Detached house with rain garden infiltration (Brøndby 5)
The owner has chosen to manage most of the surface rainwater in one new and one existing rain garden.
The rainwater from one half of the roof area towards the road is fed via a concrete trench to a rain garden in the front garden, where the water infiltrates to an underlying soakaway (photos 1, 2, 3 and 4). The rain garden is positioned towards the road. All drainpipes are made of copper (photo 10). The other half of the rainwater is fed via a concrete trench to the road, where the trench is buried in the existing surface (photos 5 and 6).
In the back garden, the rainwater from most of the roof area at the back of the house is fed to a soakaway with an overflow to the lawn. The remaining amount of rainwater is fed via a concrete trench to infiltration in a natural hollow in the lawn (photos 7, 8, 9 and 10). The trench is positioned so that it blends into the existing surfacing along the house. The hollow has been manufactured by ramming so that the hollow can dam more water under extreme rainevents.
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 1, 2, 3, 4, 6, 7, 8 and 9.
Photos
