Case study:Teglverksdammen

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Location: 59° 55' 24.23" N, 10° 47' 47.14" E

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Project overview

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Status	Complete
Project web site
Themes	Economic aspects, Flood risk management, Habitat and biodiversity, Hydromorphology, Monitoring, Social benefits, Spatial planning, Water quality, Urban
Country	Norway
Main contact forename	Agency of Urban Environment (temporary)
Main contact surname	Oslo municipality (temporary)
Main contact user ID
Contact organisation	Oslo municipality
Contact organisation web site	http://www.oslo.kommune.no
Partner organisations
Parent multi-site project	Case_study:Reopening and restoration of the stream Hovinbekken
This is a parent project encompassing the following projects	No

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Project summary

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The Teglverksdammen is a reach of the stream Hovinbekken which opened in 2015. The project was initiated to improve the water quality downstream, as the downstream area (Ensje) was to be transformed from an industrialized area to a new apartment center. The Tegiverksdammen consists of a stretch of riffles and pools, followed by the major pond (called Teglverksdammen), a short river stretch (to become a wetland) and a final pond for sedimentation. After the final pond (Grensedammen), the river flows into the Ensjø area. The water in this system originates from an 800 m culvert, and part of the flow is redirected to the original culvert, to prevent overflooding of the system. The water quality is typical of urban streams, i.e. high on nutrient and organic waste input.

Monitoring surveys and results

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https://www.vann-nett.no/portal/#/waterbody/006-70-R

Lessons learnt

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Based on studies of colonization of macroinvertebrates the first year after opening we found that colonization has drifted from species upstream of the culvert, and not (or perhaps to a very small extent) from the other Oslo streams. (Refer to David Arnott's master thesis here)

Benthic algae the first two years after opening the streams were a mixture of diatoms (most early spring and late fall), green algae and cyanobacteria. The main pond (Tegiverksdammen) had extensive growth of filamentous green algae (Spirogyra) during the warm summer months, which also flourished after mechanical removal in July. The shallow parts of the upper stream reach also had high production of benthic cyanobacteria, which broke off and flowed massively into the main pond as brown-black lumps on the surface. Whether these are temporary conditions due to the recent opening of the facility, or simply an effect of low water flow and depth remains to be seen. (Refer here to Karoline Dahl Myrstad's Master's thesis)

Due to maintenance needs the first summer after opening, the flow of water was shut down approximately one month. During this period, the pools and ponds had still-standing water, while the riffles dried out. The result of this was a massive increase in phytoplankton biomass in the main pond (Teglverksdammen). Other than that, biodiversity did not change significantly between the first two full years after the facility opened. (Refer here to Susanna Birgitta Diana Burgess's Master's thesis)

Monitoring of water chemistry at the inlet and outlet of the system the first two summer seasons after opening showed the potential of the facility for some purification of the water, but it was partly dependent on time of year, on the water actually flowing and on the nutrient concentration of the water entering the system.

Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present Species of interest Dominant hydrology Dominant substrate River corridor land use Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information