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Infiltration / Detention

Heavy rains are expected to become more common and more intense due to climate change. Being able to capture and infiltrate stormwater on site will be a cost-effective solution to a major environmental problem for society.

A major problem in urban environments with large paved surfaces in the form of asphalt, tiling, paving and the like is that the natural filling of the groundwater is hindered, which leads to the groundwater level falling. A lowering of the groundwater level can lead to changed flow directions within a groundwater body. Among other things, this can lead to polluted water being transported to drinking water wells where the flow direction was previously directed away from the wells.

Investments in real estate are also a risk as the pores in e.g. clay soil becomes air-filled and over time is packed. A lowering of the stormwater by one meter in clay soil means that the ground is lowered by 1 cm, which can result in damages on the properties.

In other words, we must become much better at infiltrating stormwater on the spot!

Thanks to our collaboration with Graf, we can offer the market's smartest solutions in infiltration and detention of stormwater!

Not only are the solutions quickly built together on site, they are delivered to the workplaces in a very cost-effective and environmentally friendly way as all the parts take up minimal space on the trucks. On a single truck, we can fit up to 630 m of finished magazine, which corresponds to the total volume of six trucks!

Otto Graf in the city of Teningen in Germany is one of the world's largest plastics companies and was founded in 1962 with today more than 600 employees whose products are exported to more than 70 countries worldwide. Environmental thinking permeates Graf's entire business. Graf has its own recycling plant where the recycled plastic is made into plastic granules on site in the factory.


On site in one of Graf's factories in Teningen is the world's largest plastic injection compression machine. 

A major advantage of building an infiltration plant with large modules is the time required at the construction site. As an example, it can be mentioned that an EcoBloc Light module is 800x800x350mm large and holds a full 219 liters of water while it only weighs 7Kg, which makes it very flexible and easy to assemble.

Infiltration is much more complex than you might first think and there are very many factors to consider when designing one project and no two projects are alike. Therefore, we have compiled a form that we need to use as a basis to be able to design the best solution for your particular project. You will find the form at the bottom of the page.

Depending on what the requirements are for the infiltration plant, we currently have four different varieties to choose from.


If you want a detention magazine, as usual you wrap the finished module in geotextile but also another layer with a 1mm thick LLDPE film (a kind of plastic film that is extremely durable) which is welded together to be completely waterproof, then an additional layer of geotextile to ensure that the gravel won't cause any holes in the plastic film.

In the EcoBloc series, there are three different models:

Inspect Flex is used for facilities where inspection opportunities are required.

EcoBloc Maxx is a really powerful model that can withstand very high loads despite a relatively low earth covering.

EcoBloc Light is used where the load above will not be so high, e.g. on green areas or similar.


Infiltration tunnel is a separate system where several sections can be connected in long rows, it is also possible to install them "twice" to double the volume.

Read more about each system at the links below!

A smart way of thinking to ensure a sustainable future – we call it Eco-Logic!

EcoBloc Inspect Flex


EcoBloc Maxx


EcoBloc Light


Infiltration tunnel


Reference object:

Olympia Park Madrid, Spain

Click here to download the reference object in pdf format.

Highway SS16, Molfetta / Giovinazzo, Italy

Click here to download the reference object in pdf format.

New construction apartments, Lutvanntoppen Eidsberg, Norway

Click here to download the reference object in pdf format.

New construction residential area in Bétera (Valencia), Spain

Click here to download the reference object in pdf format.

If you have an upcoming infiltration project, we are happy to help you with both design and cost proposals!

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