Patent ID: 6877932

Claim:
A synthetic grass turf drainage system for installation on a supporting soil substrate to provide an easily drained synthetic grass turf surface, the drainage system comprising: a synthetic grass turf assembly having a flexible and water permeable sheet backing from which a plurality of upstanding synthetic ribbons extend, the sheet backing defining an upper surface and an under surface, an infill layer of particulate material being disposed interstitially between the upstanding ribbons on the upper surface of the sheet backing; an impermeable membrane disposed on top of the soil substrate; and a structurally self-supporting three-dimensional spacing device having a top and a bottom surface defining a spacing distance therebetween, said spacing device being disposed between the impermeable membrane and the synthetic grass turf assembly such that bottom surface thereof abuts the impermeable membrane and the top surface thereof abuts the under surface of the sheet backing, the spacing device thereby elevating the sheet backing away from the impermeable membrane on the soil substrate by said spacing distance, the spacing device having draining passages in both vertical and substantially horizontal directions throughout said spacing distance such that drainage in both vertical and substantially horizontal directions is possible at any elevation between said sheet backing and said impermeable membrane.