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

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{{Project overview
 
{{Project overview
 
|Status=In progress
 
|Status=In progress
 +
|Themes=Fisheries, Habitat and biodiversity, Land use management - agriculture, Water quality, Urban
 
|Country=Norway
 
|Country=Norway
 
|Main contact forename=Ingvild
 
|Main contact forename=Ingvild
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|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 info expected soon.
 
|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 info expected soon.
|Project title=Retoration of Grobruelva
+
|Project title=Restoration of Grobruelva
 
}}
 
}}
 
{{Image gallery}}
 
{{Image gallery}}

Revision as of 23:58, 13 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://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). Habitat improving measures are planned, but not conducted yet. More info expected soon.

Monitoring surveys and results

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Lessons learnt

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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
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

Reach length directly affected (m)
Project started 2017/08/01
Works started
Works completed
Project completed 2020/01/01
Total cost category
Total cost (k€) 300
300 k€
300,000 €
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 Ingvild Tandberg
Works and works supervision Vannområdet Ingvild Tandberg
Post-project management and maintenance
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
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
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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