filtering pollutants as stormwater percolates into the soil below. This process helps reduce surface runoff, minimizes flooding, and improves water quality by capturing and treating pollutants.

Green roofs, on the other hand, consist of vegetation planted over a waterproof membrane. They absorb rainwater, which not only helps with filtration but also reduces the volume of stormwater runoff. The plants and soil medium on green roofs act as natural filters, trapping particulates and absorbing nutrients.

Together, these practices contribute to more sustainable management of stormwater by encouraging infiltration and reducing the quantity of pollutants entering the drainage systems. Implementing such strategies aligns with the goals of a SWPPP, which aims to mitigate the impact of pollution from stormwater runoff.