focus on infiltrations of rain water on a surface level of a concrete flooring blocks with grass permeable to water

water infiltration drainage infiltrate paving wet leaking seepage rain pavement flooring stone examining building activity construction industry surface level material floor concept concepts exterior outdoors searching magnifying glass checking cement paved interlocked damage sidewalk cobblestone cobblestones car park parking area lot concrete permeable grass beton self locking interlocking permeability tiles