Difference between revisions of "Case study:Habitat measures in Strynevassdraget"

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|Result=Awaiting results
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Revision as of 16:47, 2 December 2019

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Location: 61° 54' 57", 6° 45' 50"
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Project overview

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Status Complete
Project web site
Themes Habitat and biodiversity, Hydromorphology
Country Norway
Main contact forename Anders Jarle
Main contact surname Muldsvor
Main contact user ID
Contact organisation The Norwegian Water Resources and Energy Directorate (NVE)
Contact organisation web site http://www.nve.no
Partner organisations Stryn municipality, Stryn elveeigarlag, County Governor of Vestland, Vestland County Council, The Norwegian Public Roads Administration, The Norwegian Coastal Administration, Norwegian Food Safety Authority, Utmarksressurs AS
Parent multi-site project
This is a parent project
encompassing the following
projects
No
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Project summary

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The measures conducted are based on a management plan for the River Basin District Vestlandet (period: 2010-2015) and initiated through the measure’s proposal "Heilskapeleg tiltaksplan for Strynevassdraget" prepared by Utmarksressurs AS. The management plan was drawn up to improve the water quality in the watercourse according to requirements in the Water Management Regulations (Vannfirskriften). The environmental objectives for Strynevassdraget was to improve the ecological conditions in the main river, which was considered deficient.

A project lead by NVE (Norwegian Water Resources and Energy Directorate) in collaboration with Stryn Elveeigarlag and Stryn municipality, was started in 2016 where the highest priority measures were implemented. NVE finalized these measures in the fall of 2017. The measures were aimed at increasing the ecological value of the Strynevassdraget as a waterbody, by opening old streams and ox-bow lakes, creating shelters and habitats for fish, insects and ducks in both the riverbed and along the cultivated land by the riverbanks.

The measures include:

• Opening of old streams and ox-bow lakes

• Habitat improvement measures

• Removal of migration berries for fish

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment



Site

Name Stryneelva
WFD water body codes 088-29-R and 088-13-R
WFD (national) typology RWL2241 and RWL2811
WFD water body name Stryneelva and Sideelver til Stryneelva
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body No
National/international site designation
Local/regional site designations National Salmon Watercourse
Protected species present Yes
Invasive species present No
Species of interest Salmon and Sea-trout
Dominant hydrology Estuary
Dominant substrate
River corridor land use Intensive agriculture (arable), Urban
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 2010/01/01
Works started
Works completed
Project completed 2018/01/01
Total cost category
Total cost (k€) 119
119 k€
119,000 €
Benefit to cost ratio
Funding sources The Norwegian Water Resources and Energy Directorate (NVE), Stryn municipality, Stryn elveeigarlag

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 Barriers to fish migration, Land drainage, Riparian development, Flood risk management
Hydromorphology
Biology Fish, Invertebrates
Physico-chemical
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
Fish Yes Yes No No No Awaiting results
Invertebrates Yes No No No No

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
http://www.vannportalen.no/globalassets/vannregioner/rogaland/rogaland---dokumenter/publikasjoner/rapporter/heilskapleg-tiltaksplan-for-strynevassdraget.pdf Measures plan
http://www.facebook.com/stryn.kommune/videos/strynevassdraget-er-blitt-rikare-p%C3%A5-b%C3%A5de-fugl-og-fisk/1237244539731489/ Video

Supplementary Information

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