Case study:River restoration project in Sella, Asturias

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Location: 43° 24' 36.13" N, 5° 5' 57.12" W

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Project overview

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Status	Complete
Project web site
Themes
Country	Spain
Main contact forename	MARM
Main contact surname	MARM
Main contact user ID
Contact organisation	MARM
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 lower Sella has a condition considered the best in the territorial scope of the Hydrographic Confederation of Cantabrian but presents problems of morphological alteration, degradation of riparian vegetation and recreational pressure The main objectives of this project are: Recover fluvial processes with which the river can rebuild a more dynamic and natural flow; Make the river increase their resilience to natural or human disturbances, defined as the ability to recover its natural state after a disturbance of natural and/or human; Encourage the creation of a sustainable structure and compatible land uses and river resources agreed by the society; Recover the beauty of the river and its banks, as well as the emotional relationship between man and his land and river landscape; 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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(affects all case studies in this subcatchment)

Catchment

River basin district	C.H.Cantábrico
River basin	Sella

Subcatchment

River name	Sella
Area category
Area (km2)
Maximum altitude category	100 - 200 m
Maximum altitude (m)
Dominant geology	Siliceous
Ecoregion	Ibero-Macaronesian
Dominant land cover
Waterbody ID

Site

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Name	Tramo bajo del Sella
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	Sinuous
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	Urban
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)	19500 m19.5 km <br />1,950,000 cm <br />
Project started	2009/01/01
Works started
Works completed
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources	MARM

Cost for project phases

Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
Investigation and design
Stakeholder engagement and communication			C.H.Cantábrico
Works and works supervision
Post-project management and maintenance
Monitoring

Reasons for river restoration

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

Measures

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Structural measures
Bank/bed modifications	Remove rip-raps, Revetmens with local species, New bioengineering elements in order to stabilize slope banks
Floodplain / River corridor	Removal of sediments, Removal of exotic plants
Planform / Channel pattern	Remove obstacles in the riverbed
Other
Non-structural measures
Management interventions	Promotion and management of tourism in the river
Social measures (incl. engagement)	Citizen participation in the restoration project
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

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 Sella River downstream Arriondas

Map of the restoration area

Defensive structure dismantled in Santianes del Terrón

Unnatural fillings on the left bank of Triongo River

Eroded reach in the fertile plain of Intrialgo River, threatening railroad tracks

Remains of old walkway

Colonization of degraded banks by invasive species (Japanese bamboo)

Remains of Vejal dam

Additional documents and videos

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Add. docs. (in Spanish)

Social involvement document

Additional links and references

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Link	Description

Supplementary Information

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