Case study:Wettingen, nature-like fish pass

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Location: 47° 27' 24.77" N, 8° 19' 16.26" E

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Project overview

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Status	Complete
Project web site
Themes	Economic aspects, Fisheries, Hydropower
Country	Switzerland
Main contact forename	Walter
Main contact surname	Binder
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

The nature-like bypass channels middle part has a rock-cascade pass. (photo by Pinja Kasvio)

Project summary

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In Wettingen there is a great example of a small nature-like bypass channel at the weir Wettingen on the Limmat downstream from Zurich which surmounts the very big height of 18.30 m. Nature-like bypass channels total length is 620 m, discharge 0.4 m³/s and additional attraction water is 0.6 m³/s. Total difference in water level is 18.30 m with high mean slope 3 %.The lower section consists of a technical fish. Whereas a near-nature water course was formed in the upper section, a rocky-cascade fishway with a height of 10 meters surmounts the biggest part of the altitude. Due to the limited space the lower section consists of a vertical-slot-pass which is converted into a collection-gallery at the power house. Leading back the water course to the power house is not possiblewhen it comes to bigger bypass channels. Splitting the water into two branches offers a good solution for this small channel. The main branch continues towards the tailwater as a near-nature water course and ends further downstream, where a connection to the natural river bed is possible. The smaller second branch diverts from the main branch towards the power house and is formed as a vertical slot-pass.

The nature-like bypass channel has a trail on its side, so the residents can enjoy the lovely scenery and see some trouts when passing by.

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Image gallery

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Nature-like bypass channel: River Limmat, Wettingen (photo: Walter Binder)

Downstream section of the River Limmat (photo: Walter Binder)

Rock-cascade fish pass on River Limmat (photo:Pinja Kasvio)

River Limmat, hydropowerplant (photo: Pinja Kasvio)

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 Bedrock cascade, Artificial channel 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 Artificially regulated Dominant substrate Bedrock, Gravel River corridor land use Urban, Broadleaf/mixed plantation 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 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 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 Supplementary Information Edit Supplementary Information