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
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€).

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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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

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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

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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

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

Measures

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Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern	Installing fish scale of more than 250m
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
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Monitoring

Hydromorphological quality elements

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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

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quality elements

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

Physico-chemical quality elements

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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

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

Monitoring documents

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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

Additional documents and videos

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Add. Docs (in Spanish)

LIFE Report

Additional links and references

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Link	Description

Supplementary Information

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