grey concrete draining flooring blocks with grass permeable to rain water used for sidewalks and parking areas

drainage draining floor permeable permeabile paving porous absorbent waterpermeable flooring grass permeability tiles waterdraining pavers stone pavement penetrable percolative percolating concept concepts cobblestone sidewalk cement concrete tile cobblestones material car park parking lot garage interlocked beton self locking building activity space interlocking tileparking area selflocking blocks brick paved slab stones