]> 2026-04-12T05:27:48+00:00 Case study:Rheinfelden bypass 500 en DSCN2254.MOV new bypass channel Approved 0.01 - 0.1 10 - 50 m No No No Yes Fish: Abundance,No,No,Yes,Yes,No, Fish: Abundance Yes No No Yes false Rheinfelden map.JPG Rheinfelden fishcounter2.JPG Rheinfelden hydpropowerplant2.JPG Fish path rheinfelden2.jpg Technical fish pass.jpg Rheinfelden natural fishway.JPG The map of Rheinfelden bypass. New power plant designed as run-of-river type. Near-nature water course installed in the old headrace channel. (photo: Walter Binder) Fish counter at the end of Rheinfelden bypass (photo: Pinja Kasvio) Hydropowerplant (photo Pinja Kasvio) Pool fish pass (photo: Pinja Kasvio) Technical fish pass (photo Pinja Kasvio) Nature-like bypass channel for fish (photo Pinja Kasvio). No 47.569917253711,7.8097772598267 Kasvio Walter Binder 10 - 100 m³/s ,, ,,, 5934 The largest bypass for fish in Europe. The bypass is constructed as nature-like IMG 7132.JPG Complete The bypassing water course at the hydropower plant Rheinfelden, on the High Rhine, is the largest fish pass facilitiy of this type in Central Europe. The old hydropower station was a diversion-channel type plant. The new station is a run-of-river power plant. Three fishways are installed, a vertical slot pass at the power house (left bank), the new bypassing river course installed in the old headrace channel(right bank) and a rock cascade pass which connect the tailwater of the weir with the river course. The main intention of this new river course is to provide suitable habitat for rheophilic species, especially spawning grounds for gravel dependent fish species, for example barbel (''Barbus barbus'') and nase(''Chondrostoma nasus''). With a width of 40-50 m, a mean gradient of 0.9 % and a discharge of up to 35 m³s-1 the bypass channel has the character of a mountain river. The mean discharge is 16 m3/s and the attraction flow is 15 m3/s. The aim is to provide a high variety of bottom and flow structures induced by sequences of riffles, bars, pools and single gravel islands. The bed material consists of continuous gravel. In riffles and fast flowing reaches coarser material is provided. A deeper flow path ensures fish passage even at minor discharges. The river banks are characterized by bars, shallow regions, small bays, undercut banks and riparian vegetation. The bypass channel is connected to the weir impoundment with a gentle transition involving several braided channels. The intake structure itself is divided into two sections. One section will be controlled by two gates, the other will be unregulated. The unregulated section will guarantee a constant discharge of 10 m³s-1 in the bypass channel. Additional discharge up to 25 m³s-1 can be provided via the regulated gates in order to provide a dynamic flow regime. The downstream entrance is designed as a rock ramp with a steeper gradient (3%), thus downstream water-level fluctuations are limited to this ramp; i.e. flow characteristics in potential spawning grounds in the bypass channel will not change. The cross-section at the mouth of the channel is narrowed to provide more efficient attraction flow into the tailrace. The total cost of the project was 6 milj. € and the by-pass channel cost 4 milj. €. There is no constant monitoring yet, but they have calculated the amount of the fish in the by-pass channel to be 30 000. In the other fish way the number of fish was 3 000. Rheinfelden bypass rheinfelden bypass No River Rhine at Rheinfelden river rhine at rheinfelden Barbel (Barbus barbus) nase (Chondrostoma nasus) Economic aspects Fisheries Habitat and biodiversity Hydropower Hydromorphology 10000 5000 - 10000 k€ 2013-07-02T13:58:52Z 2456476.0825463 2013-12-09T09:59:47Z 2456635.9165162 Rheinfelden bypass 500 [2,"smw_unitnotallowed","-50"] Rheinfelden bypass# ERR2348e9fa92aca18aab479336512450af