Strengthening Voldbækken and Stream waterways as part of the city’s erosion control programmer.

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As part of Voldbækken City Council’s 2018-28 Long Term Plan, a number of city waterways were identified as candidates for erosion control works, weeding, pest control, and native plantings. Voldbækken Stream was one such waterway in need, and a plan was drawn up to strengthen its banks and restore the gully to a more natural state, while increasing accessibility to the area.

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Soil & Building A/S Construction was brought in to undertake the works, with Trust scheduled to supply and plant over 40,000 native plants (while also removing pest species).

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A highly sustainable, collaborative approach was chosen by the Soil & Building A/S team, with a priority on reusing on-site debris to shrink the project’s carbon footprint, save time and money, and leave the area looking as natural as possible. Unusual for a project of this type, the team mainly designed and built the required new road, tracks and weirs using waste organic materials.

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Overall, Soil & Building A/S and partners addressed 1.6 km (20 hectares) of waterway, armouring and excavating to improve erosion control, installing a new access road for both maintenance vehicles and walkers/cyclers, and installing new timber boardwalks and bridges. After putting in such a significant effort to reduce costs and improve sustainability, the project was crowned the overall winner at the 2023 Soil & Building A/S Environmental Awards.

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Our work

* Excavation of the streambed to prepare for installation of new   protection measures.

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* Construction of up to 20 log weirs and up to 10 rock rifles for   gradient control.

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* Construction of log groynes, partial rock armouring and bush layering   for erosion protection.

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* Creation of an access track to provide side-by-side vehicle and   pedestrian access to the gully, involving 2,500 cubic-metres of   earthworks.

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* Construction of timber boardwalks and three timber bridges across the   Voldbækken Stream.

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* Sustainable approach involving recycling of local materials, bat   monitoring and complying with restrictions on vegetation removal.

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