Detached house with rain garden and lawn infiltration (Brøndby 1)
Detached house 1
The owner has opted to manage most of the rainwater on the surface by means of a rain garden and a hollow in the lawn.
The rainwater from the roof area is fed via a concrete trench to a hollow in the lawn in the back garden, where the water infiltrates (photos 1, 2 and 3). The hollow in the lawn is included as a natural part of the garden and is adjacent to a larger plant bed. The garage and toolshed are drained to a soakaway which has an overflow to the lawn. In the front garden, an elongated rain garden has been established along the border (photo 4). A concrete trench feeds the water from part of the roof area along the entrance to the rain garden, where it infiltrates (photo 5). In the case of extreme rainevents, the water will be dammed up on the lawn. A soakaway has been established under part of the rain garden. The remaining part of the roof area is fed first to a rainwater barrel and then in a pipe to the soakaway (photo 6).
The residential road Lindevang in Brøndby Strand forms a starting point for a demonstration project. 15 homeowners have diverted their rainwater from the community sewage system in order to relieve the load on the sewage system with a combination of rainwater gardens, hollows in lawns and soakaways.
The purpose of the project is to develop solutions in respect of civil engineering and regulatory procedures, and also to expand on experience.
This project is part of a collective project in which the road runoff from Lindevang will also be diverted and a Plan B solution for the road and gardens is being examined.
Dimensioning
The project is designed for a 5-year rainwater event. A total of approx. 2,200 m2 of roof surface area has been diverted.
Statement by the contact (advisor/consultant/researcher/producer/utility company/municipality):
"Together with the other initiatives in the area, the project will hopefully allow us to avoid having to extend our sewer systems as much as we would have had to have done otherwise. At the same time, it is reasonable for people to get something out of the rainwater locally instead of sending it all the way here to the waste water treatment plant," says project manager Søren Hansen, Spildevandscenter Avedøre.
Partner
Project owners: Brøndby Kloakforsyning, Spildevandscenter Avedøre and Brøndby Municipality
Advisors: Orbicon and Haveselskabet
Contractors: Per Aarsleff and Lars Voss
See also detached house descriptions 2, 3, 4, 5, 6, 7, 8 and 9.
Photos
