Case study:Restoring sea-trout and salmon habitat in Aurlandselva

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Location: 60° 54' 29.29" N, 7° 11' 23.18" E

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Project overview

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Status	In progress
Project web site
Themes	Environmental flows and water resources, Fisheries, Hydropower, Hydromorphology, Monitoring
Country	Norway
Main contact forename	Bjørn Otto
Main contact surname	Dønnum
Main contact user ID	User:Bod
Contact organisation	E-CO Energy
Contact organisation web site	http://www.e-co.no
Partner organisations	E-CO Energy, UNI Research, NINA
This is a parent project encompassing the following projects

File:Aurlandselva

Project picture

Project summary

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In 1997, 11 weirs have been removed.

In 2003-2009, side channels have been opened.

In 2010, a fishway has been opened.

In 2009-2012, spawning gravel has been introduced.

In 2010-2011, Harrowing has been applied.

Monitoring surveys and results

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E-CO have continuos data from detailed monitoring reaching back to 1988 on fish population (salmon and sea trout). We also have data on the invertebrate community in the river from before the hydro-power development started. There are also physio-chemical data, and continous data on discharge and water temperature. There are also data on the efficiency of the fishway, both for fish migrating up and downstream.

The data will be published in a small summary report at a later stage.

Lessons learnt

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What we have learned so far is the importance of having reliable discharge data, and also the need to target monitoring to measure any specific restoration work being carried out.

Image gallery

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Gravel cover applied in the river (Check link below in "additional links and references" for source).

Fishpass that was created in the river (Check link below in "additional links and references" for source).

Side channels that were connected to the river (Check link below in "additional links and references" for source).

Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present 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 Edit project background Reach length directly affected (m) Project started 1997/01/01 Works started Works completed Project completed 2012/12/31 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 Hydropower Hydromorphology Continuity for organisms, Continuity of sediment transport Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Weir removal, Reopening of side channels, Creation of fish passes, Introduction of spawning gravels Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions 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 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 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 Additional links and references Edit links and references Link Description http://www.yumpu.com/en/document/view/25721128/a-tool-for-solving-res-and-wfd-incompatibilities-bjrn-otto-dnnum-/5 RR a tool for solving RES and WFD incompatabilities Supplementary Information Edit Supplementary Information