Plastic litter is prevented from entering the Sea.

Floating parks realized by recycling the plastics to platforms.



Height differences

The blocks can have a different section. Considering floating green, we can realize blocks that are as well above as under the water level. Further variation in height will result in a curved landscape. Larger trees can be placed in tree containers especially designed for this purpose.

In the variation of building blocks different new landscapes will arise. A new city park can be constructed that will have its own unique character as floating landscape in the river.

The floating park can take a valuable role in the city expansion on the water where we facilitate in a public green area for the neighborhood as well the city. The city park can facilitate all regular green facilities as sport- and playfields, together with more water-related programs.


Obviously, the floating characteristic will allow (part of) the park to relocate to suit festivals or new urban development.

Green shores

A possibility that arose through our contact with the Rotterdam municipality is the softening of the river shores. In Rotterdam there is the desire to soften the majority of hard shores. The demolition of the existing shores and replacing them by natural slopes is an expensive adjustment. The floating green structures can provide an efficient alternative. With a variation in height and depth floating platforms can be situated to provide new green areas in and on the water. In and along the green shores fish, birds and other organism can nest and breed. Additionally a combination with accessible city parks is possible, with the green shores as attractive public space.

3D impression aerial view variants building blocks

3D impression under water view variants building blocks

Section variants in building blocks


For the retrieval of the plastic waste from the river we use passive litter traps.

First, samples are taken from the river with a self-built boat. This is to find the best location and depth of the platform. Of all the plastic waste 98% turns out to be in the upper meter water level, from which even the most in the upper half meter. The litter consists of organic and inorganic waste as plastic wrapping, foils, bottles, cans, spray cans, bags, etc..

Together with HEBO maritiemservice we are further developing the passive litter traps that will be permanently installed on strategic positions along the rivers.

Building blocks  

Students of Rotterdam University have, under our guidance, already set up a principle for the building blocks that together will shape the floating landscape. These blocks have a hexagonal plan and are connected with a pen. As a temporarily measurement, the blocks have sides of two meters long. The definitive measurement can only be decided upon after the analyses of the plastics and the strength we can create in recycling or reinforcing. The chosen shape of the blocks is used as starting point for further development and will function as a basis to create variations. Students of the TU Delft have further developed the building blocks.

With Wageningen University (WUR) we analyze the plastics that we take from the river and research the plastic process to create the product of floating building blocks. An important aspect is that we want to reuse all the plastics we find. It is crucial and we prefer not to have any remaining waste.

One of the possibilities that we explored is the separation of plastics in sort and its individual use for different parts of the new product. For example, a different use matching the floating capacity and necessary strength.  

With the development of the building blocks we do hope, that one day the plastic pollution will become less. Not to let the current investment go to waste, we are looking into an alternative future building material. We believe to find a good follow-up building material in bio-based composite.

Bio-based composites are fiber reinforced plastic constructed completely or partly from renewable materials. The plastic as well as the fibers can have a natural origin. Bio-based composites are, for example, used in construction. Bio plastics and bio-based wax have environmental benefits as they have a reduced carbon footprint and less exhaustion of fossil raw materials.

The production process for the building blocks will be suited to take a simple step from plastic recyclate to bio-based materials.  


On top of the blocks we can, similar to a roof garden, create a green environment. In this we thrive to have a wide variety in plants from moss to trees of a few meters high.

By connecting the blocks a big floating platform can be created, where on top, to and under a green facility can be created. An important aspect and extra value of the floating elements is that they also have a bottom that will be beneficial to upgrade the ecosystem of the river. At the bottom algae’s and different plants can attach, where fish and other marine life can safely put their eggs. To improve the ecosystem to its optimum, we will collaborate with an ecologist who can advise us in these aspects.

Photo: passive litter trap in Rotterdam

Construction principle floating platform in composite scale model

3D section of a possible structure of the building block in different kinds of plastics and parts

Erosion protection profiled foil.

For example: Polystyrene (PS)

Impact resistant shell For example: Polyethylene (PE) or Polypropylene (PP) with fibers

Improvement ecology; rough structure for attachment organism. For example: molted additional plastics

Floating capacity, lightweight core.

For example: Expanded Polystyrene (EPS)

3D impression prototype Recycled Park

WHIM architecture © Colofon