Climate adaptationSewage

Urban development in Køge Nord creates more nature and increases biodiversity

In an interdisciplinary collaboration with the landscape architecture firm Schønherr, Envidan has created green building development, a breeding ground for increased biodiversity and innovative purification solutions for KLAR Forsyning north of Køge.


KLAR Forsyning


Green building, wastewater treatment solutions, stormwater ponds and biodiversity enhancement





The capital’s new sustainable district

Køge Municipality has designated an area of about 130 ha. in the northern part of the municipality into a new and sustainable residential and commercial development area. The vision is for Køge Nord to be the capital’s new sustainable district, where blue and green areas and corridors will function as “green development” that, in addition to creating urban nature, will also add value to the future building sites.

KLAR Forsyning is working to establish multifunctional, recreational rainwater solutions with a high degree of treatment to contribute to the fulfillment of Køge Municipality’s vision and to comply with environmental requirements, where there has been a particular focus on limiting phosphorus discharge to the two streams, Skensved Å and Snogebækken, due to a downstream Natura 2000 area.

In this connection, Envidan has acted as a total consultant together with Schønherr and designed, planned and supervised the establishment of all rainwater and wastewater systems in close collaboration with KLAR Forsyning and the contractor Tscherning.

Flexibility and continuous dialogue ensure a good process

Envidan has carried out total consultancy in collaboration with the client, KLAR Forsyning, the landscape architecture firm Schønherr and contractor Tscherning. Throughout the project, several planning and execution stages in different sub-areas of the project area have been worked on at the same time in order to stay on schedule and exploit synergies. The project requires ongoing dialog with the developers and Køge Municipality, so flexibility and overview are keywords for planning, design and execution.

A multi-stage construction process

Three stages of 6-8 sub-areas are planned, of which four have been constructed, including the area north of the new station. Here, rainwater is collected for treatment after a new treatment solution in the Green Street, which in a narrow space and high square meter prices creates a total volume of about 3,000 m3. The plant consists of five interconnected basins which, through a combination of Sedipipes and planted sand filters, provide the necessary effective retention and treatment, particularly aimed at phosphorus removal. These facilities were handed over in September 2020.

At the other end of the project area (industrial area), a dry green basin, a transport corridor and two large constructed wetlands have been planned and designed to receive road and site water from the future area of transport and data centers. The basins have a total impoundment volume of 23,000 m3. The wetlands and dike were handed over in summer 2020 and summer 2021 respectively. Rainwater and wastewater management works have also been designed and implemented throughout the project area.

In the residential area, 2 treatment basins have been established. One is a traditional rainwater basin with recreational areas, while the other follows the same design as the Green Street and 10 dry local detention basins with recreational elements, which are designed together with Køge Municipality’s new road through the residential area. All necessary rainwater and wastewater management facilities are completed and handed over in 2022.

Stage 3, which includes the remainder of all the utility’s storm and wastewater facilities in the area, is currently in the design and regulatory phases respectively. It is expected to be tendered with sustainable quality criteria and early contractor involvement during 2023. Finally, planning, hydraulic analysis and design work is ongoing throughout the project area to ensure the best possible coordination with ongoing and future construction work.

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