Case study:Ruppoldingen

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Project overview

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Status	Complete
Project web site
Themes	Hydropower
Country	Switzerland
Main contact forename	nick
Main contact surname	elbourne
Main contact user ID
Contact organisation
Contact organisation web site
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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A natural fish pass was constructed on the river Aar at the Ruppoldingen hydropower plant. The aim was to mitigate the impacts of the hydropower plant, allowing free fish migration and compensate for loss of habitats. The scheme was two-fold. Firstly a 155 meter long natural fish pass close to the turbines. A second 1.2km long bypass channel was also created further downstream of the plant. This channel comprised two arms, one which was shallower with gravel riffles installed and a deeper channel for migration. The aim was to re-create a natural alpine stream. The mean gradient of the fish pass is 3.8%, and the bypass channel 0.4%. Pike, Carp, Barbell and Catfish have been seen to use the bypass channel. Juvenile Grayling have also been found, suggesting that the bypass channel is providing a new reproductive area.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Catchment

River basin district	Rhine
River basin	Rhine

Subcatchment

River name	Rhine
Area category	1000 - 10000 km²
Area (km2)
Maximum altitude category	1000 - 2000 m
Maximum altitude (m)
Dominant geology	Siliceous
Ecoregion	Central Plains
Dominant land cover	Grassland, Urban
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Other case studies in this subcatchment: Amerongse Bovenpolder, Bakenhof Dyke reconstruction, Blauwe Kamer, Room for the River, Upper Main catchment restoration

Site

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Name	Aar at Ruppoldingen
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WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology	Pool-riffle
Desired post project morphology
Heavily modified water body	No
National/international site designation
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Protected species present	No
Invasive species present	No
Species of interest
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Dominant substrate
River corridor land use	Improved/semi-improved grassland/pasture, Broadleaf/mixed woodland (semi natural)
Average bankfull channel width category
Average bankfull channel width (m)
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Project background

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Reasons for river restoration

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Mitigation of a pressure
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Measures

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Monitoring

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quality elements

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