Greenleaf Retreat: permeable pavers

Permeable paving in the driveway allows water to drain into the soil slowly. This takes stress off sewer and storm drainage systems. Specially designed concrete pavers with gaps let the water flow through to the underlying gravel. The gravel — which has no fine particles — provides a place for beneficial microbes that help clean the runoff water. Pollutants are filtered out before they reach streams and Puget Sound.