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

Lower stretches of the opened stream channel before the main pond in Teglverksdammen, the first full summer season - 2016. Source: Therese Fosholt Moe / NIVA (Norwegian Institute for Water Research)

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 (Ensjø) was to be transformed from an industrialized area to a new residential area. The Tegiverksdammen consists of a stretch of riffles and pools, followed by a large 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 still directed to the original culvert, to prevent flooding of the system. The water quality is typical of urban streams, with high nutrient levels and organic load.

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 the first year after opening, colonization of invertebrates mainly appeared to be from species drifting from upstream, rather than (except 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, were a mixture of diatoms (mostly early spring and late fall), green algae and cyanobacteria. The main pond (Tegiverksdammen) had an 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 a high production of benthic cyanobacteria, which broke off and flowed massively into the main pond as brown-black lumps on the surface. Whether these were temporary conditions due to the recent opening of the facility, or simply an effect of low water flows and depths remains to be seen. (Refer here to Karoline Dahl Myrstad's Master's thesis)

Due to maintenance requirements during the first summer after opening, the flow of water was shut down for approximately one month. During this period, the pools and ponds had stationary 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 during 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 whether the water was flowing and on the nutrient concentrations of the water entering the system.

Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Teglverksdammen WFD water body codes 006-70-R WFD (national) typology REL1411 WFD water body name Hovinbekken nedstrøms Økern Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Dominant substrate River corridor land use Urban Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category 0.1 - 1.0 m³/s 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 2013/01/01 Works started Works completed Project completed 2016/01/01 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 Urbanisation, Flood risk management Hydromorphology Continuity for organisms Biology Fish, Invertebrates Physico-chemical Nutrient concentrations, Specific non-synthetic pollutants Other reasons for the project Landscape enhancement, Recreation Measures Edit Measures Structural measures Bank/bed modifications Reopening of culverted river, Habitat restoration, habitat creation, Creation of pools and riffles, Sediment trap building Floodplain / River corridor Planform / Channel pattern Creation of pools and riffles, Creation of pond Other Non-structural measures Management interventions Reduced pollution 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 Invertebrates No Yes No Yes Yes Improvement Phytoplankton No Yes No Yes No Improvement Macrophytes and/or phytobenthos: Taxonomic composition No Yes No Yes Yes Improvement Macrophytes and/or phytobenthos: Average abundance No Yes No Yes Yes Improvement 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 Nutrient concentrations No Yes No Yes Yes Inconclusive 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 Master Thesis Burgess 2018: Development in Phytoplankton Assemblages, Ecological Status and Purification Effect in Teglverksdammen Master Thesis Dahl Myrstad 2017: Colonisation and Growth of Benthic Algae in a Recently Deculverted Urban Stream Master Thesis Arnott 2017: Macroinvertebrate colonisation of a recently deculverted urban stream Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information