High-performance CE-marked drainage system with an innovative dimple design made out of recycled high impact polystyrene. The core of the ND Drainage System is a dimpled sheet with a very high compressive strength and a construction height of approx. 12.5 mm. A special monofilament woven geotextile is bonded to each dimple as a filter layer. The ND 600 Drainage System is a component of the Nophadrain Parking Deck System – cars that acts as a filter, drainage and protection layer.