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SuDS tree pits provide Dutch drainage solution

As part of the EU’s Water Resilient Cities project, the urban tree planting specialist is working with Middelburg municipality to put in SuDS tree pits.

The rainwater from the De Overloper neighbourhood will be led into the swale via gutters or ditches. As a result, the combined and rainwater sewer systems will be separated.

However, the 8th century city’s sewage system struggles to cope with heavy rainfall events and there isn’t enough space in the city centre to install bigger sewer pipes, and making the sewer system larger would be too expensive.

So, on two Middelburg test sites, the swale will be connected to a pond to discharge the excess rainwater. The drainage interventions will be integrated into reconstructed roads and the excess water will be stored and buffered.

GreenBlue Urban will now begin installation of its Arborflow system. This involves digging a tree pit with a gravel and mesh layer, installing the approximately two foot tall RootSpace system to accommodate tree planting and existing services, followed by the infill of soil.

The tree planting will follow soon, and a full case study of the test site will be conducted thereafter.

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