Cuyptuin, Roof Top Blues in Amsterdam

The Green tower I had build was inspired on quite some other projects I had found on the internet. The most inspiring one was of Folke Günther with his Folke Wall. I lost his website for quite a while and just found it back. I send him an email with some photo’s of my own experiment and I was delighted to found it answered’. I will come back on that, Folke !

I like your crater idea! The general principle is very much like the one Gus Nilsson used originally. letting the water trickle down through two-chambered building stones placed crosswise as your craters. I suppose that you realize that they can be extended to a more wall-like building, lacing the crtes beside each other. I would propose two improvements to your wall:

Firstly, replace a large part (up to 50%) of the soil in the craters with char, crushed in pieces less than a centimetre.
Secondly: Collect the water that have passed through the column and pump it up again, using a simple aquarium or garden pond pump driven by a **photovolaic ** or a simple wind pump. If you can let the water pass two times through the column, you have increased it ‘virtual’ size by two! (The water in the Gotland plant returns about 20 times!) Naturally, you have to take care of the superflous waterin some way, but I expect you already do that. Take alook at the tire wall. I think it is something for you. But I fear your landlord will go ballistic if yo start collecting tires on the roof