Case study:Albbruck-Dogern (bypass and nature-like pool pass)

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Location: 47° 35' 9.30" N, 8° 7' 59.44" 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	Rolf-Jürgen
Main contact surname	Gebler
Main contact user ID	User:Kasvio
Contact organisation	Ingenieurmeinschaft Gruner/Kelag
Contact organisation web site	http://www.radag.de
Partner organisations	Rhein Kraftwerk Allbruck-Gogern AG, Ing. Büro Kesselring
Parent multi-site project
This is a parent project encompassing the following projects	No

The discharge in the bypass is at the moment 5 m3/s that is also the maximum discharge to the near nature bypass (photo:Pinja Kasvio).

Project summary

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The hydroelectric power plant at the High Rhine is designed as a diversion-channel type. The discharge in the River Rhein is at the moment high, 1610 m3/s (1484 m3/s). The discharge to the fish way is always at the minimum 600 l/s (max 800 l/s). In addition to the main power station (Q = 1000 m³/s) a new second power station (Q = 300 m³/s) was installed at the diversion weir to feed the natural river bed with a sufficient discharge. In the course of this project a permanent near-natural running water, with a length of about 900 m and a discharge of 2-5 m³/s has been installed at the left embankment. If the discharge in the river is higher than 1200 m3/s then the max discharge is let to the bypass channel.

The total height of 10.4 m is established by a near-nature water course with a slope of 0.8% and a steeper downstream end. At the upper end the water course is divided into two arms: the rock-cascade-pass (Q = 0.8-3.0 m³/s) leads straight onto the river bed at the left bank. The second arm, designed as a vertical-clot-pass connects the water course with the tailwater of the turbine outlet. Above the turbine outlet a collection gallery with different fish entrances is installed. The total discharge at the outlet varies between 0.6 m³/s and 4.0 m³/s. The height difference in the fish ladder steps are 20–30 cm.

Before the (re)contruction of the plant there was insufficient residual water flow (3‐8 m3/s) due to the diversion, section for the existing power plant “Albbruck Dogern”, interrupted continuum by river weir, interrupted fish migration, low fish population and low population of aquatic fauna. After the contruction work of the plant there has been immediate increase of the residual water flow: 3.8 m3/s to 40 m3/s; from the 1st January 2008 up to 70‐100 m3/s. Creation of a nature like fish ladder with collection gallery, renaturing of former gravel islands, upvaluation of a birdisland. New weir‐power plant extension uses in operation a water flow of min. 200 m3/s. Implementation of the ecological measures lasted until year 2012. Hydromorfological improvements concerned the connection of the sidewater Alb to the Rhine, creation of a nature like bed structure in the diversion with gravelbars and ecological improvements in the whole area of the river diversion and in the river course under the weir. Also there was ecological improvements of the ecological diversity of the shoreline. Now many migratory fish uses the bypass channel. For example the grayling spawns in the bypass channel.Also the area is open for the residents to walk along the channel. The new chanel is also very attractive for birds and insects.

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Image gallery

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River Rhine, Albruck / Dogern (D): Diversion of the discharge into two courses: rock cascade pass, vertical slot pass with collection gallery.

The end of the fish pass - the vertical slot and the fish way (photo: Pinja Kasvio)

The bypass channel (photo Pinja Kasvio)

Added wood material (photo: Pinja Kasvio)

The start of the technical fish pass (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 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 Urban Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category more than 1000 m³/s Mean annual discharge (m3/s) 1610 m3/s1,610,000 l/s <br /> Average channel gradient category Average channel gradient Average unit stream power (W/m2) New 300, old 1100 "New" is not declared as a valid unit of measurement for this property. Project background Edit project background Reach length directly affected (m) 900900 m <br />0.9 km <br />90,000 cm <br /> Project started 2008/01/01 Works started Works completed 2012/07/01 Project completed 2012/07/01 Total cost category more than 10000 k€ Total cost (k€) 4 milj €"milj€" is not declared as a valid unit of measurement for this property. 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 Flow velocities Biology Fish: Abundance Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Creation of fish ladders Floodplain / River corridor Creation of side channel 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 NEar nature water courses at hydropower stations PLANTS AS FISHWAYS AND RUNNING WATER HABITATS Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information