Case study:Ruppoldingen

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Location: 47° 18' 41", 7° 53' 2"
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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


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)
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Catchment and 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

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

Reach length directly affected (m) 1200
1,200 m
1.2 km
120,000 cm
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

Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Building nature-like bypass channel, Creation of fish passes
Floodplain / River corridor
Planform / Channel pattern Creation of fish passes
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
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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

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Supplementary Information

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