Case study:Environmental restoration of the lower section of the river Narcea in the municipalities of Salas and Pravia (Asturias)

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Project overview

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Status	Complete
Project web site	http://www.chcantabrico.es/index.php?option=com_content&view=article&id=207%3Aproyecto-de-restauracion-fluvial-del-bajo-narcea&catid=124%3Arestauracion-de-rios&Itemid=154&lang=es
Themes
Country	Spain
Main contact forename	Juan Antonio
Main contact surname	Martín Ventura
Main contact user ID
Contact organisation	C.H.Cantábrico
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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Despite its good condition, riparian forests are under human pressure (pipelines, agricultural practices) that have reduced its size and fragmented. The pipelines have altered the natural processes of adjustment of the channels. Narcea River is one of the most important rivers in the North of Spain. The main actions of this project are creating a river corridor and removal of the structures that limit the development of natural geomorphic processes; control of invasive species and ways to improve the composition and extent of riparian forest; actions to mitigate the impact of flooding; and comply with the requirements of the WFD.

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.Cantábrico
River basin	Narcea

Subcatchment

River name	Narcea
Area category
Area (km2)
Maximum altitude category	Less than 100 m
Maximum altitude (m)	50 m0.05 km <br />5,000 cm <br />
Dominant geology	Siliceous, Calcareous
Ecoregion	Ibero-Macaronesian
Dominant land cover
Waterbody ID

Site

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Name	Tramo bajo del río Narcea entre Salas y Pravia
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	Sinuous, Entrenched
Reference morphology	Sinuous
Desired post project morphology
Heavily modified water body
National/international site designation
Local/regional site designations	Site of Community Importance
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	0.003
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	17000 m17 km <br />1,700,000 cm <br />
Project started	2008/01/01
Works started
Works completed
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources	C.H.Cantábrico

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
Post-project management and maintenance
Monitoring

Reasons for river restoration

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Mitigation of a pressure	Flood defence
Hydromorphology	Channel pattern/planform, Structure & condition of riparian zones, Continuity of sediment transport
Biology
Physico-chemical
Other reasons for the project	Recreation

Measures

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Structural measures
Bank/bed modifications	Revetmens with local species, Removal of exotic plants, New bioengineering elements in order to stabilize slope banks
Floodplain / River corridor	Riparian tree planting, Silvicultural treatments
Planform / Channel pattern	Re-instatement of old course (meander)
Other
Non-structural measures
Management interventions	Promotion and management of tourism in the river
Social measures (incl. engagement)	Information panels for people, New pahts near the river
Other

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

Biological quality elements

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quality elements

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Physico-chemical quality elements

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quality elements

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Any other monitoring, e.g. social, economic

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Monitoring documents

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Image gallery

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Aerial view of Narcea River as it passes through Cornellana

Narcea River geomorphological evolution in Vega de Luerces

2006 Aerial photograph of river bars formed in the river Narcea in La Isla channeling, built in 2000.

Erosion of the bank related to the channeling of the river bed

Pictures of riparian vegetation

Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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