Permeable paving surfaces have been demonstrated as effective in managing runoff from paved surfaces and recharging groundwater aquifers. Large volumes of urban runoff causes serious erosion and siltation in surface water bodies. Permeable pavers provide a solid ground surface, strong enough to take heavy loads, like large vehicles, while at the same time they allow water to filter through the surface and reach the underlying soils, mimicking natural ground absorption. They can reduce downstream flooding and stream bank erosion, and maintain base flows in rivers to keep ecosystems self-sustaining. Permeable pavers also combat erosion that occurs when grass is dry or dead, by replacing grassed areas in suburban and residential environments. The goal is to control stormwater at the source, reduce runoff and improve water quality by filtering pollutants in the subsurface layers.