Drainage pavement, with prefabricated concrete pieces and grass

Drainage pavement, for pedestrian traffic, with a flexural strength of 3.5 N/mm², a drainage capacity of 144 l/(m²·min) and with a sliding resistance Rd>45 according to UNE-EN 16165 and slip resistance class 3 according to CTE, formed by a compacted leveling layer of sand with a granulometry of 0 to 5 mm in diameter, clean, 5 cm thick, prefabricated drainage concrete pieces of 60x40x9.5 cm, gray color, with holes filled with gravel of 5 to 10 mm in diameter and a filling layer of sieved soil and a mixture of grass seed covering the alveolar grid.