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The objective of downstream migration is twofold: firstly, to enable fish to pass downstream of the obstacle and, secondly, to minimise mortality during the passage process.
Downstream migration concerns primarily 3 diadromous species for which this migration is essential to their life cycle: silver eels (adults), Atlantic salmon and sea trout (juveniles (smolts)).
Water intakes and turbines may pose risks to fish fauna during downstream migration. Consequently, power plant facilities should be adapted to address this risk; several downstream migration solutions are possible.
Hydrostadium has carried out the design and construction of several fish-friendly turbines, such as VLH turbines and hydrodynamic screws. These turbines allow downstream migration of fish without mortality, but their installation is subject to certain technical constraints. It is therefore often necessary to implement other downstream migration devices.
A water intake is considered fish-friendly if it makes it possible to:
Hydrostadium provides the design and construction of fish-friendly water intakes and renovates existing screen layouts to bring them into compliance for fish downstream migration.
Hydrostadium can assist you with preparing the application file, sizing calculations and the biological study to ensure good downstream migration.
Access the details of a project by selecting a point on the map.
The Neuville-sur-Ain scheme is located in the eponymous municipality in the Ain department (01). It is located downstream of the EDF Allement dam and upstream of the privately owned Oussiat dam....
The ASASP scheme, commissioned in 1962, is located in the Gave d’Aspe valley, upstream of the municipality of Asasp. The ASASP power plant intake is located in the municipality of Bedous (64) and...
Replacement of the trash rack and creation of a downstream fish passage system comprising 5 outlets with a total flow rate of 1.35 m3/s. Main technical features DN1000 steel downstream fish...
Main technical features 20 mm-spacing fine screen layout, 62 m long, 8-tonne mobile trash rake – automatic raking of the 62 m in 45 minutes, downstream fish passage through the...
Main technical features Fine-bar screen (20 mm spacing) inclined at 26°; 3 downstream passage outlets leading to a trough with a progressively varying cross-section and a civil-engineered...
