On this location called ‘’De Bloem” in 1914 a few flower growers decided to start up a Flower auction, first known as Bloemenveiling Flora, but recently known as Royal Flore Holland. After a few years the location in Rijnsburg got too small for the flower auction so the decision was made to create apartments on this location. The result is project ‘’De Bloem”, a very special complex including houses and apartments, that not only has the name of the original location but also some architectural trademarks that refer to the history of this location.

Especially from above the references to the old flower auction are obvious. Besides the flower names of the streets, the complex has been given the shape of a flower, completed with leaf veins in the paving. An important part of this project is the construction of an underground parking. Quite a challenge, because the roof of this parking also constitutes as a courtyard for residents of “De Bloem”. A multifunctional roof, that not only is green, but also is trafficable for residents and visitors: by foot, bicycles and (large) vehicles. Luckily, the high compressive ND Drainage Systems are fully able to handle loads.

Multifunctional roof
Because the roof will be used for different purposes, the roofing must of course take this into account. ‘Various drainage systems, developed and custom-made by Nophadrain, have therefore been installed. Simply explained, there is a “normal” type for walking on, and a special type that can also handle the pressure of heavy transport. This lies under the roadway and parking areas. In addition to normal passenger cars, ambulances, fire trucks and the like must of course be able to get here. The stability of such (drainage) systems, especially with parking roof systems like the one at De Bloem, are extremely important.

The power of the system
For the drivable roof of the Bloem underground parking garage, Nophadrains ND ND TSF-100 Slip and Protection Sheet was finally chosen, topped with the robust ND 620hd Drainage System. Therein lies the strength of the parking roof system – literally. The pressure-stable ND 620 Drainage System (for passenger cars) or the ND 620hd Drainage System (for emergency and emergency services and heavy goods vehicles) prevents the build-up of water pressure against the roofing system, and in combination with the sliding and protective film, protects the roof from the static and dynamic traffic loads that occur. The strength, up to a pressure of 1,200 kPa, the studs in the ND 620hd Drainage System owe their strength to the material, called HIPS (high impact polysterene), and their shape, which distributes the weight evenly.

For the green areas, the ND 4+1 Drainage System was used.
The fact that different types of systems are used contiguously is not a problem, by the way.
The different ND Drainage systems are well matched.