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

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Location: 42° 9' 16", -8° 11' 42"
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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
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encompassing the following
projects
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Project picture

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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Lessons learnt

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Image gallery


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
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Catchment and 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

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

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 €
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

Mitigation of a pressure
Hydromorphology Continuity for organisms
Biology
Physico-chemical
Other reasons for the project


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

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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

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Supplementary Information

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