Difference between revisions of "Case study:Teglverksdammen"

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|Multi-site=No
 
|Multi-site=No
 
|Project picture=Teglverksdammen TFM.JPG
 
|Project picture=Teglverksdammen TFM.JPG
|Project summary=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.
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|Project summary=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=https://www.vann-nett.no/portal/#/waterbody/006-70-R
 
|Monitoring surveys and results=https://www.vann-nett.no/portal/#/waterbody/006-70-R
|Lessons learn=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)  
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|Lessons learn=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 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)  
+
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 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)  
+
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 still 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.
+
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.
 
|Project title=Teglverksdammen
 
|Project title=Teglverksdammen
 
}}
 
}}

Revision as of 22:18, 13 January 2020

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Location: 59° 55' 24", 10° 47' 47"
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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

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encompassing the following
projects
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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 (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

Edit project overview to modify the Monitoring survey and results.


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

Lessons learnt

Edit project overview to modify the lessons learnt.


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 still 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.


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Catchment and subcatchment



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

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

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

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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

Link Description

Supplementary Information

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