With aggregate infill, porous systems create a natural stormwater storage system by allowing water to percolate into the ground, decreasing stormwater runoff and allowing natural groundwater replenishment. Aggregate with 35-45% void space creates a stormwater storage area that allows stormwater to slowly permeate into the existing ground while supporting loads. With 87-98% open surface area, porous pavement systems provide benefits over traditional hard surfaces, including:
- Lower development and construction costs by minimizing use of valuable land for stormwater holding systems.
- Lower cost of stormwater collection and discharge systems as reduced stormwater runoff allows the use of smaller, less expensive discharge pipes.
- Lower future cost of ground maintenance as potential turf damage caused by loading is significantly reduced.
- Direct replenishment of ground water as stormwater percolates into the ground through the open design.