The parking garage on the Colosseumweg has a walkable parking deck with intensive vegetation on top. The EU’s biggest mosque is also located in this area. The complete system which has been utilised here has high compressive strength, making the parking deck safe for vehicular traffic. This system also makes it possible to grow greenery on top. When sealing cellars and parking decks, it is important to prevent leaks, especially when these are equipped with green zones. The Nophadrain Parking Deck System minimizes such risks while making optimal use of public space.