Øyer, Flood control

Solution ID
External links
https://phusicos.eu/case_study/valley-of-gudbrandsdalen-norway/
Description of solution
Summary (Challenges; Objectives)

Øyer municipality, just north of Lillehammer, Norway, started a development project to establish 220 family housing units for roughly 500 people in an abandoned gravel pit. However, the project was put on hold due to potential flooding problems and a lack of adequate flood protection. Potential problems in the larger river, Søre Brynsåa River, will mainly be handled by traditional measures, whereas NBS are installed in the Trobekken Creek. The Creek has a flooding problem during heavy precipitation. It has been closed in the lower part and led through a pipe that ends in Søre  Brynsåa west of the houses.

Through the H2020 project PHUSICOS the Trobekken Creek has been opened and re-meandered.  A buffer zone is established around the re-opened creek and is also combined with a sedimentation dam (check dam).

 

Technical characteristics

The implemented NBS measures include re-opening a former piped section of the creek, and re-meander it in an open solution below the houses. A zone around the re-opened creek is established as a buffer zone with retention capacity during flooding, whereas it will appear as a green recreation area in 'normal' periods. In addition, a check-dam have been constructed, and the slopes of the ravine in which the creek flows have been re-vegetated for erosion protection. Two fenced-in test-fields were established to monitor undisturbed re-growth of the natural flora.

Success factors / lessons learnt

Co-benefits:

  • increased sense of safety for the inhabitants along the river.
  • less potential for damage caused by floods
  • re-establishment of vegetation
  • enhance biodiversity
Location Latitude
61.2556000000
Location Longitude
10.4399000000
Keywords
Ecosystem (s) impacted
Rivers
Hazard(s) concerned
Floods
Other challenges
Biodiversity
Climate adaptation
Human well-being/Recreational activities
Ecosystem restoration
Exposition
Exposed assets
Urban or residential areas
Is there population exposed?
Yes, high density of population (>200 persons/km2)
Actors
Organizations involved in the implementation of the action
  • re-opening and meandering the Creek have been implemented through the H2020 project PHUSICOS.
  • plants to use along the creek and in the test-fields were suggested in cooperation with PHUSICOS partner AgenceTer, and was debated between the relevant parties, including the Innlandet County Governor's office to avoid alien species
  • Øyer municipality is responsible for and will carry the costs of maintaining the measures
Temporal aspects
Implementation time of the action
Less than 2 years
Others
Is it possible to transpose this action in a different context?
Yes, it is easily transposable
Pictures
Links

https://phusicos.eu/case_study/valley-of-gudbrandsdalen-norway/

Risk reduction
Hazard
+
Exposure
+
Feasibility
Environment
Water
+
Vegetation
+
Biodiversity
+
Society
Quality of Life
+
Economy