Difference between revisions of "Case study:Restoration of Grobruelva"

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|Contact organisation url=http://https://www.vannportalen.no/vannregioner/glomma/vannomrader-glomma/indre-oslofjord-vest/
 
|Contact organisation url=http://https://www.vannportalen.no/vannregioner/glomma/vannomrader-glomma/indre-oslofjord-vest/
 
|Multi-site=No
 
|Multi-site=No
|Project summary=This project aimes to improve the habitat conditions of fast-growing sea trout (salmo trutta) in the Grobruelva river in the Lier municipality (Viken). They are impaired by re-routing of side arms, regulation of the main channel and pollution (roads and agriculture). Habitat improving measures are planned, but not conducted yet. More information is expected soon and will be updated.
+
|Project summary=This project aimes to improve the habitat conditions of fast-growing sea trout (salmo trutta) in the Grobruelva river in the Lier municipality (Viken). They are impaired by re-routing of side arms, regulation of the main channel and pollution (roads and agriculture). First measures to counter pollution have been implemented (new pipe for sewage runoff). Habitat improving measures are planned, but have not been conducted yet. More information is expected soon and will be updated.
 
|Project title=Restoration of Grobruelva
 
|Project title=Restoration of Grobruelva
 
}}
 
}}
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{{Project background
 
{{Project background
 
|Project started=2017/08/01
 
|Project started=2017/08/01
|Works completed=2020/01/01
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|Total cost category=100 - 500 k€
|Total1 cost=300
+
|Total1 cost=350
 
|Funding sources=Land owners, municipality and Norwegian Environmental Agency
 
|Funding sources=Land owners, municipality and Norwegian Environmental Agency
 
|Investigation and design Lead organisation=Vannområdet Indre Oslofjord Vest
 
|Investigation and design Lead organisation=Vannområdet Indre Oslofjord Vest
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|Stakeholder engagement Other contact forename=Ingvild
 
|Stakeholder engagement Other contact forename=Ingvild
 
|Stakeholder engagement Other contact surname=Tandberg
 
|Stakeholder engagement Other contact surname=Tandberg
|Works and supervision Lead organisation=Vannområdet Indre Oslofjord Vest
+
|Works1 and supervision cost category=100 - 500 k€
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|Works and supervision Lead organisation=Vannområdet Indre Oslofjord Vest; For some measures: Lierskogen Vel, Lier municipality and Buskerud JFF
 
|Works and supervision Other contact forename=Ingvild
 
|Works and supervision Other contact forename=Ingvild
 
|Works and supervision Other contact surname=Tandberg
 
|Works and supervision Other contact surname=Tandberg
 
|Post-project management and maintenance Lead organisation=Vannområdet Indre Oslofjord Vest
 
|Post-project management and maintenance Lead organisation=Vannområdet Indre Oslofjord Vest
 +
|Post-project management and maintenance Other contact forename=Ingvild
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|Post-project management and maintenance Other contact surname=Tandberg
 
}}
 
}}
 
{{Motivations
 
{{Motivations
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}}
 
}}
 
{{Measures
 
{{Measures
|Bank and bed modifications measure=information expected soon
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|Bank and bed modifications measure=Installation of gravel habitat (gravel and stones)
|Management interventions=information expected soon
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|Floodplain / River corridor=Removal of retainment structure (Rotubekken), improvement of fish migration (at Sagvollfossen)
 +
|Other technical measure=New pipe for sewage runoff along a side beck of Grobruelva
 +
|Management interventions=Removal of litter (especially car tires)
 
}}
 
}}
 
{{Hydromorphological quality elements header}}
 
{{Hydromorphological quality elements header}}

Latest revision as of 10:00, 14 January 2020

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Location: 59° 49' 7", 10° 20' 16"
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Project overview

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Status In progress
Project web site
Themes Fisheries, Habitat and biodiversity, Land use management - agriculture, Water quality, Urban
Country Norway
Main contact forename Ingvild
Main contact surname Tandberg
Main contact user ID
Contact organisation Vannområde Indre Oslofjord Vest
Contact organisation web site http://http://https://www.vannportalen.no/vannregioner/glomma/vannomrader-glomma/indre-oslofjord-vest/
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
No
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Project summary

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This project aimes to improve the habitat conditions of fast-growing sea trout (salmo trutta) in the Grobruelva river in the Lier municipality (Viken). They are impaired by re-routing of side arms, regulation of the main channel and pollution (roads and agriculture). First measures to counter pollution have been implemented (new pipe for sewage runoff). Habitat improving measures are planned, but have not been conducted yet. More information is expected soon and will be updated.

Monitoring surveys and results

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Lessons learnt

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Image gallery


Grobruelva.jpg
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Catchment and subcatchment



Site

Name Grobruelva
WFD water body codes 009-170-R
WFD (national) typology
WFD water body name Åro watercourse
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body No
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 Intensive agriculture (arable), Urban, Coniferous woodland (semi natural)
Average bankfull channel width category 2 - 5 m
Average bankfull channel width (m)
Average bankfull channel depth category Less than 0.5 m
Average bankfull channel depth (m)
Mean discharge category 1 - 10 m³/s
Mean annual discharge (m3/s)
Average channel gradient category 0.001 - 0.01
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m)
Project started 2017/08/01
Works started
Works completed
Project completed
Total cost category 100 - 500 k€
Total cost (k€) 350
350 k€
350,000 €
Benefit to cost ratio
Funding sources Land owners, municipality and Norwegian Environmental Agency

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design Vannområdet Indre Oslofjord Vest Ingvild Tandberg
Stakeholder engagement and communication Vannområdet Indre Oslofjord Vest Ingvild Tandberg
Works and works supervision 100 - 500 k€ Vannområdet Indre Oslofjord Vest; For some measures: Lierskogen Vel, Lier municipality and Buskerud JFF Ingvild Tandberg
Post-project management and maintenance Vannområdet Indre Oslofjord Vest Ingvild Tandberg
Monitoring



Reasons for river restoration

Mitigation of a pressure Urbanisation, Pollution (eutrophication), River regulation
Hydromorphology Relocation of sidearms, Regulation of main channel
Biology
Physico-chemical Pollution ( e.g. phosphorus, litter )
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Installation of gravel habitat (gravel and stones)
Floodplain / River corridor Removal of retainment structure (Rotubekken), improvement of fish migration (at Sagvollfossen)
Planform / Channel pattern
Other New pipe for sewage runoff along a side beck of Grobruelva
Non-structural measures
Management interventions Removal of litter (especially car tires)
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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