Case study:International recovery of the river Minho: an example of sustainable hydraulic exploitation

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Location: 42° 9' 15.96" N, 8° 11' 42.02" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity, Hydromorphology
Country	Spain
Main contact forename	Maria Luisa
Main contact surname	Prada Hervella
Main contact user ID
Contact organisation	Unión Fenosa Generación
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The situation of the Frieira dam is at about 68 Km from the flow into the river Miño in the Atlantic Ocean and constitutes the first transverse obstacle for the movement of the migratory fish. Until the construction of the dam, it was only crossed by a limited number of eels that were crossed by a small scale of poor efficiency. The rest of the migratory species (Atlantic salmon, sea trout or reo, lamprey, alosa and sábalo) saw their reproductive migration water up stopped, being out of their reach the traditional spawn zones. With the execution of this project it is being trying to correct the environment impact produced by the exploitation of the Frieira installations, reinstituting the free circulation of the migratory fish water up the storage dam; In this way, it has been recuperated for these populations courses of the basin that were used for the reproduction and breeding before the dam construction. This project counts with the support of local, regional, national and European institutions. The financing comes from the LIFE initiative and the Government of Galicia. The total budget is 1.278.875€ (LIFE support 291.342€).

Works included: Installing fish scale of more than 250m.

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Image gallery

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Aerial view of the restoration area

Map of restoration works

Fish lift photograph

Picture of the fishway

Photograph of the duct outlet and the entrance in the reservoir

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district C.H.Minho-Sil River basin Minho Subcatchment River name Minho Area category Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 60-68 m"-68m" is not declared as a valid unit of measurement for this property. Dominant geology Siliceous Ecoregion Ibero-Macaronesian Dominant land cover Waterbody ID Site Edit site Name Escala de peces en la Central Hidoeléctrica de Frieira WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present Species of interest Dominant hydrology Dominant substrate River corridor land use 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 1999/11/01 Works started Works completed 2002/06/01 Project completed Total cost category 1000 - 5000 k€ Total cost (k€) 1278 k€1,278,000 € <br /> Benefit to cost ratio Funding sources LIFE project 291.342€, Galicia Government 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 Unión Fenosa S.A. Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Continuity for organisms Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Creation of fish passes, Improving fish migration 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 Continuity for organisms Yes Yes Yes No change 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 Add. Docs (in Spanish) LIFE Report Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information