Case study:Ruppoldingen

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Location: 47° 18' 40.69" N, 7° 53' 1.70" E

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Project overview

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Status	Complete
Project web site
Themes	Hydropower
Country	Switzerland
Main contact forename	Rolf-Jürgen
Main contact surname	Gebler
Main contact user ID	User:Kasvio
Contact organisation	Alpiq
Contact organisation web site	http://www.alpiq.com
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

The rock-cascade fishpass. (photo by Pinja Kasvio)

Project summary

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Ruppoldingen in the River Aare is a good example of a combination of a long bypass channel with reproduction habitats and a fish pass near to the power plant. The bypass was constructed in 2001 during the renewal of the power plant at the place of the old headrace channel. The planning and construction of the bypass at Ruppoldingen served as the first example to gain experience for similar constuctions in other power plants and especially for the large facilities in Rheinfelden.

In Ruppoldingen, the aim was to mitigate the impacts of the hydropower plant, allowing free fish migration and compensate for loss of habitats and also to design a small river that creates habitats for the fish that are typical for the area. The scheme was two-fold. Firstly a 155 meter long natural fish pass close to the turbines. The mean gradient of the fish pass is 3.8%. A second length was also created further downstream of the plant as the bypass that is 1,2 km and mean gradient 0,5%. 2-5 m3/s is lead to the bypass channel as environmental flow. A rock cascade fish pass connects the bypass to the power 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.

According to monitoring, juveniles of greyling have been found in the bypass channel and big fish species like pike, carp, barbell and wells catfish have used it. These suggests that the bypass channel is providing a new reproductive area. By the measures at Ruppoldingen the power company Alpiq has got the Naturemade Star -certification which is considered to be the most demanding Green Electricity Certification for hydropower.

Monitoring surveys and results

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According to monitoring, juveniles of greyling have been found in the bypass channel and big fish species like pike, carp, barbell and wells catfish have used it. These suggests that the bypass channel is providing a new reproductive area.

Lessons learnt

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Image gallery

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The map and plan of Ruppoldingen fishpass.

Nature-like bypass channel for fish (photo Pinja Kasvio).

Rock cascade fish pass (photo Pinja Kasvio)

Duck in the nature-like bypass channel (photo Pinja Kasvio)

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) 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 Waterbody ID Other case studies in this subcatchment: Amerongse Bovenpolder, Bakenhof Dyke reconstruction, Blauwe Kamer, Room for the River, Upper Main catchment restoration Site Edit site Name River Aar at Ruppoldingen WFD water body codes 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 Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology 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) 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) 12001,200 m <br />1.2 km <br />120,000 cm <br /> Project started Works started Works completed Project completed 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 Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Fish pass, Building nature-like bypass channel Floodplain / River corridor Planform / Channel pattern Establishment of fish passage 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 Supplementary Information Edit Supplementary Information